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Late Ordovician (Turinian–Chatfieldian) carbon isotope excursions and their stratigraphic and paleoceanographic significance
Five positive carbon isotope excursions are reported from Platteville–Decorah strata in the Upper Mississippi Valley. All occur in subtidal carbonate strata, and are recognized in the Mifflin, GrandExpand
Meteoric sphaerosiderite lines and their use for paleohydrology and paleoclimatology
Sphaerosiderite, a morphologically distinct millimeter-scale spherulitic siderite (FeCO 3 ), forms predominantly in wetland soils and sediments, and is common in the geologic record. AncientExpand
The mid-Cretaceous water bearer: isotope mass balance quantification of the Albian hydrologic cycle
A latitudinal gradient in meteoric N 18 O compositions compiled from paleosol sphaerosiderites throughout the Cretaceous Western Interior Basin (KWIB) (34^75‡N paleolatitude) exhibits a steeper, moreExpand
Palaeoclimatic constraints for palaeozoic Palaeolatitudes of Laurentia and Euramerica
  • B. Witzke
  • Geology
  • Geological Society, London, Memoirs
  • 1990
Abstract Palaeozoic lithic palaeoclimatic data were plotted at the series or stage level for Laurentia (North America) and Euramerica. Their distribution was used to infer the extent of humid andExpand
Models for circulation patterns in epicontinental seas applied to paleozoic facies of North America craton
Circulation in epicontinental seas develops in response to thermohaline, wind-driven, and tidal motions in various climatic, geographic, and bathymetric settings. Mass balance relations in a seawayExpand
Middle and Upper Ordovician Paleogeography of the Region Bordering the Transcontinental Arch
Abstract Following a period of Whiterockian erosion, Middle Ordovician seas transgressed into the North American continental interior, and a diachronous sheet of clastic sediments (St. Peter, McLish,Expand
Possible Late Middle Ordovician Organic Carbon Isotope Excursion: Evidence from Ordovician Oils and Hydrocarbon Source Rocks, Mid-Continent and East-Central United States
Oils generated by Middle Ordovician rocks are found throughout the Mid-Continent and east-central regions of the United States. Gas chromatographic characteristics of these oils include a relativelyExpand
Carbonate component chemostratigraphy and depositional history of the Ordovician Decorah Formation, Upper Mississippi Valley
The Decorah Formation of eastern Iowa was deposited on an open-marine subtidal shelf near storm wave base. Maximum transgression is represented in organicrich strata of the Guttenberg Member.Expand
Record of the Late Devonian Hangenberg global positive carbon-isotope excursion in an epeiric sea setting: Carbonate production, organic-carbon burial and paleoceanography during the late Famennian
Latest Famennian marine carbonates from the mid-continent of North America were examined to investigate the Late Devonian (very late Famennian) Hangenberg positive carbon-isotope (δCcarb) excursion.Expand
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