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Cambrian Paleogeography: Shifting Seas and Transformative Geology, Slides of Earth Sciences

The geological history of the cambrian period, focusing on the transgressions and regressions of shallow epicontinental seas that covered the central us. The impact of proterozoic glaciations on sea levels, the visible evidence of these changes in the grand canyon, and the variable sea levels represented by sequences of sediments on cratons. Additionally, it covers the ordovician period, early paleozoic climates, and the emergence of diverse life forms during the cambrian and ordovician eras.

Typology: Slides

2012/2013

Uploaded on 07/23/2013

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CAMBRIAN
PALEOGEOGRAPHY:
SHALLOW
EPICONTINENTAL
SEAS COVERED THE
CENTRAL US
Earliest Paleozoic time
of lowest sea level due to
Proterozoic glaciations
By middle Cambrian sea
had flooded the continent
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CAMBRIAN

PALEOGEOGRAPHY:

SHALLOW

EPICONTINENTAL

SEAS COVERED THE

CENTRAL US

Earliest Paleozoic timeof lowest sea level due toProterozoic glaciationsBy middle Cambrian seahad flooded the continent

LITHOLOGIC FACIES OF THE CAMBRIAN

The transgression of theCambrian is visible inthe rocks of the GrandCanyon

ORDOVICIAN-

PALEOGEOGRAPHY

Tippecanoe TransgressionSt. Peter’s Sandstone

The Queenston Clastic Wedge

Redbeds coarser towardsthe source area, TaconicHighlands (4000m)

PALEOZOIC LIFE

• Cambrian Explosion>Break up of Rodinia

  • radiation of all phyla>Continental Shelves

Cambrian Reef Systems

• Cambrian extinctions (2nd largest)• Ordovician radiation• Global Faunas (Cambrian vs. Paleozoic

Faunas)

• Ordovician Reef Systems• End-Ordovician extinction events