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Results 21-30 of about 43,800 for: most abundant igneous rock of yosemite

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North Cascades Geology: Rocks and Minerals

Igneous rocks form from ... glassy, basalt is the most common volcanic rock and well represented ... of ultramafic rocks crop out in the North Cascades: ...

http://www2.nature.nps.gov/.../nocageol2a.html

Self-Guided Geologic Tour in Joshua Tree National Monument ...

Feldspar minerals are aluminum silicates containing one or two metals and are the most common rock ... The most recent of all igneous intrusive rocks in ... Gneiss ...

http://www.nps.gov/.../sec1.htm

Yosemite NP: Rules and Regulations (1920)

Common up to about 8,200 feet; most abundant below 5,000 feet. (Yosemite Valley; Porcupine Flat; ... —Common on rock walls of Yosemite Valley, ...

http://www.nps.gov/.../sec9.htm

FORMATION OF THE YELLOWSTONE CALDERA - USGS: Geological ...

... is commonly used to describe these rocks, which now make up the Yellowstone ... Abundant, though less ... they form some of the most unusual rock units in the ...

http://www.cr.nps.gov/.../sec3.htm

NPS: Explore Nature » Geologic Resources » Education

Igneous rocks ... to describe an igneous rock having abundant ... National parks with excellent examples of intrusive igneous rocks include Yosemite ...

http://www2.nature.nps.gov/.../rocks.cfm

Geologic Glossary A through C - National Park Service

A light-colored igneous rock with the same ... Basalt makes up most of the ocean floor and is the most abundant volcanic rock in the ... USGS Geology in ...

http://www2.nature.nps.gov/.../glossaryAtoC.html

California Division of Mines and Geology: Bulletin 182 ...

Geologic Guide to the Merced Canyon and Yosemite Valley, California: ... metamorphic and igneous rocks, ... is the common clay mineral of ...

http://www.nps.gov/.../sec4.htm

Pre-Visit Lesson: Rocks and Minerals - National Park Service

Most rocks are made up ... is sedimentary rock. Sedimentary rocks are most common at or near ... sedimentary and igneous rocks that are buried deep in ...

http://www.nps.gov/.../Pre-visit%20Rocks%20and%20Minerals.doc

California Division of Mines and Geology: Bulletin 182 ...

Geologic Guide to the Merced Canyon and Yosemite Valley ... of the Hayward fault zone and is largely mafic igneous rock ... are present but not abundant.

http://www.nps.gov/.../sec5.htm

USGS: Geological Survey Bulletin 1191 (Glossary)

Porphyry, an igneous rock containing abundant phenocrysts set in a finer grained groundmass.

http://www.cr.nps.gov/.../glossary.htm