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LATE CRETACEOUS CHRONOSTRATIGRAPHY: SK1 CORE SONGLIAO BASIN, CHINA

RUDISTS OF TIBET AND THE TARIM BASIN, CHINA: SIGNIFICANCE TO REQUIENIIDAE PHYLOGENY

NUMERICAL AGE CALIBRATION OF THE ALBIAN-CENOMANIAN BOUNDARY 2009.pdf

GONZALEZ et al MURAL SONORA 2009.pdf

OBOH-IKUENOBE et al ALBIAN-CENOMANIAN DINOS 2007.pdf

OBOH-IKUENOBE et al ALBIAN-CENOMANIAN WI SL 2008.pdf

SCOTT et al NTx ALBIAN- CENOMANIAN 2003.pdf

SCOTT ACTA GEOL SINICA ALBIAN-CENOMANIAN 2008.pdf

SCOTT UPPER ALBIAN CG A03 2009.pdf

WAITE et al GCAGS 2007.pdf

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Robert W. Scott is president of Precision Stratigraphy Associates, which provides quantitative solutions to stratigraphic problems and training in sequence stratigraphy. He is also an adjunct faculty member of the Department of Geosciences, The University of Tulsa. Dr. Scott was a research geologist at Amoco Production Company for twenty years. During this time he conducted stratigraphic and paleontologic studies of Mesozoic and Cenozoic rocks worldwide. He supervised stratigraphic teams and applied two-dimensional forward models to the stratigraphic fill of basins. Prior to joining Amoco, he taught geology for eight years, first at the Waynesburg College, Pennsylvania and then at the University of Texas at Arlington. His Ph.D. research at the University of Kansas was on Early Cretaceous paleocommunities and stratigraphy in the U.S. Western Interior and he earned the Masters and Bachelors degrees at the University of Wyoming. He has more than 130 published papers and abstracts, and has served on several SEPM committees and research groups, served as secretary-treasurer of the Society for Sedimentary Geology (SEPM), and as an officer of the SEPM Foundation and of the Tulsa Geological Society. His current research is compiling a Cretaceous chronstratigraphic database and applying it to interdisciplinary international team research on Cretaceous oceanic red beds. He directs student research on carbonate reservoirs and paleontology.

Positions:
University of Tulsa Research Associate 1995 - Present
Precision Stratigraphy Associates President 1994 - Present
Amoco Corporation Various positions 1974 - 1994
University of Texas at Arlington Assistant Professor 1970 - 1974
Waynesburg College Assistant Professor 1966 - 1970
Kansas University Teaching & Research Assistant 1961 - 1966

Professional Activities:
AAPG Member since 1964
SEPM member since 1980
Co-founder & chair of Cenozoic Reef Research Group 1980 - 82
Continuing Education Committee 1981 - 1984
SEPM Secretary-Treasurer 1985 - 1987
Headquarters & Business committee 1985 - 1990
SEPM Foundation Secretary 1986 - 1991
SEPM Foundation President 1991 - 1992
SEPM Investment Committee 1994 - 2008
SEPM Research Concepts Committee 1997 - 1998
Co-chair of Carbonate Platform Working Group of Cretaceous Resources, Events and Rhythms Program 1992 - 2000
Co-chair of High Resolution Stratigraphy Research Group 1998 - 2005
Associate editor of Palaios: 1989 - 2002
Associate editor of AAPG Bulletin: 2005 - 2008
Tulsa Geological Society Finance Committee 2005 - 2008

Awards:
2003 The University of Kansas Erasmus Haworth Distinguished Alumni Honors in Geology
2005 SEPM Honorary Membership
2006 Guest Professor, China University of Geosciences (Beijing)
2007 Guest Professor, University of Vienna

 

Current Research

The Cretaceous Chronostratigraphic Database - CRETCSDB1 is a compilation of more than 3400 fossil taxa and marker beds calibrated to a numerical mega-annum scale (Fig. 1). These events are integrated from numerous published worldwide sections that span from the Jurassic/Cretaceous boundary to the Cretaceous/Paleogene boundary (Appendix 1).  The numerical ages of the ranges have been interpolated by graphic correlation of the sections listed in (Appendix 2).  The ranges of first and last occurrences (FO/LO) are presented in mega-annums calibrated to Global Stratotype and Section Points or to standard reference sections where GSSPs are not yet designated (Appendix 3).  The ages of the taxa and marker beds are preliminary because ranges of some taxa are constrained by very few sections so that their ages may extend as new sections are added to the database. (read more)

We announce the completion of the Cretaceous Chronostratigraphic Database - CRETCSDB.1, that integrates ammonites, foraminifers, nannofossils, dinoflagellates, and other selected bioevents with magnetochrons, radiometrically dated beds, geochemical events, and sequence stratigraphic horizons in a numeric age scale. More than 150 locales and more than 3000 events compose this database. The middle to Late Cretaceous part of this database is available on this website as MIDK42, which was prepared for the upcoming SEPM Special Publication 91 on Cretaceous Oceanic Redbeds. The complete database will be uploaded to this site soon.

Dr. Scott was involved in planning the final meeting of IGCP 555 "Rapid Environmental/Climate Change in the Cretaceous Greenhouse World: Ocean-Land Interactions." This international collaboration between Chinese and Western geologists will meet at the October 2010 Geological Society of America convention in Denver. The completely cored Cretaceous lacustrine section in the Songliao Basin, China, will be compared to the Western Interior mixed marine to brackish epicontinental seaway.

The collaborative study of the middle Cretaceous section in the U.S. Western Interior funded by the National Science Foundation was completed in 2005. A number of papers report the results and can be downloaded from this website. The latest Albian-earliest Cenomanian multiple sea-level rises deposited brackish to marine lithofacies and shoreline trends are delineated by palynofacies. The sequence stratigraphic framework of this interval in Montana, Wyoming, Colorado, western Kansas, western Oklahoma, and northeastern New Mexico correlate with the upper part of the Washita Group in North Texas. One unexpected result is that the cosmopolitan dinoflagellates correlate the Albian-Cenomanian boundary defined in France with the Clay Spur Bentonite Bed, which was dated at 97.17+/-0.69 Ma by J.D. Obradovich.

Collaboration with Dr. Carlos Gonzalez-Leon at the Instituto de Geologia, Hermosillo, Mexico, resulted in detailed correlation of the Aptian-Albian section in Sonora with that in Arizona and Texas. A new radiometric date is related to Upper Aptian ammonites.

Study of cores of the Albian section at the Texas shelf margin and of Permian sections continues.

RUDISTS OF TIBET AND TARIM BASIN, CHINA: Significance Of Requieniidae Phylogeny

ABSTRACT—Rudists are a principal biotic component of Cretaceous carbonates in Tibet and in the Western Tarim Basin. Barremian to Maastrichtian carbonate units are widespread on the northern margin of the Indian Plate and in Tethyan tectonic slices that were welded onto Eurasia in successive stages during the Late Cretaceous and Paleogene. In far northwestern Tibet, Barremian-Cenomanian endemic rudists and cosmopolitan orbitolinid foraminifera occupied isolated carbonate platforms in the eastern Tethys. Rudists, corals, and stromatoporoids composed bioherms up to 10 m thick and several kilometers in lateral extent. A unique endemic requieniid rudist, Rutonia, is compared to morphologically similar but older, less derived genera. (read more)