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Copepod mandible palynomorphs from the Nolichucky Shale (Cambrian, Tennessee); implications for the taphonomy and recovery of small carbonaceous fossils

Thomas H. P. Harvey and Brian E. Pedder
Copepod mandible palynomorphs from the Nolichucky Shale (Cambrian, Tennessee); implications for the taphonomy and recovery of small carbonaceous fossils
Palaios (May 2013) 28 (5): 278-284

Abstract

The recent discovery of crustacean body parts among small carbonaceous fossils (SCFs) has expanded the known range of Cambrian arthropods to include comparatively derived taxa, including copepods. However, the potential for SCFs to reveal larger-scale patterns in Cambrian crustacean evolution has been unclear, because of the small number of known occurrences. Previously, Cambrian copepods were represented solely by isolated mandibles (jaws) from the Deadwood Formation of Saskatchewan, Canada (middle to late Cambrian; = Series 3 to Furongian). Herein we report a second occurrence of Cambrian copepod mandibles, of closely comparable morphology, from the approximately coeval Nolichucky Shale of Tennessee, United States. The Nolichucky specimens were recovered using standard palynological processing, whereas the larger and more articulated Deadwood specimens were recovered using a low-manipulation procedure designed for SCFs. The two datasets represent largely distinct but complementary views onto a taphonomic continuum. In general, larger and more delicate crustacean SCFs reveal phylogenetically and ecologically informative characters, but are likely to be restricted in space and time, and are often low in abundance. In contrast, robust fragments of the same body parts are more likely to be preserved and recovered, but may be unidentifiable in the absence of SCFs. Therefore, conventionally recovered palynomorphs can expand the utility of SCFs to offer a higher-fidelity account of broad-scale evolutionary patterns.


ISSN: 0883-1351
Serial Title: Palaios
Serial Volume: 28
Serial Issue: 5
Title: Copepod mandible palynomorphs from the Nolichucky Shale (Cambrian, Tennessee); implications for the taphonomy and recovery of small carbonaceous fossils
Affiliation: University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom
Pages: 278-284
Published: 201305
Text Language: English
Publisher: Society for Sedimentary Geology, Tulsa, OK, United States
References: 37
Accession Number: 2013-055654
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch map
N52°00'00" - N54°00'00", W109°00'00" - W107°00'00"
N36°22'00" - N36°22'00", W83°25'60" - W83°25'60"
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: 201334
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