Item talk:Q252637

From geokb

{

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   "name": "Late Devonian glacial deposits from the eastern United States signal an end of the mid-Paleozoic warm period",
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   "abstract": "A\u00a0Late Devonian\u00a0polymictic\u00a0diamictite\u00a0extends for more than 400\u00a0km from northeastern Pennsylvania across western Maryland and into east-central West Virginia. The matrix-supported, unbedded, locally sheared diamictite contains subangular to rounded\u00a0clasts\u00a0up to 2\u00a0m in diameter. The mostly rounded clasts are both locally derived and exotic; some exhibit\u00a0striations, faceting, and polish. The diamictite commonly is overlain by laminated siltstone/mudstone\u00a0facies\u00a0associations (laminites). The laminites contain isolated clasts\u00a0ranging\u00a0in size from sand and\u00a0pebbles\u00a0to boulders, some of which are striated. The diamictite/laminite sequence is capped by massive, coarse-grained, pebbly\u00a0sandstone\u00a0that is trough cross-bedded. A stratigraphic change from red, calcic paleo-Vertisols in\u00a0strata\u00a0below the diamictite to non-calcic paleo-Spodosols and\u00a0coal beds\u00a0at and above the diamictite interval suggests that the climate became much wetter during deposition of the diamictite. The diamictite deposit is contemporaneous with regressive facies that reflect fluvial incision during the Late Devonian of the Appalachian basin. These deposits record a Late Devonian episode of climatic cooling so extreme that it produced\u00a0glaciation\u00a0in the Appalachian basin. Evidence for this episode of climatic cooling is preserved as the interpreted\u00a0glacial deposits\u00a0of diamictite, overlain by glaciolacustrine\u00a0varves\u00a0containing dropstones, and capped by sandstone interpreted as braided stream\u00a0outwash.The Appalachian glacigenic deposits are contemporaneous with glacial deposits in South America, and suggest that Late Devonian climatic cooling was global. This period of dramatic global cooling may represent the end of the mid-Paleozoic warm interval that began in the Middle\u00a0Silurian.",
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