North-Central Section (44th Annual) and South-Central Section (44th Annual) Joint Meeting (11–13 April 2010) | |
Paper No. 29-9 |
Presentation Time: 1:30 PM-5:00 PM | ||
LOBSTER–BEARING CONCRETION FORMATION IN THE BEARPAW SHALE (LATE CRETACEOUS) OF MONTANA | ||
FELDMANN, Rodney M.1, FRANTESCU, Adina2, FRANTESCU, Ovidiu D.2, KLOMPMAKER, Adiel2, LOGAN, Greg Jr2, ROBINS, Cristina M.2, and WAUGH, David A.1, (1) Department of Geology, Kent State University, Kent, OH 44242, rfeldman@kent.edu, (2) Department of Geology, Kent State University, Kent, OH 44242 Concretions collected from the Late Cretaceous Bearpaw Shale near Fort Peck, northeastern Montana, have been known to bear well-preserved specimens of the nephropid lobster Palaeonephrops browni (Whitfield, 1907) since the site was first collected by Barnum Brown in 1906. Based upon megascopic examination, Feldmann et al. (1977) described them as argillaceous limestone concretions. Six additional concretions form the basis for a more detailed taphonomic study. Five of the six concretions have not been prepared to expose the lobsters. They were destructively sampled and were studied using polished surfaces, acetate peels, thin sections, and SEM techniques. Composition of the concretions was determined by employing XRD, XRF, and EDS techniques on various parts of the concretions and on insoluble residue samples of sediment within and surrounding the lobsters. The concretions were confirmed to be calcareous, rather than phosphatic as described by Tsujita (2003) from concretions in the Bearpaw Shale in | ||
North-Central Section (44th Annual) and South-Central Section (44th Annual) Joint Meeting (11–13 April 2010)
General Information for this Meeting | ||
Session No. 29--Booth# 31 General Paleontology (Posters) Branson Convention Center: Taneycomo A 1:30 PM-5:00 PM, Monday, 12 April 2010 Geological Society of America Abstracts with Programs, Vol. 42, No. 2, p. 83 | ||
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