Geology (Unit 2) - Geologic Maps

Geologic Maps

Geologic maps are important tools for understanding the distribution of rocks along the Earth's surface and for identifying particular rock units or formations in the field. Subsurface geology controls availability of water, influences vegetation, and plays a large role in where we can build our homes and businesses. Not only are geologic maps economically important, they also help us determine the geologic processes that shaped the landscape.

Geologists throughout history have used many different methods to create geologic maps, from satellite analysis to careful field investigation. In this unit, you will make a map using data comparable to those collected by a field geologist. Map locations and "rock samples" will enable you to make your own geologic map of the Florissant area.


  1. See what the rocks look like by clicking on the orange dots below.
  2. Click on the "Printable Version" icon to print your own copy of this map.
  3. Color the map according to the directions in the legend.
  4. Click here to check your work
  5. When you are finished with this exercise, go to the next page: Stratigraphy of the Florissant Formation.
Florissant Geologic Map     link to the new lahar locality    link to the lake george locality    link to the wildlife loop trail locality    link to the barksdale picnic area locality    link to the commercial quarry locality    link to the visitor center area locality    link to the big stump locality    link to the boulder creek trail locality    link to a pdf version of this map

Last updated: February 24, 2015

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