Title

Geology of the Nelson Limestone, Postel Nunatak, Patuxent Range, Antarctica

Abstract

Postel Nunatak in the Patuxent Range has been previously mapped as Nelson Limestone but there was no biostratigraphic support for that interpretation until now. We confirm that limestone exposures at Postel Nunatak are at least partly correlated with the Nelson Limestone of the Neptune Range, 160 km north-east, and are not correlative with the lower Cambrian Schneider Hills Limestone of the Argentina Range. Upper beds have yielded the trilobites Suludella? davnii Palmer & Gatehouse, 1972 and Solenopleura pruina Palmer & Gatehouse, 1972, which provide a basis for assignment to Cambrian Series 3 (late middle Cambrian), within the Drumian or lower Guzhangian stages. Limestone beds were deposited in a shallow marine setting, ranging from supratidal to lagoonal facies with rare subtidal intervals. These settings contrast with deeper water facies of the Neptune Range. Despite limitations in sampling density, isotopic analysis indicates that a greater than +2.5‰ shift in δ13C is consistent with δ13C trends documented for the Drumian Stage. Because the upper and lower contacts at Postel Nunatak are covered by snow and ice, the relationship with rocks mapped as the Patuxent Formation in the Patuxent Range remains uncertain, but part of it may belong to the Precambrian Hannah Ridge Formation.

Department(s)

Geography, Geology, and Planning

Document Type

Article

DOI

https://doi.org/10.1017/s0954102017000396

Keywords

Hannah Ridge Format, ionmiddle cambrian, Nelson limestone, patuxent formation, Pensacola mountains, series 3

Publication Date

2017

Recommended Citation

Evans, Kevin Ray, Lawrence W. McKenna, Bruce S. Lieberman, Wesley Donald Weichert, and Kenneth G. Macleod. "Geology of the Nelson Limestone, Postel Nunatak, Patuxent Range, Antarctica." Antarctic Science 30, no. 1 (2018): 29-43.

Journal Title

Antarctic Science

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