EAS201 Lecture Notes - Lecture 13: Devonian, Metamorphism, Mesozoic
20 Sep 2016
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Geologic time: age of our planet, duration of certain things to form, and how we know how old things are. ~4. 28 b. b nuwuagittuq, quebec oldest known rock on earth. 66 marks million of years end of metazoic beginning of. Irregular durations of eons, eras, and periods. You find this very very distinct change in the lithology (rock) We"ve only known the age of earth for ~60ish years. Relative dating rates of sedimentation and erosion. Relative dating: (none of these things will tell you when things happen) Principle of stratigraphic superposition (recognized scientifically) the higher you go in layers = the younger the strata. Features to tell top or bottom: cross bedding (top), graded bedding(middle), ripple marks(bottom) Represented by a very narrow line, always a wavy line (1) disconformity: the beds below and above the uniformity are parallel to one another. Stage one: deposition stage two: uplift and erosion stage three: deposition (2) angular uncomformity.
