Thus, the layers are successively younger, going from bottom to top. The convention in geology is to number the layers beds within a sequence such that the oldest layer has the lowest number. In the illustration, layer 1 was deposited at time 1. At time 2, layer 2 was deposited on top of layer 1.
In this activity you will learn to determine the sequence of geologic events from cross-sections of strata rocks in a given area. It is a bit of a mind-puzzler, so have fun! Before absolute dating of rocks was developed in the 20th century, geologists had to rely on relative age dating, which places geologic events in their order of occurrence. The method begins with the careful drawing and description of strata the geologic cross section or profile.
February 27, Note: Please keep in mind that other HW assignments will be assigned! A practicum is a real life application of something you are studying. In our case, this is relative dating and the law of superposition.
No reproduction may be made without prior approval from the author Dr. Relative Dating of Geologic Cross-Sections: 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.
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