Sierra Nevada Airstreams -> Education

Learning about the Eastern Sierra Nevada and Great Basin Area


geology geography geophysics geochemistry geochronology ...

Pyramid Lake

The gem if the Piaute Indian Reservation in northwest Nevada

Geologic Time Divisions

People who play with rocks notice patterns in how they are found and the fossils within them. These findings of patterns have resulted in a classification and categorization that is called a geologic time division. It is used to help piece together the natural history of areas by the placement of rocks. To see where such references such as Mesozoic fit into the picture, check the following links.

Links - USGS - Berkely - colorado mall - mindspring (many good links here) - MSU (nice bar chart) - paleos (describes the 6 orders or time scales for categorizing geologic time scales) - geosociety (need glasses for this chart! PDF version of 1999 Geologic Time Chart - good reference)

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