Publications
Filter Total Items: 829
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
Preliminary analysis of integrated stratigraphic data from the Phred #1 corehole, Indian River County, Florida
No abstract available.
Authors
S.D. Weedman, T.M. Scott, Lucy E. Edwards, G. L. Brewster-Wingard, J.C. Libarkin
Map showing bedrock surface topography, bedrock outcrops, and areas of shallow bedrock in the northern sheet, New Jersey
No abstract available.
Authors
Byron D. Stone, Scott D. Stanford, Ron W. Witte
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
U-Pb ages of metarhyolites of the Catoctin and Mount Rogers formations, central and southern Appalachians: Evidence for two pulses of Iapetan rifting
No abstract available.
Authors
John N. Aleinikoff, Robert E. Zartman, Marianne Walter, Douglas W. Rankin, Peter T. Lyttle, William C. Burton
Sedimentary patterns across the Paleocene-Eocene boundary in the Atlantic and Gulf Coastal Plains of the United States
Fossiliferous clay and sand belonging to calcareous nannofossil Zones NP 9 (latest Paleocene) and NP 10 (earliest Eocene) are widespread in the US Gulf and Atlantic Coastal Plains. Although the thickness of Zone NP 9-NP 10 strata is several times greater in the eastern Gulf Coastal Plain than in the Atlantic Coastal Plain, the hiatus that usually is present between these two zones in inner neritic
Authors
Thomas G. Gibson, Laurel M. Bybell
The scientific assessment and strategy team contributions assessing the 1993 flood on the Mississippi and Missouri River basins
The Scientific Assessment and Strategy Team was formed to provide scientific advice and assistance to federal officials responsible for making decisions with respect to flood recovery in the Upper Mississippi River Basin (above Cairo, Illinois) as a result of the 1993 flooding. The team assembled data from a wide variety of sources within federal, state, and local governments, and the private sect
Authors
Gary E. Freeman, S. K. Nanda, M. J. Mausback, Ronald E. Erickson, John A. Kelmelis, Byron D. Stone, William H. Kirby, James R. Reel