Environment, Prehistory & Archaeology of Mount Rainier National Park, Washington
Ecological Maturity, Resource Abundance and the Northwest Maritime Forest
Due to similar latitude and position relative to Pacific westerlies, the Cascades share general climate and environmental patterns. The Coast Range, Puget Trough, Olympics and Cascades are exposed to a relatively mild, seasonally wet maritime climate along the foothills and western slopes. As Pacific air masses flow over the high Cascades and down the eastern slope, adiabatic warming increases moisture holding capacity and induces the drier climatic regimes characteristic of the Columbia Plateau.
In direct response to moist, relatively stable climatic conditions, the greater northwest maritime region tends toward states of high ecological maturity; that is, toward generally dense, stable forest cover. While not alluding to maturity directly, Heusser (1983:241), citing Waring and Franklin (1979), emphasizes this effect for the Pacific Northwest.
In a natural state, dense hemlock and fir forests carpet much the region from the Puget Trough, to the eastern slopes of the southern Washington Cascades. Though specific plant communities vary in response to micro-climate and sediment differences, and especially to forest perturbation (lahars, winds and fires), the general tendency is toward mature, wet forest conditions up to about 5,500 ft above sea level near Mount Rainier. I refer to this mature forest pattern as the Northwest Maritime Forest (see Burtchard and Keeler 1991:17-32). At higher elevations, Pacific Maritime Forests give way to subalpine parkland, alpine tundra, and, on the highest peaks, to glacial snowpack and rubble. On the eastern slope, maritime fir forests grade to more xeric interior pine stands and ultimately to the shrub steppe of the Columbia Plateau.
Forest maturity patterns are important because they are linked to the distribution and abundance of edible plant and animal resources in the maritime Northwest. In a mature or late successional state, Northwest Maritime Forests are difficult places to live. Food sources are limited by the tendency of uniform, high maturity forests to lock up most of their energy and nutrient budget in standing biomass (principally cellulose). A relatively small percentage goes to edible foliage or reproductive parts (see Pianka 1974:89-90; Odum 1971:385; and Whittacker 1975:137).  Edible biomass is highest not in the forest proper, but in lower maturity subalpine parkland and alpine tundra associations above the forest line, or at other places where forest cover has been reduced temporarily by fire, landslides, lahars or other sources of disturbance. Consequently, in the Cascades and on Mount Rainier, the most productive habitats over the long term are alpine grasslands, patchy subalpine forest, open wet meadow associations, and patchy interior pine forests (not represented in the Park). Disturbance related low maturity areas are productive as well, but tend to be temporary; closing as the maritime forest regenerates. Laced through this general pattern are salmon bearing rivers and tributary streams locally capable of sustaining intensive human use given sufficient need and labor to meet extraction and storage demands.
In short, high maturity tendencies of the Pacific Maritime Forest tend to suppress food resources necessary to sustain prehistoric populations. In order to maximize access to seasonally available game and edible plants, successful groups were obliged to focus their activities toward lower maturity or earlier succession zones regardless of cultural affiliation or idiosyncratic preferences (i.e., toward open to patchy habitats however they were created and maintained). Accordingly, the key to understanding patterned prehistoric use of Mount Rainier, lies in large measure in our ability to understand the distribution of low to higher maturity habitats within the general forest regime. The following sections address this issue.
Several taxonomic systems have been devised to characterize forest or plant associations in the Pacific Northwest. The earliest widely applied system characterized forest constituents in terms of south to north latitudinal patterns for the North American continent; keyed to roughly comparable elevation zones on Mount Rainier. In their manuals on Mount Rainier flora and fauna, Brockman (1947) and Taylor and Shaw (1927) used this system to distinguish Humid Transition and Canadian, Hudsonian subalpine forest, and Arctic-Alpine snowfield and tundra zones for the Park. Even though the system oversimplifies local variability, it nonetheless provided useful distinctions between modal plant and animal communities that result from elevationally induced variation in growing season and snowpack.
Perhaps the best known environmental taxonomy for Oregon and Washington was developed by Franklin and Dyrness (1973). Because of its descriptive rigor and applicability to varied settings, this work has become the de facto standard for archaeologically-related environmental descriptions in the Northwest. Franklin and Dyrness' system improves on earlier continental zones by emphasizing combined effects of physiography, climate, and sediment structure to map climax plant associations. For the southern Washington Cascades and Mount Rainier, climax forest zones include 1) Tsuga heterophyla (western hemlock) forest at lowest elevations; grading to 2) Abies amabilis (Pacific silver fir) associations on intermediate slopes; and 3) Tsuga mertensiana (mountain hemlock) forests above 1,250 m (4,100 ft). Mountain hemlock associations become increasingly patchy toward timberline until dominated more by subalpine meadow grasses, sedges and composite flowers than by trees. Fully alpine tundra grasslands are situated between timberline and permanent snowfields above circa 8,000 ft. As will be seen, the system used in the present report builds on Franklin and Dyrness' scheme by grouping Tsuga heterophyla through lower Tsuga mertensiana forests into the single Northwest Maritime Forest class that emphasizes their shared tendency toward high maturity.
In Vegetational History of the Northwestern United States, Heusser (1983:243) models forest associations from the Puget Trough to the crest of the southern Washington Cascades near Mount Rainier. He emulates Franklin and Dyrness' distinctions but couches them in terms more easily recognized as forest/landscape types. Heusser's model (Figure 2.4) is included below because of its similarity to environmental distinctions used here, and because it simulates a mountain profile, drawing attention to the effects of decreasing temperature on key vegetation constituents. Modifications are indicated in brackets.
The most thorough consideration of forest association patterns for the immediate project area is Franklin et al.'s (1988) The Forest Communities of Mount Rainier National Park. The authors identify a mosaic of climax associations keyed to four Park quadrants and associated river systems. Elevation and moisture related variability in floral composition and understory dominants are used to provide a more realistic picture of plant associations in various parts of the Park. Importantly, the authors move beyond the three-part high maturity/climax plant association system to consider maturity reducing impacts of major fires, avalanches and lahars. Figure 2.5 is a simplified mosaic of Mount Rainier National Park habitat types as affected by temperature (i.e., elevation) and precipitation (primarily windward versus leeward position on the mountain). It provides a notion of the complexity that underlies simpler forest constructions; and draws attention to an important food resource Vaccinium as an understory constituent and seral dominant when Abies amabilis forests are disturbed by fire (see the ABAM/VAAL association in Figure 2.5). Interested readers should refer the complete volume (see also Moir 1989) for detailed consideration of Mount Rainier floral associations.
Useful as it is for developing a thorough understanding of Mount Rainier forest ecology, the Franklin et al. (1988) study is unnecessarily complex for present purposes. The most salient issues are those that address relative forest maturity, distribution and abundance of food resources, and factors that alter the forest's maturity/resource balance. It already has been emphasized that in general 1) Northwest Maritime Forests tend toward high maturity; 2) variety and abundance of game and edible plant resources tend to vary inversely with maturity; 3) maturity decreases in a more or less regular, predictable fashion with elevation, maximizing food resource abundance in subalpine and lower alpine habitats; and 4) maturity is reduced in an irregular, less predictable fashion in response to large fires and other forest disturbing phenomena. To accommodate these considerations, the system outlined below isolates five environmental zones that includes three major plant associations keyed to variable maturity and resource distribution patterns; a low elevation river valley subzone; and high elevation glacier/ permanent snowfield category. The maturity reducing effect of fire on forest habitats is discussed as well.
Table 2.2 correlates the present taxonomy with those outlined above. Franklin et al.'s (1988:64-75) modal forest ecosystem structure is used to represent their more elaborate mosaic system. Please note that elevation breaks between all zones are approximate. Boundaries typically are more gradual than shown and vary locally with precipitation, exposure, sediment structure and so on. Alternating gray and white bands indicates zonal concordance to the system used here.
Table 2.2 Mount Rainier Environmental Zonation Systems
Low to Mid-Elevation Forest
Low elevation western hemlock forests grade into mid-elevation associations dominated by Pacific silver fir (Abies amabilis) at about 3,000 to 3,500 ft in the southern Washington Cascades. Silver fir associations are the Park's primary forest type up to circa 4,000 to 4,500 ft. This is the heart of Franklin et al.'s (1988) silver fir/Alaska huckleberry (ABAM/VAAL) and other Abies amabilis associations shown on Figure 2.5. Though dominated by silver fir, forest constituents vary widely with exposure and age. Other common tree species include western hemlock, noble fir (abies procera), Douglas fir, western red cedar (Thuja plicatawet sides), and western white pine (Pinus monticola). Aside from Vaccinium, locally dominant understory constituents include Oregon grape (Berberis nervosa) and salal (Gaultheria shallon) on the dry side; and devilsclub (Oplopanax horridum) and skunk cabbage (Lysichitum americanum) in wetter areas.
Upper Elevation Forest
Of the larger animals, black-tailed deer are present in the forest were adequate browse is available, particularly at meadow fringes. However, both deer and elk (presumed to be present prehistorically) "during the summer months ...seek the higher levels of the park, where open spaces afford more sunlight and grass. They [deer] are especially fond of burns, where the thick vegetation provides an abundance of browse" (Taylor and Shaw 1927:118). Similar considerations apply to black bear. Marmots, goats and large birds (grouse and especially ptarmigan) tend to frequent higher elevation subalpine to alpine landscapes.
It is interesting and, from a prehistoric hunter's point of view, important to note that the most abundant mid-forest animal species are relatively small birds and mammals. Even though more economically useful larger game is present where browse permits, over the long run, most successful hunters would have followed their prey through the forest into more open subalpine and alpine settings at higher elevation.
The Huckleberry Issue
Because of its edible resource qualities and because deer, bears and birds are attracted to productive huckleberry grounds, Vaccinium may have been important to prehistoric foraging strategies. Indeed, during early historic times, huckleberry collection appears to have been the primary reason Indian groups came to Mount Rainier (Smith 1964:155). The most important varieties reported by Smith (1964:157-163) were oval-leaf (probably including Alaska) and big-leaf huckleberries in midelevation forests; and low growing dwarf huckleberries at higher elevation. Among other things, Smith goes on to discuss huckleberry drying techniques on mats and elevated racks; popular collecting grounds; the practice of setting fires to enhance huckleberry production; and packaging for downslope transport. At several points he notes the use of horse transport and coordination of berry collecting with hunting activities.
In my opinion, it is doubtful that the nutrient or caloric value of huckleberries was sufficient to overcome distance and bulk transport difficulties associated with mass harvest prior to introduction of the horse circa A.D. 1700. There is no doubt, however, that the resource was used extensively by small collecting parties emanating from various tribal groups on all sides of the mountain thereafter (see Smith 1964:149-179). Furthermore, given its history of repeated burns prior to modern fire suppression (Franklin et al. 1988:149-158), Mount Rainier could have supported substantial huckleberry habitat at ostensibly resource poor maritime forest elevations. For now, it must be recognized that burned and excessively drained mid-elevation habitats may have produced floral and faunal resources sufficient to attract significant human use in the past. The extent to which such use extended into the prehistoric past depends on the direct value of these berries as food plus the value of game co-occurring at midelevation berry grounds, compared to resources found at higher-elevation habitats. I suggest that despite presence of mid-elevation huckleberry habitat, the greater stability and overall higher productivity of subalpine habitats would consistently have attracted greater human use over longer stretches of time. If so, most of the Park's prehistoric archaeological record should be located in subalpine and alpine habitats with a lower frequency elsewhere.
In a sense, rivers and associated floodplains are not a distinct environmental zone per se, but rather are more characteristic of maritime forest stands near sea level. This is generally true of the Park's lowest major floodplainsparticularly the Carbon, Nisqually and Ohanapecosh Rivers in the Park's northwest, southwest and southeast corners. Brockman (1947:3) enthusiastically describes the Park's lower riverine forest in his Humid Transition Zone introduction as
Lahars and Floods
Lahars represent the most spectacular destructive events to impact Mount Rainier's low elevation riverine environments. Effects of major Mount Rainier mud and debris flows such as the 5,000 year old Osceola and 500 year old Electron mud flows are well known. Lesser flows are destructive on a smaller scale, and are far more common. Because of its relief, heavy rainfall and geological youth, many of Mount Rainier's rivers and streams are subject to periodic disruption, particularly in upper to mid-level drainages (see Crandell and Mullineaux 1967, and Scott et al. 1995). Such events repress forest maturity, temporarily opening affected floodplains to more productive early succession plant and animal associations. Even in the absence of such spectacular events, high energy seasonal runoff on major riverssuch as that shown in Figure 2.6 on the Carbon Riverare capable of altering river courses and transporting boulder-sized rock substantial distances, and in so doing, keep the forest fringe at bay.
Combining information above with maps showing spawning areas (Fulton 1968, 1970) and major upstream impediments (Williams et al. 1975), it is possible to reconstruct roughly the extent to which spawning salmon physically could have entered Mount Rainier rivers. Figure 2.7 shows river systems and approximate upstream limits of unimpeded salmon migration. Rivers not highlighted have major cascades or falls that effectively preclude upstream migration well below Park boundaries. Please note that this projection should be considered a working model to be improved as more information is made available.
Randall Schalk (pers. com. 1996) has studied Fulton and Williams map data, and offers these observations:
It is important to recognize that, because of extensive habitat alteration, present fishery data are not good indicators of prehistoric presence or abundance. We have emphasized the position of upstream barriers to attempt to show maximum possible migration routes. Unfortunately, we cannot reconstruct specific upstream migration patterns or seasonality with precision. Even so, it unlikely that salmon were ever a major resource in the Park. Periodic floods and debris flows temporarily, but repeatedly, must have diminished anadromous fish habitat. Perhaps more important is the high energy, silt-laden character of the near mountain river systems. According to Schalk (pers. com. 1996):
Floodplain Archaeology and Land-Use
Even so, there is reason to believe that river floors were not a major element of Mount Rainier's prehistoric resource base. The river valley landscapes experience resource limitations common to maritime forests generally. Indeed, because Mount Rainier's river valleys are too low for productive huckleberry habitat (at least for commonly collected varieties), too narrow for extensive ungulate habitat and too silty and lahar prone for productive anadromous fisheries, their usefulness to prehistoric populations may have been more for access to Mount Rainier itself, rather than for resources offered directly.
Up from the floodplains and above the maritime forest, dense forest cover gives way to clumped tree groups scattered among meadow communities. Sometimes referred to as the forest/tundra ecotone (Franklin and Dyrness 1973:248), these subalpine parklands typically appear as patchy associations of conifers interspersed with grassy meadowlands sandwiched between closed forest below and open tundra above. Because of high resource potential, and because they compromises distance between tundra and forest ecozones, I suggest that Mount Rainier's subalpine parklands are the most important places for focused seasonal human use during the prehistoric pastclearly not the only places, but the most intensively and repeatedly used over the long-term.
The subalpine zone's enhanced productivity lies in the maturity suppressing effect of heavy snowpack and short growing season. Under such circumstances, rapidly growing and reproducing species such as grasses, sedges, composite flowers, low shrubs, and plants with underground bulbs have an advantage over slower growing, longer-lived trees. Rapid growth plants also provide the best forage for ungulates as well as smaller mammals and birds. Locally dense dwarf huckleberries are good bear and bird habitat and can be exploited directly by humans. Subalpine parklands offer an effective compromise between closed forest and open spacemeadows provide a good source of ungulate forage and edible flora, and tree patches provide protective shelter from predators and weather.
Talyor and Shaw (1927:12-13) also emphasize the subalpine zone's unique floral and faunal abundance.
Closed Pacific maritime forests give way to patchy subalpine associations above about 5,200 ft on the wetter northwest, west and southern sides of the mountain; and above 5,800 ft on the drier northeastern side. Tree groups become increasingly patchy and stunted with elevation, ultimately giving way to scrubline vegetation and full alpine tundra at about 6,200 and 6,800 ft on windward and leeward sides respectively. Figure 2.8 shows subalpine associations at circa 5,400 ft in Mist Park in Mount Rainier's northwest quadrant. The view is taken from Mt. Pleasant Rockshelter site FS 72-02 (45PI433). Two additional prehistoric sites and two isolate finds have been documented in the near vicinity.
Patchy forest associations are dominated by Pacific silver fir on wetter sides of the mountain. Mountain hemlock tends to predominate on the dry side (see Figure 2.5). Typically, subalpine stands incorporate a higher frequency of mountain hemlock, subalpine fir (Abies lasiocarpa), and white bark pine (Pinus albicaulis) than present at lower elevation. Alaska yellow-cedar is locally present in low density. Near timberline, subalpine fir is one of the last tree species to give way to alpine tundra.
Heather-dwarf huckleberry associations (Group 1 above) are most prevalent on gentle slopes with moderately well-drained soils. A good example are the south trending ridge near Mt. Ararat and parts of "Indian Henry's Hunting Ground"in the Park's southwest quadrant. Both heather and huckleberry are low-growing shrubs capable of forming nearly complete low ground cover mats. Franklin and Dyrness (1973:256) suggest that more purely dwarf huckleberry stands (such as those near Mt. Ararat) tend to be pioneer communities on burned habitats, and are succeeded either directly by forest (at lower elevation) or by more complex heather-huckleberry associations.
Ethnohistoric reports on the importance of dwarf huckleberry (V. deliciosum) are contradictory. Smith's (1964:160-161) sources refer to it variously as 1) of little economic importance because it grows too low to the ground and ripens too late in the year; and 2) gathered in quantity because the berry is large and low to the ground. It is plausible that the apparent contradiction is due to use as a buffering resource in years when lower elevation, taller V. alaskaense, ovalifolium and membranaceum varieties were not productive. In any case, dwarf huckleberry's subalpine co-occurrence with hunted game is likely to have ensured use minimally as a supplemental, if not staple, food item.
The lush herbaceous meadows (Group 2) are the richest and most diverse of the subalpine meadow communities (see Franklin and Dyrness 1973:256-262). These meadows develop on steep to moderate gradient, well watered, avalanche-prone slopes. They are common to the southern and western slopes of Mount Rainier. Specific floral composition varies. Community dominants listed by Henderson (1973) in Franklin and Dyrness include varieties of valerian (especially Velariana sitchensis), false hellebore (Veratrum viride), lupine (Lupinus latifolius), bistort (Polygonum bistortoides), sedge (Carex spectablilis), and monkeyflower (Mimulus lewisi). Actual composition, of course, is substantially more diverse. More important than specific floral composition is the capacity of these low maturity associations to provide forage for a variety of exploitable mammals such as elk, deer and marmots. If continuously maintained by frequent landslides, such communities may have been of substantial importance to prehistoric hunter-gatherers.
Black sedge (Carex nigricans) communities (Group 3) typically are found on relatively flat to rolling sites with short growing season due to late persisting snowpack and cold, wet soils (Franklin and Dyrness 1973:261). Floral diversity is relatively low and growth limited by the circumstances noted above. Local co-dominants include marshmarigold (Caltha biflora) and pedicularis (Pedicularis groenlandica).
Franklin and Dyrness' rawmark and low herbaceous category (Group 4) consists of poorly developed, pioneer associations in a variety of locations with well drained bouldery/gravely to sandy sediments (Franklin and Dyrness 1973:262-263). Slope is variable, ranging from alpine scree to low gradient regisols. Total plant cover varies from a low of about 20 percent to nearly complete. Dominant associations include saxifrage (Saxifraga tolmiei), luetkea (Luetkea pectinata), buckwheat-pussypaws (Eriononum pyrolaefolium-Spraguea umbellata), everlasting (Antennaria lanata), and aster-everlasting (Aster alpigenus-A. lanata).
Grassy parklands (Group 5) are particularly well developed on the drier northeastern side of the mountain. Two dominant community types intergrade on a moisture gradient (Henderson 1973 in Franklin and Dyrness 1973:263): fescue-lupine (Festuca viridula-Lupinus latifolius) in moist locations and fescue (F. Viridula-Aster ledophyllus) in drier places. Fescue-lupine associations are most commonly associated with level to low gradient parklands such as Sunrise Ridge and Grand Park. Fescue-aster associations are found on even drier steep, south facing slopes with coarse textures soils.
At first glance, faunal variation may not appear markedly different from the forest proper. However, overall diversity is greater and, importantly, seasonal abundance of larger and fatter (i.e., energy rich) animals is substantially higher. Animals such as black-tailed deer, elk, black bear, and marmots find better forage in the meadow/forest ecotone than in the closed forest (except for burn areas). Assuming game animals are not over hunted, the subalpine combination of high return faunal and floral species should have been attractive to human exploitation throughout the prehistoric past.
Subalpine Parkland, Land-Use and Archaeology
It should be noted in closing that subalpine communities exist in a state of dynamic tension between lower forest boundaries and the upper tree or shrubline (krummholtz) boundary with alpine tundra (see Franklin and Dyrness 1973:276-284). In the subalpine ecotone, density of tree stands decreases with elevation as dictated by local effects of wind, fire, avalanches and snowpack; and by the overarching effect of decreasing temperature. In general, trees invade subalpine meadows during prolonged periods of stable warm weather, and retreat in the face of cold or unstable conditions. That is, parkland meadows tend to shrink and move upslope during periods of climatic warming (providing fire frequency does not increase); and expand and move downslope during cool, excessively dry and/or unstable circumstances. If subalpine communities are as important to prehistoric hunters and gathers as suggested here, it is important to develop a thorough understanding of Holocene climatic variables in regard to their implications for the resource productivity of these zones.
Upper elevation tree clumps and scrubline mats of Englemann spruce (Picea englemannii) and subalpine fir give way to open alpine communities at about 6,200 to 6,800 ft on Mount Rainier. Alpine tundra extends upward to the firnline boundary with permanent snowfields at circa 7,600 ft. Because of Mount Rainier's great height and geological youth, much of the circa 7,600 ft upper boundary with permanent snowfields is characterized by rock and essentially vegetation free glacial rubble.
Figure 2.9 shows alpine tundra habitat and a pair of mountain goats (Oreamnos americanus) on Burroughs Mountain in the northeastern side of Mount Rainier. Fryingpan Glacier in the background and lower reaches of Emmons Glacier at photo right show increasingly barren glacial scree slopes and glacial scour at the alpine interface with standing snowfields.
Alpine Tundra Flora
Black crowberry/prairie lupine (Empetrum nigrum/Lupinus lepidus); north-facing fellfields.
Alpine Fauna, Land-Use and Archaeology
It is likely that goats, elk and perhaps marmots provided sufficiently productive food and wool sources to attract human predation in the alpine tundra zone. In the historic period, goat wool was highly prized for its beauty and warmth (see Eells 1985). Indeed, though other animals undoubtedly are present, to date the only unambiguously identified faunal remains in archaeological context are goat teeth from Fryingpan Rockshelter (FS 63-01 [45PI43]) (Gustafson:1983:27-28). Marmots may have been important for their fat. The benefit of elk, of course, lies in large body size and correspondingly high meat return per animal killed.
Because of unstable weather and availability of fewer specific resources, it is probable that alpine foraging tended to be carried out by small task-specific hunting groups with short duration camping, ambush, butchering or lithic procurement stops. If so, we should expect the alpine/upper subalpine archaeological record to reflect such constraints in the form of more functionally limited tool kits and lower artifact density (except at lithic quarries and butchering sites such as FS 86-01 [45PI407] at Frozen Lake). These qualities contrast with the subalpine to subalpine forest boundary where resource variety is greater and weather is milder. Lower-elevation conditions favor longer-term use, probably by a higher frequency of mixed sex gathering and hunting parties. We expect subalpine/upper forest margin sites should exhibit the full rage of sites common to alpine habitats plus a number of higher artifact count, multi-task assemblages consistent with more sustained and varied activities, and probably with more repetitive use. It is plausible, too, that select lower elevation places functioned as base camps from which more limited task gathering and hunting parties operated. Indeed, that argument will be made for three of Mount Rainier's lower subalpine/upper forest sitesFS 95-10 (45PI429) in the Park's southwest quadrant, and FS 71-01 (45PI438) and FS 90-01 in the northeast quadrant.
Perpetual snowfields with standing glaciers and associated barren rubble fields range from firnline at 7,600 ft to Mount Rainier's 14,410 ft summit. Individual glacial tongues and young recessional moraines extend downslope in major glacial valleys to circa 5,500 ft. The largest of theseCarbon, Winthrop, Emmons, Ingraham, Nisqually, Tahoma and Mowich Glaciersextend to below 5,000 ft.
Above the firnline, vegetation is suppressed by snow and ice mass. Floral species are limited essentially to mosses and lichens with very few grasses and flowering plants on rocky cleavers and other seasonally ice-free areas (Brockman 1947:6). Fauna are limited as well. A few marmots, pika, mice and shrews have been observed as high as 8,000 to 10,000 ft. Mice and even bear tracks have been reported at the summit (Schamberger n.d.:22). Clearly, such events are rare, and high mountain edible biomass is negligible. Perhaps the single exception to the pattern the presence of mountain goats which take advantage of glaciers and high rock fields for travel, observation, and escape. For the most part, however, Mount Rainier's glacial zone is largely devoid of economically useful plant and animal life.
Given logistical difficulty, relatively high risk and low return, we assume that prehistoric human use of high elevation Mount Rainier was limited to goat hunting, possible ceremonial use of the alpine/glacier interface, and very infrequent use of higher elevation snow and boulder fields. The highest elevation prehistoric archaeological finds presently documented on Mount Rainier are two isolated projectile points found at 7,500 ft on Success Cleaver (IF 01-70 in the southwest quadrant). Their presence is consistent with use of the locality as a hunting stop at the upper alpine/lower permanent snowfield boundary. We expect similar finds, perhaps associated with low stacked rock features or talus pits to be documented as cultural resource studies continue.
The following set of color maps (Figures 2.10, 11, 12 and 13) show Mount Rainier environmental zones and formally documented archaeological sites in four Park quadrants. Zonal boundaries are derived from environment data logged into the Park's geographic information system (GIS). Basic data on forest, subalpine and alpine boundaries were plotted from aerial photographs. They are intended to model climax vegetation associations, excluding effects of short-term fire alteration. Perpetual snowfield boundaries include standing glaciers, permanent snowpack and a 100 ft buffer to accommodate glacial scree slope rubble. High energy floodplains are those that have experienced major documented floods and/or lahars. These maps provide the best precision presently available for displaying environmental zones and for graphically illustrating association with documented prehistoric sites. The clear association of prehistoric sites with subalpine and alpine settings is consistent with ecological land-use arguments offered above, in ethnohistoric accounts collected by Smith (1964), and discussed in the following sections.
Last Updated: Monday, 18-Oct-2004 20:10:54
Author: Natural & Cultural Resources Division
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