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The
Florissant Formation: A Virtual Tour
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Pikes Peak Granite Close-Up
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Close-up of Pikes Peak Granite
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Pikes Peak Granite
Pikes
Peak Granite is the oldest stratigraphic unit in the
Florissant Fossil Beds National Monument, dated at 1.08
Ga. Pikes
Peak Granite is a medium to course grained pink to reddish-tan
granite. The pink color is due to the potassium rich
feldspar minerals. The granite also contains the minerals
quartz,
biotite and hornblende. Cripple Creek Granite found south
to southwest of Florissant is also a pink granite, but
is fine to medium grained and contains muscovite, which
is lacking in the Pikes Peak Granite (Meyer, Veatch,
and Cook, 2004, p. 154).
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Bibliography
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Meyer,
H.W., Veatch, S.W. and Cook, A. (2004). Field guide to
the paleontology and volcanic setting of Florissant fossil
beds, Colorado (pp. 151-166). In Nelson, E.P. and Erslev,
E.A. [Eds.] Field Trips in the Southern Rocky Mountains,
USA. Geological Society of America Field Guide 5. |
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