Publications
Filter Total Items: 829
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
The second Lehigh Tunnel; geology and the New Austrian Tunnelling Method
No abstract available.
Authors
Jack B. Epstein, Patricia F. Buis
Pliocene paleoclimatic reconstruction using dinoflagellate cysts: Comparison of methods
The application of quantitative and semiquantitative methods to assemblage data from dinoflagellate cysts shows potential for interpreting past environments, both in terms of paleotemperature estimates and in recognizing water masses and circulation patterns. Estimates of winter sea-surface temperature (WSST) were produced by using the Impagidinium Index (II) method, and by applying a winter-tempe
Authors
Lucy E. Edwards, P.J. Mudie, A. de Vernal
Geology, geophysics, and geochronology of the Manson impact structure
A problem with the impact hypothesis for the Cretaceous/Tertiary (K/T) mass extinction is the apparent absence of an identifiable impact site. The Manson impact structure is a candidate site because of its size (the largest such structure recognized in the United States); in addition, the largest and most abundant shocked quartz grains at the K/T boundary are found relatively close by, and its age
Authors
Jack B. Hartung, Michael J. Kunk, R. R. Anderson
Eocene-Oligocene sea-level changes on the New Jersey coastal plain linked to the deep-sea record
We use magnetostratigraphy and Sr-isotope stratigraphy to improve stratigraphic control for the Eocene to Oligocene of the New Jersey coastal plain (ACGS4 borehole). Magnetostratigraphy in many cases is complicated in outcrop sections of shallow-water (<200 m paleodepth) sediments by low remanence and weathering; we minimize these problems by analyzing large samples obtained from the ACGS4 borehol
Authors
Kenneth G. Miller, Dennis V. Kent, Andrew N. Brower, Laurel M. Bybell, Mark D. Feigenson, Richard K. Olsson, Richard Z. Poore
Dinoflagellate-cyst census data from the seabed samples of Wall and others (1977) and Turon (1984)
No abstract available.
Authors
Lucy E. Edwards, Victoria A.S. Andrle
Surficial geologic map of the Townsend quadrangle, Middlesex and Worcester Counties, Massachusetts, and Hillsborough County, New Hampshire
No abstract available.
Authors
Carl Koteff, Byron D. Stone