GLGY 209 Study Guide - Final Guide: Mesozoic, Marie Tharp, Seafloor Spreading
26 Jul 2018
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Layers will run parallel to the earth"s surface due to the equal forces of gravity, and when the sediments are turned to stone (lithification), these layers will persist: lateral continuity: continuity will remain through process of lithification. Note: anything that crosscuts a layer is necessarily younger than the rock it crosscuts. James hutton; surface phenomena: rain and wind slowly broke down and transported parts of the surface away to the ocean. sediment is placed into thin layers. Neptunists: considered that the earth originated beneath and emerged from a massive ocean. as those waters receded, mineral precipitated out, creating crystalline, primary rocks. Mary anning: "sally sells seashells by the seashore"; sold seashells to make money for her family. Fossils are rare because: a) the environment that allows for fossilization requires for special circumstances and b) the organism needs to have body parts that are more likely to be preserved. No change in material; often happens with seashells.
