Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Organic-walled microfossil assemblages from glacial and interglacial Neoproterozoic units of Australia and Svalbard

Leigh Anne Riedman, Susannah M. Porter, Galen P. Halverson, Matthew T. Hurtgen and Christopher K. Junium
Organic-walled microfossil assemblages from glacial and interglacial Neoproterozoic units of Australia and Svalbard
Geology (Boulder) (November 2014) 42 (11): 1011-1014

Abstract

Before the onset of the Neoproterozoic Snowball Earth glaciations, eukaryotes had begun diversifying, and in their aftermath, macroscopic life, including both animals and macroalgae, became abundant and widespread. Although glacially driven mass extinctions have been hypothesized, little is known about the biosphere during and between these glaciations. Here we present new data from organic-walled microfossil assemblages from five successions in Australia and Svalbard that collectively span the first (Sturtian) glaciation and interglacial interval and integrate them with data derived from a critical evaluation of the literature to produce a new estimate of eukaryotic diversity from 850 to 650 Ma. These new glacial and interglacial assemblages consist of only smooth-walled spheroids (leiosphaerids), aggregates of cells, and filaments, in contrast to the much more diverse organic-walled microfossil assemblages found in early Neoproterozoic rocks. This contrast is not attributed to biases in deposition or preservation, but is instead interpreted as reflecting an interval of lowered eukaryotic diversity that spanned the glaciations and that may have begun millions of years prior to their onset.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 42
Serial Issue: 11
Title: Organic-walled microfossil assemblages from glacial and interglacial Neoproterozoic units of Australia and Svalbard
Affiliation: University of California, Santa Barbara, Department of Earth Science, Santa Barbara, CA, United States
Pages: 1011-1014
Published: 201411
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 37
Accession Number: 2014-105180
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2014353
Illustration Description: illus. incl. sketch maps
S44°00'00" - S10°00'00", E113°00'00" - E154°00'00"
N74°25'00" - N81°00'00", E10°03'00" - E30°00'00"
Secondary Affiliation: McGill University, CAN, CanadaNorthwestern University, USA, United StatesSyracuse University, USA, United States
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 the Geological Society of America, Boulder, CO, United States
Update Code: 201452
Close Modal

or Create an Account

Close Modal
Close Modal