Publications
Filter Total Items: 890
40Ar 39Ar age constraints on neogene sedimentary beds, Upper Ramparts, half-way Pillar and Canyon village sites, Porcupine river, east-central Alaska 40Ar 39Ar age constraints on neogene sedimentary beds, Upper Ramparts, half-way Pillar and Canyon village sites, Porcupine river, east-central Alaska
40Ar/39Ar ages of volcanic rocks are used to provide numerical constraints on the age of middle and upper Miocene sedimentary strata collected along the Porcupine River. Intercalated sedimentary rocks north of latitude 67°10′N in the Porcupine terrane of east-central Alaska contain a rich record of plant fossils. The fossils are valuable indicators of this interior region's paleoclimate...
Authors
Michael J. Kunk, H. Rieck, T. D. Fouch, L. David Carter
The Pennsylvanian Fire Clay tonstein of the Appalachian basin—Its distribution, biostratigraphy, and mineralogy The Pennsylvanian Fire Clay tonstein of the Appalachian basin—Its distribution, biostratigraphy, and mineralogy
The Middle Pennsylvanian Fire Clay tonstein, mostly kaolinite and minor accessory minerals, is an altered and lithified volcanic ash preserved as a thin, isochronous layer associated with the Fire Clay coal bed. Seven samples of the tonstein, taken along a 300-km traverse of the central Appalachian basin, contain cogenetic phenocrysts and trapped silicate-melt inclusions of a rhyolitic...
Authors
C. L. Rice, Harvey E. Belkin, T.W. Henry, R. E. Zartman, Michael J. Kunk
Digital bedrock geologic map of the Plymouth quadrangle, Vermont Digital bedrock geologic map of the Plymouth quadrangle, Vermont
No abstract available.
Authors
Gregory J. Walsh, Nicholas M. Ratcliffe
Geologic, hydrologic, and water-quality data for a multi-aquifer system in Coastal Plain sediments near Millers Pond, Burke County, Georgia, 1992-93 Geologic, hydrologic, and water-quality data for a multi-aquifer system in Coastal Plain sediments near Millers Pond, Burke County, Georgia, 1992-93
No abstract available.
Authors
John S. Clarke, William F. Falls, Lucy E. Edwards, Norman O. Frederiksen, Laurel M. Bybell, Thomas G. Gibson, Ronald J. Litwin
Digital bedrock geologic map of the Plymouth quadrangle, Vermont Digital bedrock geologic map of the Plymouth quadrangle, Vermont
No abstract available.
Authors
Gregory J. Walsh, Nicholas M. Ratcliffe
Paleogene stratigraphy of the Solomons Island, Maryland, corehole Paleogene stratigraphy of the Solomons Island, Maryland, corehole
The Solomons Island corehole was drilled in the hope of obtaining a continuous and more nearly complete section of upper Paleocene and lower Eocene strata than are found in the discontinuous and fragmentary sections in the outcrop belt to the west. Consultation with Harry Hansen (Maryland Geological Survey) on possible drilling sites that were within the limits of our equipment and...
Authors
Thomas G. Gibson, Laurel M. Bybell
Preliminary analysis of integrated stratigraphic data from the South Venice corehole, Sarasota County, Florida Preliminary analysis of integrated stratigraphic data from the South Venice corehole, Sarasota County, Florida
No abstract available.
Authors
G. Lynn Brewster-Wingard, S.D. Weedman, T.M. Scott, Lucy E. Edwards, R.C. Green
Palynomorph biostratigraphy of Eocene samples from the Sagavanirktok Formation at Franklin Bluffs, North Slope of Alaska Palynomorph biostratigraphy of Eocene samples from the Sagavanirktok Formation at Franklin Bluffs, North Slope of Alaska
No abstract available.
Authors
Norman O. Frederiksen, Lucy E. Edwards, T. D. Fouch, L. D. Carter, T. S. Collett
Digital bedrock geologic map of the Mount Holly and Ludlow quadrangles, Vermont Digital bedrock geologic map of the Mount Holly and Ludlow quadrangles, Vermont
No abstract available.
Authors
Gregory J. Walsh, Nicholas M. Ratcliffe, John B. Dudley, Thomas Merrifield
Digital bedrock geologic map of the Mount Holly and Ludlow quadrangles, Vermont: Database Digital bedrock geologic map of the Mount Holly and Ludlow quadrangles, Vermont: Database
No abstract available.
Authors
Gregory J. Walsh, Nicholas M. Ratcliffe, John B. Dudley, Thomas Merrifield
Calcareous nannofossils from Paleogene deposits in the Salt Range, Pakistan Calcareous nannofossils from Paleogene deposits in the Salt Range, Pakistan
No abstract available.
Authors
Laurel M. Bybell, Jean Self-Trail
The Manson Impact Structure: 40Ar/39Ar age and its distal impact ejecta in the Pierre Shale in southeastern South Dakota The Manson Impact Structure: 40Ar/39Ar age and its distal impact ejecta in the Pierre Shale in southeastern South Dakota
The 40Ar/39Ar ages of a sanidine clast from a melt-matrix breccia of the Manson, Iowa, impact structure (MIS) indicate that the MIS formed 73.8 ± 0.3 million years ago (Ma) and is not coincident with the Cretaceous-Tertiary boundary (64.43 ± 0.05 Ma). The MIS sanidine is 9 million years older than 40Ar/39Ar age spectra of MIS shock-metamorphosed microcline and melt-matrix breccia...
Authors
G. A. Izett, W. A. Cobban, J. Obradovich, Michael J. Kunk