Kinesiology 1080A/B Lecture Notes - Lecture 19: Geologic Time Scale, Metamorphic Rock, Unconformity
13 Nov 2014
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Superposition: each bed is older than the one above, and younger than the one below. A fault is younger than the rock it cut. A rock is younger than the rock it cuts. Inclusions: inclusions are older then the rock containing them. Angular unconformity: between flat and titled, eroded beds. Nonconformity: between flat beds in eroded igneous, metamorphic rock. Fossil succession: organisms evolved along distinct pathways through geologic time, left index fossils. Radioactive isotopes (parents) decay to daughters over time. Time it takes to decay half the amount of parent left is the half-life of the isotope. Compare parent left with half-life, give time since rock formed. Oldest rocks onn earth are is hudson bay. In organisms c14 decays to n14 with half life of 5730 years but is replaced by c14 from the air.
