Muita ideoita: Jaana
Early Mississipian

Early Mississipian

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Map of North America 74 million years ago. Red star showing location of the extinct palm flower Protoarecoidea buchananensis (Feldman) found in clay dated 14 million years later than this. These palms lived in a coastal warm, moist climate of the Mississippi embayment  (Info integrated onto a Portion of a National Geographic Map)

Map of North America 74 million years ago. Red star showing location of the extinct palm flower Protoarecoidea buchananensis (Feldman) found in clay dated 14 million years later than this. These palms lived in a coastal warm, moist climate of the Mississippi embayment (Info integrated onto a Portion of a National Geographic Map)

16147a08fig2.jpg (1025×849)

16147a08fig2.jpg (1025×849)

A paleogeographic reconstruction of North America during the Late Cretaceous, 85Ma wriggly_fish:The author has a beautiful map library found here: http://cpgeosystems.com/namkeyframe.html

A paleogeographic reconstruction of North America during the Late Cretaceous, 85Ma wriggly_fish:The author has a beautiful map library found here: http://cpgeosystems.com/namkeyframe.html

North American tectonics during the Early Cretaceous (125 Ma) Two large arms of the rising sea are about to converge, held up temporarily by tectonic barriers such as the Trans-Continental Arch and the Ouachita Uplift. Ocean basins, inherently deeper, are designated as dark blue: whereas, shallow epicontinental (epeiric) basins and continental shelves are light blue. Adapted from Ron Blakey and Colorado Plateau Geosystems Inc.

North American tectonics during the Early Cretaceous (125 Ma) Two large arms of the rising sea are about to converge, held up temporarily by tectonic barriers such as the Trans-Continental Arch and the Ouachita Uplift. Ocean basins, inherently deeper, are designated as dark blue: whereas, shallow epicontinental (epeiric) basins and continental shelves are light blue. Adapted from Ron Blakey and Colorado Plateau Geosystems Inc.

Devonian, 417-354 Ma ago: by the Mid-Late Devonian, contin-ental movement increased re-sulting in numerous mtn-build-ing events. By 190 Ma ago, NA & EU collided to form a large continent, called Euroamerica, which sat near the equator. The Supercontinent Gondwana & Euroamerica were surrounded by subduction zones on all sides. Most of the landmasses were bunched up, & a vast ocean covered the rest of the planet

Devonian, 417-354 Ma ago: by the Mid-Late Devonian, contin-ental movement increased re-sulting in numerous mtn-build-ing events. By 190 Ma ago, NA & EU collided to form a large continent, called Euroamerica, which sat near the equator. The Supercontinent Gondwana & Euroamerica were surrounded by subduction zones on all sides. Most of the landmasses were bunched up, & a vast ocean covered the rest of the planet