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Ediacarian sponge spicule clusters from southwestern Mongolia and the origins of the Cambrian fauna

Martin D. Brasier, Owen Green and Graham Shields
Ediacarian sponge spicule clusters from southwestern Mongolia and the origins of the Cambrian fauna
Geology (Boulder) (April 1997) 25 (4): 303-306

Abstract

Carbon and strontium isotopic data are used to show that the earliest sponge spicule clusters and associated phosphatic sediments (with Anabarites) from southwestern Mongolia are of Ediacarian age. Spicule morphologies include bundles of oxeas arranged in three-dimensional quadrules, linked together at junctions by tetracts, pentacts, hexacts, or polyactines. All are referred to the Phylum Porifera, Class Hexactinellida. These sponge spicules provide the oldest remains that can be assigned without question to an extant phylum, and also the first firm evidence for filter feeding and metazoan silica biomineralization in the fossil record. It is suggested that siliceous and phosphatic members of the "Cambrian fauna" may have had their origins in eutrophic and outer shelf facies of the Late Proterozoic.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 25
Serial Issue: 4
Title: Ediacarian sponge spicule clusters from southwestern Mongolia and the origins of the Cambrian fauna
Affiliation: Oxford University, Department of Earth Sciences, Oxford, United Kingdom
Pages: 303-306
Published: 199704
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 42
Accession Number: 1997-041007
Categories: StratigraphyInvertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N42°00'00" - N52°00'00", E87°00'00" - E120°00'00"
Secondary Affiliation: ETH-Zentrum, Zurich, CHE, Switzerland
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 199715
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