Publications
Filter Total Items: 822
Using hydrogeochemical methods to evaluate complex quaternary subsurface stratigraphy Block Island, Rhode Island, USA
One of the major problems in hydrogeologic investigations of glaciated regions is the determination of complex stratigraphic relationships in the subsurface where insufficient information is available from drilling and geophysical records. In this paper, chemical characteristics of groundwater were used to identify stratigraphic changes in glacial deposits that were previously inferred on Block Is
Authors
A.I. Veeger, B. D. Stone
Preliminary analysis of down-core biotic assemblages Bob Allen Keys, Everglades National Park, Florida Bay
IntroductionA series of short piston cores (< 2m) were taken from eleven stations in Florida Bay in May, 1994 by researchers from the U.S. Geological Survey (St. Petersburg, FL., Woods Hole, MA., and Denver CO.) in cooperation with South Florida Water Management District, and the Everglades National Park, and the National Oceanic and Atmospheric Administration (NOAA). Core 6A from Bob Allen Keys (
Authors
G. L. Brewster-Wingard, S. E. Ishman, Thomas M. Cronin, Lucy E. Edwards, Debra A. Willard, R. B. Halley
Cretaceous and Paleogene calcareous nannofossil biostratigraphy of New Jersey
No abstract available.
Authors
Jean Self-Trail, Laurel M. Bybell
Stratigraphic notes, 1994: Three short papers propose changes in stratigraphic nomenclature in Virginia, Kentucky, and Alaska
No abstract available.
Authors
Jack B. Epstein, Randall C. Orndorff, Eugene K. Rader, Charles L. Rice, David A. Brew, Arthur B. Ford, Glen R. Himmelberg, James L. Drinkwater
Style and age of deformation, Carolina Slate Belt, central North Carolina
No abstract available.
Authors
Terry W. Offield, Michael J. Kunk, Robert P. Koeppen
The Pennsylvanian Fire Clay tonstein of the Appalachian basin—Its distribution, biostratigraphy, and mineralogy: Discussion and reply
No abstract available.
Authors
William Outerbridge, C. L. Rice, Harvey E. Belkin, T.W. Henry, Michael J. Kunk
Composition of biotite phenocrysts in Ordovician tephras casts doubt on the proposed trans-Atlantic correlation of the Millbrig K-bentonite (United States) and the Kinnekulle K-bentonite (Sweden)
Biotite phenocryst compositions in three thick, widespread Ordovician K-bentonites, the Deicke and Millbrig from Big Ridge, Alabama, and the Kinnekulle from Mossen, Västergötland, Sweden, fall into three distinct groups, and so the proposed intercontinental correlation of the Millbrig and the Kinnekulle is suspect. Because the biotites are nearly pristine compositionally, electron microprobe ana
Authors
John T. Haynes, W.G. Melson, Michael J. Kunk
An 40Ar/39Ar thermochronology of the Ofoten‐Troms region: Implications for terrane amalgamation and extensional collapse of the northern Scandinavian Caledonides
Fifteen 40Ar/39Ar cooling ages are reported for metamorphic hornblende and muscovite from far traveled terranes constituting the Ofoten nappe stack of northern Norway. Eight cooling ages on hornblende range from 425 to 394 Ma and seven muscovite ages, from the same or nearby outcrops as the hornblendes, range from 400 to 373 Ma. These data are compared with 40Ar/39Ar ages from over a large part of
Authors
Janet E. Coker, Mark G. Steltenpohl, A. Andersen, Michael J. Kunk
Age of the Cenomanian-Turonian boundary in the Western Interior of the United States
High precision 40Ar/39Ar laser-microprobe ages of individual sanidines,40Ar/39Ar plateau age spectra on bulk sanidine concentrates, U-Pb zircon ages, and zircon and apatite fission-track ages from three bentonites bracketing the Cenomanian-Turonian boundary in the Western Interior of the United States suggest an age for the boundary of 93.1 ± 0.3 (2σ. The lowermost bentonite comes from the Upper C
Authors
B. J. Kowallis, Eric H. Christiansen, Alan L. Deino, Michael J. Kunk, L. Heaman
Impact of the 1993 floods in the upper Mississippi River basin
No abstract available.
Authors
J. C. Dohrenwend, Byron D. Stone
Geology of the Waterford quadrangle, Virginia and Maryland, and the Virginia part of the Point of Rocks quadrangle
The bedrock geology of the Waterford quadrangle and of the Virginia part of the Point of Rocks quadrangle consists of a portion of the Middle Proterozoic basement core and its cover sequence on the eastern limb of the Blue Ridge anticlinorium and the adjacent early Mesozoic Culpeper basin. The three major rock associations in this area are: 1) Middle Proterozoic gneisses intruded by late Proterozo
Authors
William C. Burton, A. J. Froelich, J. S. Pomeroy, K. Y. Lee
Age and diagenesis of the upper Floridan Aquifer and the intermediate aquifer system in southwestern Florida
No abstract available.
Authors
Lucy McCartan, S.D. Weedman, G.L. Wingard, Lucy E. Edwards, P. J. Sugarman, M.D. Feigenson, M. L. Buursink, J.C. Libarkin