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For example, we could use a ruler to draw a straight line (a "transect") from the northwest corner to the southeast corner of the topographic map in our lab kit; then we could draw in the topographic profile along this transect by using the contour line information on the map (as done on page 18).In the same way, such a transect could also show the inferred profile of the geology underfoot -- the expected rock layers and structures beneath the land from the northwest corner to the southeast corner of the map. You can open a larger version of this diagram by clicking on it.What principle(s) of relative dating did you use in order to arrive at your interpretation of the relative timing of each event?The various sedimentary layers are labeled as B, E, K and W.Determining the Age of Rocks and Fossils, University of California, Berkeley. This 9-12-grade activity introduces students to age dating with exercises using relative and absolute dating. Links to various activities and lesson plans concerning relative and absolute dating. Content information about absolute and relative dating methods used by the U. without knowing the absolute ages at which the rocks themselves formed.
We have seen that a cliff or a road cut is a local "geologic cross-section" -- a side view of the geology at one location.
Notice that the various sedimentary layers have been labeled with letters.
Also an igneous intrusion is present (labeled T) and a fault is present (labeled A).
Along with these geologic maps, we can reconstruct a regional geologic cross-section which would be like a great "geologic slice" through the landscape.
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.