GEOS101 in term test

lab stuff

Year and Eon of Earths origin

Hadean eon, 4.56Ga

What Eon occurs from 4.0-2.5Ga

Archaen

What eon occurs between 2.5Ga and 542Ma

Proterozoic

What Eon occurs from 542Ma-present

Phanerozoic

What is a significant event occuring in 542Ma and what are the time markers

The Cambrian Explosion (earliest shelly animals), marks the beginning of the Cambrian Period, Paleozoic Era and the Phanerozoic Eon. (also earliest rocks in NZ (Cobb Valley)

Chronologically list the Periods that occur in the Paleozoic Era and their dates.

Cambrian (542Ma), Ordovician (485Ma), Silurian (444Ma), Devonian (419Ma), Carboniferous (359Ma), Permian (299Ma)

What significant event marks the beginning of the Mesozoic Era and Triassic Period? When did it occur?

At 252Ma, The ‘mother’ of all mass extinctions occured, causing 96% of all species to go extinct.

Chronologically list the Periods that occur in the Mesozoic Era and their dates.

Triassic (252Ma), Jurassic (201Ma), Cretaceous (145Ma).

Chronologically list the Periods and Epochs that occur in the Cenozoic Era and their dates.

Paleogene Period(66Ma); Epochs: Paleocene (66Ma), Eocene (56Ma), Oligocene (33.9Ma). Neogene Period (23Ma); Epochs: Miocene (23Ma), Pliocene (5.3Ma). Quaternary Period (2.58Ma); Epochs: Pleistocene (2.58Ma), Holocene or recent (0.012Ma).