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Early taphonomy and significance of naturally submerged Nautilus shells from the New Caledonia region

Royal H. Mapes, Neil H. Landman, Kirk Cochran, Claire Goiran, Bertrand Richer de Forges and Alisha Renfro
Early taphonomy and significance of naturally submerged Nautilus shells from the New Caledonia region
Palaios (September 2010) 25 (9): 597-610

Abstract

The discovery of 11 Nautilus macromphalus shells in marine environments near New Caledonia constitutes the first opportunity for taphonomic analysis of empty shells of unburied, externally shelled cephalopods on the seafloor. Radiometric dating indicates specimen ages range from 14 to 42 years. These modern specimens provide a unique opportunity to examine the early, preburial taphonomy of this group of animals including shell condition, radiometric-age dating, epizoan encrustation, color degradation, and sediment infilling. The following conclusions are made: (1) given the limited sample available for study and assuming equal conditions where shells rested on the seafloor, the length of time the shell is unburied will not control the degree of epizoan encrustation or the external shell appearance; (2) shell boring is a major destructive process that probably impacts the potential of the shells to become fossilized; and (3) shells in the photic zone are impacted differently than those dredged from a deep water environment below the photic zone. A major part of this difference is probably the result of both boring and encrusting organisms, especially algae. By comparison, fossil cephalopods as a general group can be expected to vary considerably from the modern specimens because of evolutionary patterns of associated organisms, geographic distribution, and different environments with different paleoecological parameters through time. Caution in overreliance on the taphonomy of these modern shells should be exercised because of the limited sample of Nautilus specimens recovered. The need for additional taphonomic studies of modern externally shelled cephalopods with the recovery of more specimens from the marine environment is highly desirable.


ISSN: 0883-1351
Serial Title: Palaios
Serial Volume: 25
Serial Issue: 9
Title: Early taphonomy and significance of naturally submerged Nautilus shells from the New Caledonia region
Affiliation: Ohio University, Department of Geological Sciences, Athens, OH, United States
Pages: 597-610
Published: 201009
Text Language: English
Publisher: Society for Sedimentary Geology, Tulsa, OK, United States
References: 68
Accession Number: 2010-081078
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: NSF grants EAR-0125314 and EAR-0125479
Illustration Description: illus. incl. 1 table, sketch map
S23°00'00" - S22°00'00", E166°30'00" - E167°30'00"
S21°30'00" - S19°30'00", E160°00'00" - E161°00'00"
Secondary Affiliation: American Museum of Natural History, USA, United StatesState University of New York at Stony Brook, USA, United StatesUniversite de la Nouvelle-Caledonie, NCL, New CaledoniaInstitut de Recherche Pour le Developpement, NCL, New Caledonia
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 201043
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