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Showing 1 to 8 of 8 for “"Upper Silurian"”.
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Paleoenvironmental Analysis Of The Upper Silurian Callocystitidae (Cystoidea, Rhombifera) In The Central Appalachians
The dominantly transgressive Upper Silurian interval of the Keyser Limestone (U. Sil. - L. Dev.) in the central Appalachians has yielded the most diverse fauna of rhombiferan cystoids found in any single formation in North America. All forms are members of the Callocystitidae, a diverse family of …
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The Williamsport Sandstone: Precession and Ecentricity Forced Cyclicity in the Upper Silurian Strata of Central Pennsylvania, Western Maryland, and Northeastern West Virginia
The Upper Silurian Williamsport Sandstone Member of the Bloomsburg Formation, upper Ludlovian to lower Pridolian in age, is the initial deposit of the Salina Group second order supersequence. The Salina Group supersequence includes the Wills Creek and Tonoloway Formations which together may …
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Orbital-scale fluctuations in continental weathering flux and continental ice-volume during greenhouse and icehouse climate intervals : evidence from oxygen and neodymium isotopes
… during two global greenhouse intervals: the Late Silurian and Late Devonian. The first study (Chapter 1) explores whether glacio-eustasy was the driver for orbital-scale shallowing-upward cycles developed in Late Silurian and early Late Devonian tropical and subtropical greenhouse climates. Two …
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Kinematics of detachment folding, Appalachian Valley and Ridge, West Virginia
… Geometric analysis of a first-order fold in the upper, Silurian-Devonian sheet indicates it is a detachment fold with a detachment depth of up to four kilometers. The estimated detachment depth indicates involvement of the underlying, thrusted Cambrian-Ordovician sheet in the folding. Kinematic …
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Analysis of Small-Scale Cyclicity in the Williamsport Sandstone Member and the Lower Wills Creek Formation in Pennsylvania and Maryland
Allocyclic analysis of a 25-meter interval of Upper Silurian peritidal siliciclastic and carbonate facies of Maryland and central Pennsylvania reveals a four-tiered hierarchic cyclic fabric correlative over 125 kilometers. The structure of this correlative framework in the Williamsport Member of …
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Geology and ground-water resources of the Tannersville-Tumbling Creek area, Washington, Smyth, and Tazewell counties, Virginia
… to and beyond Tannersville, Tazewell County, the Silurian Tonoloway limestone is intercalated within a succession of otherwise impervious strata. Groundwater circulation is localized within the Tonoloway in which large groundwater conduits have been created by dissolution. The area studied …
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Geo- and biodynamic evolution at the northern margin of Gondwana during Late Silurian to Early Devonian time (Hazro Area, SE Turkey)
… literature survey of 24 worldwide occurring Silurian/Devonian boundary sites and a subsequent organic geochemical evaluation of eight of these locations from Turkey, Morocco, Ukraine, Poland as well as from the stratotype section in the Czech Republic revealed that the organic matter of …