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Limestone concretion growth documented by trace-fossil relations

Charles E. Savrda and David J. Bottjer
Limestone concretion growth documented by trace-fossil relations
Geology (Boulder) (October 1988) 16 (10): 908-911


A concretionary limestone bed and subjacent black laminated shales examined within the upper part of the Jurassic Posidonienschiefer in the Holzmaden area of southern Germany contain trace fossils that are derived exclusively from an overlying bioturbated green claystone bed that reflects a short episode of oxygenation. The character and systematic distribution of trace-fossil assemblages, which include Chondrites, Thalassinoides, and Rhizocorallium, provide a record of depth and timing of syngenetic concretionary limestone growth that is more precise than growth histories provided by more traditional physical and geochemical criteria. Ichnologic evidence indicates that concretion growth began at isolated nuclei at or just below the sediment-water interface just prior to or contemporaneous with the onset of the oxygenation episode. Concretion growth progressed downward and laterally from these nuclei during and after minor compaction but was essentially complete before the termination of the oxygenation event at a depth less than 1 m below the sea floor. The temporal association of this concretion growth with the oxygenation episode implies a genetic relation that warrants further investigation of the significance of bottom-water oxygenation fluctuations for the formation of other concretionary limestones in the stratigraphic record.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 16
Serial Issue: 10
Title: Limestone concretion growth documented by trace-fossil relations
Affiliation: Auburn Univ., Dep. Geol., Auburn, AL, United States
Pages: 908-911
Published: 198810
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 22
Accession Number: 1988-071113
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch map
Secondary Affiliation: Univ. South. Calif., USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1988
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