To the south, the orogen contributed to the subsurface Phanerozoic strata in Montana and the Dakotas that created the Great Plains.
32.
Since there are no index fossils, the sedimentary rocks cannot be dated using fossils, like they can in Phanerozoic rocks.
33.
A thin veneer of mainly Phanerozoic sedimentary basins cover much of the Australian landmass ( these are up to 7 km thick ).
34.
But the breakup of Pangaea started early in the Mesozoic, meaning that CPT only accounts for part of the entire Phanerozoic geological record.
35.
They studied samples from all over the world, and from many dates, beginning with the Late Precambrian, just before the Phanerozoic begins.
36.
The Cretaceous is justly famous for its chalk; indeed, more chalk formed in the Cretaceous than in any other period in the Phanerozoic.
37.
Corals, including some major extinct groups Rugosa and Tabulata, have been important reef builders through much of the Phanerozoic since the Ordovician Period.
38.
However, once the dust had settled, overall disparity and diversity returned to the pre-extinction level in each of the Phanerozoic extinctions.
39.
The ICS and circa 1982 Geologic Time Scale are analyzed for covariant ( equal ) variance intervals and 417Ma is solid within the Phanerozoic Eon.
40.
This type of volcanism is commonly observed in Phanerozoic volcanic massive sulfide systems, and is not commonly observed in modern back-arc basins.
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