Browsing by Author "Wehmiller, John F."
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Item Ages Of The Bethany, Beaverdam, And Omar Formations Of Southern Delaware(Newark, DE: Delaware Geological Survey, University of Delaware, 1990-02) Groot, J.J.; Ramsey, K.W.; Wehmiller, John F.The microflora of the Bethany formation and the lower part of the Beaverdam Formation is characterized by a Quercus-Carya assemblage, very few non-arboreal pollen, and Pterocarya and Sciadopitys as exotic constituents. This assemblage has much in common with that of the Brandywine Formation of Maryland and the Eastover Formation of Virginia which are of late Miocene or early Pliocene age. The environment of deposition of the Bethany was probably deltaic, and that of the lower Beaverdam fluviatile.Item Alegria Canyon Terrace, Santa Barbara County, California(2012-05-15) Wehmiller, John F.Alegria Canyon Terrace, west of Santa Barbara, California. Modern terrace platform at sea level; Pleistocene (MIS 5) terrace at level of railroad tracks.Item Amino acid racemization age estimates for Pleistocene marine deposits in the Eukeka-Fields Landing Area, Homboldt County, California(U.S. Department of the Interior Geological Survey, 1977) Wehmiller, John F.; Kennedy, George L.; Lajoie, Kenneth R.Amino acid enantiomeric (D/L) ratios in fossil Saxidomus samples from four localities in the Eureka - Fields Landing area of the Humboldt Bay region, California yield age estimates of 180,000 to 280,000 years for exposed and slightly deformed bay and estuarine deposits.Item Caloosa Shell Pit, Florida(2012-05-15) Wehmiller, John F.Item Cape Blanco, Oregon(2012-05-15) Wehmiller, John F.Item Cape Hatteras and Core Banks, North Carolina beach shells(2012-05-15) Wehmiller, John F.Item Cedar Neck, Sussex County, Delaware(2012-05-15) Wehmiller, John F.Item Comparison of approaches to dating Atlantic coastal plain sediments, Virginia Beach, Virginia(Washington, DC : U.S. Nuclear Regulatory Commission, 1998-03) Lamothe, Michel; Wehmiller, John F.; Noller, Jay S.Item Compilation of Florida Amino Acid Racemization Data(2014-07-24) Wehmiller, John F.Item Correlation and chronology of Pacific Coast marine terrace deposits of continental United States by fossil amino acid stereochemistry technique, evaluation, relative ages, kinetic model ages, and geologic implications(U.S. Department of the Interior Geological Survey, 1977) Wehmiller, John F.; Lajoie, Kenneth R.; Kvenvolden, Keith A.; Peterson, Etta; Belknap, Daniel F.; Kennedy, George L.; Addicott, Warren O.; Vedde, John G.; Wright, Robert W.Enantiomeric (D/L) ratios of six or more amino acids have been determined in Pleistocene mollusks from fifty-one terrace localities on the Pacific coast of the United States from Puget Sound, Washington, to San Diego, California. Samples have been selected for the purpose of evaluation of various aspects of the amino acid dating technique as well as for the application of the technique to unresolved chronologic problems. Samples with known stratigraphic relationships (upper and lower Pleistocene, Pliocene) have been examined to document the relationships between geologic age and extent of racemization. Most genera investigated exhibit the expected trend of increasing extent of racemization with increasing age, but some genera do not document this trend, probably because of contamination during diagenesis. Of all genera examined in this manner, the bivalve mollusk Saxidomus appears to be the most reliable.Item Database of Quaternary Coastal Geochronologic Information for the Atlantic and Pacific Coasts of North America (additional information for sites in Peru and Chile)(Newark, DE: Delaware Geological Survey, University of Delaware, 2015-02) Wehmiller, John F.; Pellerito, V.Open-File Report 50 presents and describes a database of geochronological information for coastal deposits of the US Atlantic and Pacific coasts, as well as for sites from the Pacific coast of South America. This database represents a synthesis of nearly forty years of study conducted by John F. Wehmiller and students in the Department of Geological Sciences, University of Delaware, as well as many collaborating colleagues. The majority of the chronological information in the database is based on amino acid racemization (AAR) data for fossil mollusks obtained from over 1000 collection sites. These chronological data have been used for various mapping, paleoenvironmental, stratigraphic, sea-level, and tectonic studies. In addition to the database itself, 18 on-line supplements containing information related to sample descriptions, sample and collection site photographs, field notes, supporting or related analytical data, and laboratory publications and technical reports are available. Periodic updates and additions will be made where appropriate. The database will be updated regularly to add new data or to complete entries that are currently blank. The instructions provided with the database indicate the date of the latest revision, as well as all revisions after the first release. Some output data from the Amino Acid Racemization Data Base (AARDB) are available at on-line mapping sites or are posted to the NOAA-World Data Center for archival preservation (http://www.ncdc.noaa.gov/paleo/aar.html).Item Davenport, California(2012-05-15) Wehmiller, John F.Item Descriptive text for Gomez Pit stratigraphy and geochronology(2013) Wehmiller, John F.Item Gomez aminozones from Wehmiller, 2013, Quaternary Geochronology(2013) Wehmiller, John F.Item Gomez locality summary(1995) Wehmiller, John F.Item Gomez Pit Site "06045", 1987 Collection(1987) Wehmiller, John F.Item Gomez Pit site "06074", 1988 collection(1988) Wehmiller, John F.Item Gomez Pit sites "06074" and "06076", 1989 collection(1989) Wehmiller, John F.Item Gomez Pit, Virginia Beach, Virginia(2012-05-15) Wehmiller, John F.Item Intracoastal Waterway, Myrtle Beach, South Carolina(2012-05-15) Wehmiller, John F.
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