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A model for organic fossilization of the Early Cretaceous Jehol Lagerstatte based on the taphonomy of "Ephemeropsis trisetalis"

Pan Yanhong, Sha Jingeng and Franz T. Fuersich
A model for organic fossilization of the Early Cretaceous Jehol Lagerstatte based on the taphonomy of "Ephemeropsis trisetalis"
Palaios (July 2014) 29 (7): 363-377

Abstract

The taphonomic pathways of "Ephemeropsis trisetalis" nymphs (mayfly larvae) were systematically investigated based on fossils of different preservational types, collected during three high-stratigraphic-resolution (mm to cm) excavations in the Lower Cretaceous Yixian Formation in the Sihetun area of western Liaoning, China. All fossils studied are fully articulated either in three or two dimensions, which indicates that decay was terminated at a stage before the exoskeleton became disarticulated. We conclude that the Jehol organic skeletons represent at least two general types of preservation produced by pyritization and collapse/compression, respectively. The two-dimensional compressions show no evidence for authigenic minerals, but the three-dimensionally preserved fossils are wholly or partially pyritized. Our study also indicates that aluminosilicate clay and pyrite mineralization are closely associated with fossil "Ephemeropsis trisetalis" nymphs, suggesting that both clay and pyrite played important roles in lacustrine fossil preservations, as in some marine fossil Lagerstatten. We propose a general model for organic tissue fossilization in the Jehol Lagerstatte based on study of taphonomy of "Ephemeropsis trisetalis" nymphs.


ISSN: 0883-1351
Serial Title: Palaios
Serial Volume: 29
Serial Issue: 7
Title: A model for organic fossilization of the Early Cretaceous Jehol Lagerstatte based on the taphonomy of "Ephemeropsis trisetalis"
Affiliation: Chinese Academy of Sciences, Nanjing Institute of Geology and Palaeontology, State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing, China
Pages: 363-377
Published: 201407
Text Language: English
Publisher: Society for Sedimentary Geology, Tulsa, OK, United States
References: 65
Accession Number: 2014-091647
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. cols., geol. sketch map
N41°36'00" - N41°36'00", E120°49'60" - E120°49'60"
Secondary Affiliation: Friedrich-Alexander-Universitaet Erlangen-Nuernberg, DEU, Germany
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: 201447
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