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Paleoecology of a late Eocene mobile rockground biota from North Otago, New Zealand

Daphne E. Lee, Joachim Scholz and Dennis P. Gordon
Paleoecology of a late Eocene mobile rockground biota from North Otago, New Zealand
Palaios (December 1997) 12 (6): 568-581


A distinctive mobile pebble and cobble rockground biota of Late Eocene age is described from volcaniclastic sediments between Oamaru and Kakanui, North Otago, New Zealand. Thousands of subangular to subrounded basaltic pebbles and cobbles are encrusted with a diverse range of very well-preserved epibionts including crustose coralline algae, serpulids, bivalves, foraminifera, brachiopods, and more than 70 species of cyclostome and cheilostome bryozoans. The preservation of thin sediment layers beneath and between encrusting bryozoan colonies indicates the probable occurrence, during life, of agglutinating microbial mats. The abundance of subspherical rhodoliths, the diversity of epibionts, and their occurrence on all faces of the volcanic clasts reflect intermediate levels of overturning and rolling in a moderately current-swept channel adjacent to small volcanic islands and seamounts. The occurrence of large foraminifera (Asteroclyna), bryozoans (including two extant species), and brachiopods with warm-water affinities indicates subtropical sea temperatures and water depths of 25-50 m for this community, which represents one of the few described Cenozoic examples of a mobile rockground biota.

ISSN: 0883-1351
Serial Title: Palaios
Serial Volume: 12
Serial Issue: 6
Title: Paleoecology of a late Eocene mobile rockground biota from North Otago, New Zealand
Affiliation: University of Otago, Department of Geology, Dunedin, New Zealand
Pages: 568-581
Published: 199712
Text Language: English
Publisher: Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States
References: 43
Accession Number: 1998-023980
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. block diag., 4 tables, geol. sketch map
S45°15'00" - S45°15'00", E171°00'00" - E171°00'00"
Secondary Affiliation: University of Hamburg, DEU, Federal Republic of GermanyNational Institute of Water and Atmospheric Research, NZL, New Zealand
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by Institute of Geological and Nuclear Sciences Limited (GNS Science), Lower Hutt, New Zealand
Update Code: 199809
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