Publications
Filter Total Items: 823
Paleozoic and Mesozoic rocks of Mount Ichabod and Dorsey Canyon, Elko County, Nevada: Evidence for post-Early Triassic emplacement of the Roberts Mountains and Golconda allochthons
No abstract available.
Authors
Keith B. Ketner, Benita L. Murchey, Robert G. Stamm, Bruce R. Wardlaw
Middle Eocene intrusive igneous rocks of the central Appalachian Valley and Ridge province - Setting, chemistry, and implications for crustal structure
No abstract available.
Authors
C. Scott Southworth, Karen J. Gray, John F. Sutter
A detailed taxonomy of Upper Cretaceous and lower Tertiary Crassatellidae in the eastern United States: An example of the nature of extinction at the boundary
Current theories on the causes of extinction at the Cretaceous-Tertiary boundary have been based on previously published data; however, few workers have stopped to ask the question, 'How good is the basic data set?' To test the accuracy of the published record, a quantitative and qualitative analysis of the Crassatellidae (Mollusca, Bivalvia) of the Gulf and Mid-Atlantic Coastal Plains of the Unit
Authors
G. Lynn Wingard
Contrasting P‐T‐t paths: Thermochronologic evidence for a Late Paleozoic final assembly of the Avalon Composite Terrane in the New England Appalachians
Strongly contrasting pressure‐temperature‐time paths for the Avalon composite terrane and the structurally overlying Putnam‐Nashoba zone in eastern New England obtained from thermochronologic and thermobarometric data are best explained by a late Paleozoic underthrusting of cover rocks by the Avalon composite terrane. We present new Ar and U‐Pb thermochronologic data that show that in the southern
Authors
R. P. Wintsch, J. F. Sutter, Michael J. Kunk, John N. Aleinikoff, Michael J. Dorais
Closure of the Isthmus of Panama: The near-shore marine record of Costa Rica and western Panama
The final closure of the Isthmus of Panama at ∼3.5 Ma divided the American tropical ocean into two separate and different oceanographic regions. Consequences for the marine biota were profound, but, hitherto, correlation of the Pacific and Caribbean coastal sections has not been precise enough to track biologic patterns. We present here a correlation of 31 sections from the Pacific and Caribbean c
Authors
Anthony G. Coates, Jeremy B. C. Jackson, Laurel S. Collins, Thomas M. Cronin, Harry J. Dowsett, Laurel M. Bybell, Peter Jung, Jorge Obando
Alleghanian development of the Goat Rock fault zone, southernmost Appalachians: Temporal compatibility with the master decollement
The Goat Rock and associated Bartletts Ferry fault zones, which mark the eastern margin of the Pine Mountain Grenville basement massif, are controversial due to the suggestion that they are rare exposed segments of the late Paleozoic southern Appalachian master decollement. The controversy in part stems from reported middle Paleozoic (Acadian) radiometric dates postulated as the time of movement a
Authors
Mark G. Steltenpohl, S. Goldberg, T.B. Hanley, Michael J. Kunk
Calibration of the latest Eocene-Oligocene geomagnetic polarity time scale using 40 Ar/ 39 Ar dated ignimbrites
A discontinuous record of late Eocene-Oligocene geomagnetic polarity has been determined using high-precision (±<0.15 m.y.) 40Ar/39Ar sanidine dating and a paleomagnetic study of 37-27 Ma ignimbrites in New Mexico, Colorado, and Texas. This record provides age control for several geomagnetic polarity reversals that occurred during three periods of intense ignimbrite volcanism: 36.8-33.5 Ma, 32.7-3
Authors
W. C. McIntosh, J. W. Geissman, C.E. Chapin, Michael J. Kunk, Christopher D. Henry
Hydrogeology of thick till deposits in Connecticut
No abstract available.
Authors
Robert L. Melvin, Byron D. Stone, J. R. Stone, N.J. Trask
Paleocene and Eocene strata of the central Atlantic Coastal Plain
No abstract available.
Authors
Thomas G. Gibson, Laurel M. Bybell, David L. Govoni
Calcareous nannofossils and foraminifers from Paleocene and Eocene strata in Maryland and Virginia
No abstract available.
Authors
Laurel M. Bybell, Thomas G. Gibson
Potomac River Paleocene and Eocene stop descriptions
No abstract available.
Authors
Thomas G. Gibson, Laurel M. Bybell
Paleocene-Eocene boundary: Sedimentation in the Potomac River Valley, Virginia and Maryland: field trip guidebook
No abstract available.
Authors
Thomas G. Gibson, Laurel M. Bybell