What to know for Tuesday’s Paleontology Exam. What are the four units used to measure Geologic Time? (March thru Time notes). Know the four eras, the 12 periods, and the seven epochs we covered, with their symbols.
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As a generalization, red refers to exposed Precambrian rocks, purple to Lower Paleozoic, blue to Upper Paleozoic, greens to Mesozoic rocks, yellows to Cenozoic; and buffs to Pleistocene rocks.
Dark red (Central)– Precambrian
Blue – Early Pz
Gray – Late Pz
Dark red (Panhandle) – early Mz
Green – late Mz
Orange/Olive/Brown – early Cz
Bright Red (West) – early Cz volcanics
Bright Red (East) – early Cz sediments
Yellow – Q