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Geology; February, 2008; v. 36; no. 2; p. 151-154; DOI: 10.1130/G24280A.1
© 2008 Geological Society of America
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Caribbean chronostratigraphy refined with U-Pb dating of a Miocene coral

Rhawn F. Denniston*,1, Yemane Asmerom2, Victor Y. Polyak2, Donald F. McNeill3, James S. Klaus3, Peter Cole4 and Ann F. Budd5

1 Department of Geology, Cornell College, 600 1st Street West, Mount Vernon, Iowa 52314, USA
2 Department of Earth and Planetary Science, Northrop Hall, University of New Mexico, Albuquerque, New Mexico 87131, USA
3 Division of Marine Geology and Geophysics, Rosenstiel School, University of Miami, 4600 Rickenbacker Causeway, Miami, Florida 33149, USA
4 Department of Geology, Cornell College, 600 1st Street West, Mount Vernon, Iowa 52314, USA
5 Department of Geoscience, Trowbridge Hall, University of Iowa, Iowa City, Iowa 52242, USA

An exceptionally well-preserved aragonitic coral of the extinct species Goniopora hilli was collected from late Cenozoic sedimentary deposits in the Dominican Republic and dated using U-Pb techniques. Nine coralline subsamples yielded a 238U/206Pb–207Pb/206Pb three-dimensional (3-D) inverse linear concordia age of 5.52 ± 0.15 (2{sigma}) Ma, which, when coupled with 87Sr/86Sr ratios obtained from the same coral, allows for tighter constraints on temporal variability of marine species diversity prior to closure of the Central American Seaway. The recognition that pre-Quaternary aragonitic corals can be suitable for U-Pb dating creates new possibilities for refining the chronologies of late Cenozoic marine sedimentary sequences.

Key Words: coral • U-Pb • Dominican Republic • Miocene • Central American Seaway • Sr chemostratigraphy






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