EARLY PALEOZOIC EVENTS CAMBRIAN PALEOGEOGRAPHY Development of a shallow epeiric or epicontinental sea Continent situated on the equator, so waters most likely warm Significant carbonate deposits accumulate Deep water sediments (shales) are accumulating on margins
EARLY PALEOZOIC EVENTS CAMBRIAN PALEOGEOGRAPHY Cambrian stromatolites Petrified Sea Gardens Saratoga Springs, NY
EARLY PALEOZOIC EVENTS CAMBRIAN PALEOGEOGRAPHY Nonconformity Tapeats Ss. Bright Angel Sh. Mauv Ls.
EARLY PALEOZOIC EVENTS CAMBRIAN PALEOGEOGRAPHY
EARLY PALEOZOIC EVENTS CAMBRIAN PALEOCLIMATE
EARLY PALEOZOIC EVENTS CAMBRIAN PALEOCLIMATE
EARLY PALEOZOIC EVENTS ORDOVICIAN PALEOGEOGRAPHY Ordovician named after the Ordovices, an early Celtic tribe named by Charles Lapworth as a compromise in 1879
EARLY PALEOZOIC EVENTS ORDOVICIAN PALEOGEOGRAPHY Ordovician continents still centered along Equator
EARLY PALEOZOIC EVENTS ORDOVICIAN PALEOGEOGRAPHY Ouachita Terrane Broken off Laurentia Forms a microcontinent Will collide with South America
EARLY PALEOZOIC EVENTS ORDOVICIAN PALEOGEOGRAPHY Taconic Orogenic Belt Begins development along margins of Laurentia and Baltica
EARLY PALEOZOIC EVENTS ORDOVICIAN PALEOGEOGRAPHY
EARLY PALEOZOIC EVENTS ORDOVICIAN PALEOGEOGRAPHY Global sea level is high Gondwanaland moving towards South Pole
EARLY PALEOZOIC EVENTS ORDOVICIAN PALEOGEOGRAPHY Gondwanaland moving towards South Pole Leads to glaciation at the end of Ordovician
EARLY PALEOZOIC EVENTS ORDOVICIAN PALEOGEOGRAPHY Sea level high Canadian Shield being covered by sediments Shallow water carbonates in the mid-continent regions with mudcracks and stromatolites in Early Ordovician
EARLY PALEOZOIC EVENTS ORDOVICIAN PALEOGEOGRAPHY Carbonate deposition ended in the Middle Ordovician Region was downwarped Caused by closing of the Iapetus Ocean along a subduction zone
EARLY PALEOZOIC EVENTS ORDOVICIAN PALEOGEOGRAPHY
EARLY PALEOZOIC EVENTS ORDOVICIAN PALEOGEOGRAPHY
Prior to the Taconic orogeny, the "east" coast of what is now the United States was located near the Hudson River valley, Philadelphia, Washington, DC and extended to western South Carolina. The Taconic Orogeny added land to Proto North America that is now the western portions of New England and the Canadian Maritime provinces. This collision added land and raised mountains southward through northern New Jersey, south-eastern Pennsylvania, Virginia and North Carolina. Occurred approximately myBP EARLY PALEOZOIC EVENTS ORDOVICIAN PALEOGEOGRAPHY
EARLY PALEOZOIC EVENTS ORDOVICIAN PALEOGEOGRAPHY
EARLY PALEOZOIC EVENTS ORDOVICIAN PALEOGEOGRAPHY The Taconic island chain began to collide with Proto North America about 470 to 450 million years ago The energy of ongoing impacts was still raising mountains from Canada to Virginia 430 million years ago. The Iapetus Ocean, which had been the shoreline for Proto North America, is closing as Western and Eastern Avalonia, following behind the Taconic arc, are heading for collision with the recently-extended coast of Proto North America.
EARLY PALEOZOIC EVENTS ORDOVICIAN PALEOGEOGRAPHY TAC Taconic Island Chain EAV Eastern Avalon Terrane WAV Western Avalon Terrane
EARLY PALEOZOIC EVENTS ORDOVICIAN PALEOGEOGRAPHY
Taconic Orogeny Latest Earliest
EARLY PALEOZOIC EVENTS ORDOVICIAN PALEOGEOGRAPHY
EARLY PALEOZOIC EVENTS ORDOVICIAN PALEOGEOGRAPHY St. Peter Sandstone
EARLY PALEOZOIC EVENTS ORDOVICIAN PALEOGEOGRAPHY St. Peter Sandstone
EARLY PALEOZOIC EVENTS ORDOVICIAN PALEOGEOGRAPHY St. Peter Sandstone