HD FS 102- Final Exam Guide - Comprehensive Notes for the exam ( 70 pages long!)
30 Nov 2017
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Environmental geology 101: but first, time: relative age dating i. 2cm. thousand yr: sediments accumulated in the area of the grand canyon for approx. 450 my (note the canyon itself is recent-only a few million years old: sediments in the canyon are about 1. 5 km thick i. The sand is compressed and erosion happens to make the. Principle of crosscutting relationships: unit that is cut is older, vein 1 is cut by vein number 2- therefore vein 1 is older, faulting has to happen after deposition iii. Principle of lateral continuity: layers of sediment extend laterally in all directions, units can be traces out over long distances (no layers is called an intrusion, looks kinda like a blob. , relative and absolute dating a. Isotopes- elements with same number of protons, but different number of neutrons i. ii. iii. Carbon-12 is stable and most common: 99% Carbon-13 is stable and second most common: 1%
