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Published byAugustus Higgins Modified over 9 years ago
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Late Paleozoic Geology
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Includes Devonian, Carboniferous, & PermianIncludes Devonian, Carboniferous, & Permian
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Late Paleozoic Introduction Formation of supercontinent - PangaeaFormation of supercontinent - Pangaea Continental collisions – mountain buildingContinental collisions – mountain building – Surrounded by global ocean - Panthalassa Fluctuating sea levelFluctuating sea level Various climatic conditions – arid & semiarid climatesVarious climatic conditions – arid & semiarid climates – Due to major continental ice sheets – advance/retreat – Sedimentary rocks: coal, evaporites, & tillites
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Late Paleozoic Paleogeography World View Late DevonianLate Devonian – Baltica meets Laurentia; Iapetus closes Caledonian Orogeny – Laurasia meets Gondwana Acadian Orogeny – Collision of island arc – western margin Antler Orogeny
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Late Paleozoic Paleogeography World View Carboniferous (known for coal deposits)Carboniferous (known for coal deposits) – Continents coming together Gondwana collides with Laurasia Siberia meets Kazakhstania – Quachita Mountains
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Late Paleozoic Paleogeography World View Late PermianLate Permian – Assembly of Pangaea complete Surrounded by one large ocean - Panthalassa Bounded by mountains Rainshadow – arid climate
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Late Paleozoic Major events of North AmericaMajor events of North America –Kaskaskia Sequence –Absaroka Sequence Cordilleran Appalachian Craton Late Paleozoic Early Paleozoic –Major Orogenies Antler (Corilleran) Acadian, Quachitan, Alleghenian (Appalachian)
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Paleozoic – Early Devonian North America Paleogeography – Major unconformity – Canadian reefs – Black shales Kaskaskia SequenceKaskaskia Sequence – Clean SS (Oriskany); some carbonates Between Tippecanoe and Kaskaskia Source from eroding Appalachian Barrier reef restricts flow - evaporites Mtn source – Acadian Orogeny
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Paleozoic – Upper Miss-Lower Jur North America Paleogeography Absaroka SequenceAbsaroka Sequence – Unconformity Miss–Perm boundary – Cyclothems Nonmarine-coal-Marine Transgression-Regression – Ancestral Rockies Gondwana collided with Laurasia – Evaporite & Reef Deposition Basins within ancestral Rockies
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Absaroka Sequence Typical Coal-Bearing Cyclothem Represent transgression & regression sequencesRepresent transgression & regression sequences Separated by erosional surfaceSeparated by erosional surface Represents ideal conditions – not all beds are representedRepresents ideal conditions – not all beds are represented
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Coal Development Large lowland next to seaLarge lowland next to sea – Slight rise in sea level flood; slight drop exposure Results in alternating marine & nonmarine environmentResults in alternating marine & nonmarine environment Modern examples: Mississippi Delta, Florida EvergladesModern examples: Mississippi Delta, Florida Everglades
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Ancestral Rockies Southwest N. America Collision of Gondwana and LaurasiaCollision of Gondwana and Laurasia Fault-bounded uplifted blocksFault-bounded uplifted blocks Exposure and erosion of pre-Є basementExposure and erosion of pre-Є basement – Coarse, red arkosic sand & conglomerate
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Ancestral Rockies Evaporite & Reef Deposits Occurred in various basins bordering ancestral RockiesOccurred in various basins bordering ancestral Rockies Barrier reef restricted flowBarrier reef restricted flow Evaporites (central basin); reefs (perimeter)Evaporites (central basin); reefs (perimeter) Capitan Limestone, Guadalupe Mtns Permian Reef Reconstruction
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Late Paleozoic Orogenies Cordilleran Mobile BeltCordilleran Mobile Belt Quachita Mobile BeltQuachita Mobile Belt Appalachian Mobile BeltAppalachian Mobile Belt – Antler Orogeny – Caledonian Orogeny – Acadian Orogeny – The Old Red Sandstones – Alleghenian Orogeny – Quachitan Orogeny
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