Fauna of the National Parks No. 3
Birds and Mammals of Mount McKinley National Park
Geology of the Mount McKinley Region
NUMEROUS inquiries regarding the supposedly volcanic
origin of Mount McKinley have come to my attention and I am led,
therefore, to quote the following data from Bulletin 687 of the United
States Geological Survey, The Kantishna Region, Alaska by Stephen R.
Capps. On page 22 of this bulletin the following statement appears:
Although the outermost range of foothills is composed
dominantly of altered igneous rocks, the other foothill ranges and the
main Alaska Range south of this region may he said to be composed
primarily of material of sedimentary origin, with which are associated
minor amounts of igneous material. The range is therefore the result of
the folding and uplift of old sediments rather than a mountain mass
formed by the injection of large quantities of molten intrusive rocks or
by the upbuilding of a great mass of volcanic flows.
On page 71 of the same bulletin, when speaking of the
origin of Mount McKinley, the author says:
An important geologic event that occurred during the
closing stages of the Mesozoic era or at the beginning of the Tertiary
period was the uplift of a part of the Alaska Range, probably along its
present axis. This movement was the first of a series of uplifts, that
by their combined movements have given rise to the range that now
contains the loftiest peak on the continent, Mount McKinley.
Figure 1.Map of Mount
McKinley National Park.
(click on figure for an enlargement in a new window)