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Wilson, J.P., Grotinger, J.P., Fischer, W.W., Hand, K.P., Jensen, S., Knoll, A.H., Abelson, J., Metz, J.M., McLoughlin, N., Cohen, P.A. and Tice, M.M. 2012. Deep-Water incised valley deposits at the Ediacaran-Cambrian Boundary in southern Namibia contain abundant Treptichnus Pedum. Palaios, 27(4): 252-273


Description:

Deep-Water incised valley deposits at the Ediacaran-Cambrian Boundary in southern Namibia contain abundant Treptichnus Pedum.

Summary / Notes:

Valley-filling deposits of the Nama Group, southern Namibia, record two episodes of erosional downcutting and backfill, developed close together in time near the Ediacaran-Cambrian boundary. Geochronological constraints indicate that the older valley fill began 539.4 ± 1 Ma or later; the younger of these deposits contains unusually well-preserved populations of the basal Cambrian trace fossil Treptichnus pedum. Facies analysis shows that T. pedum is closely linked to a nearshore sandstone deposit, indicating a close environmental or taphonomic connection to very shallow, mud-draped sandy seafloor swept by tidal currents. Facies restriction may limit the biostratigraphic potential of T. pedum in Namibia and elsewhere, but it also illuminates functional and ecological interpretation. The T. pedum tracemaker was a motile bilaterian animal that lived below the sediment-water interface—propelling itself forward in upward-curving projections that breached the sediment surface.

Year: 2012

Type: Journal Article

URL: http://palaios.geoscienceworld.org/content/27/4/252.abstract


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Crimes, T.P. and Germs, G.J.B. 1982. Trace fossils from the Nama Group (Precambrian-Cambrian) of southwest Africa (Namibia). Journal of Paleontology 56(4): 890–907
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1982 Journal Article
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1990DRFN DLIBBook, Book Section, Booklet73.4 mb pdf
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