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Posted by / 01-Jul-2017 17:51

Cliffs, road cuts, and non-vegetated landscapes allow us glimpses into geology which is often hidden from view.Cliffs and road cuts are "side views" or "geologic cross-sections" of the topography which show the relative positions of various rock layers and structures at a given spot.We will learn more about this method of identifying rock units and geologic time periods in next week's lab.

The timing of the fault (break) in the rocks (labeled as Q) must be included in the sequence of events.In the next lab, we will learn how to use local geologic information from outcrops to begin to build such regional geologic maps and geologic cross-sections, but for now we just want to practice how to read them.Remember when we drew a topographic profile for lab manual exercise #1 (page 18) on Topographic Maps?This map displays the large-scale (also called "regional") geologic features they have inferred are present beneath the landscape.Along with these geologic maps, we can reconstruct a regional geologic cross-section which would be like a great "geologic slice" through the landscape.

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