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GEOREF RECORD

Organic-walled microphytoplankton from the Middle Devonian (Givetian) Gravel Point Formation, Michigan, USA

Reed Wicander and Geoffrey Playford
Organic-walled microphytoplankton from the Middle Devonian (Givetian) Gravel Point Formation, Michigan, USA (in Special issue in honor of Gordon D. Wood, Merrell A. Miller (editor), Thomas Servais (editor) and Reed Wicander (editor))
Palynology (November 2017) 41 (SUPPL.): 158-177

Abstract

An abundant, diverse, and moderately well-preserved assemblage of organic-walled microphytoplankton is reported from two exposures of the Middle Devonian (Givetian) Gravel Point Formation at Little Traverse Bay, Michigan. The palynoflora consists of 13 prasinophyte and 19 acritarch species, together with some scolecodonts and chitinozoans. This is the first microphytoplankton assemblage to be described from the Middle Devonian of Michigan, and is clearly Givetian in age. It is closely comparable with, albeit less diverse than, Middle Devonian acritarch/prasinophyte assemblages reported from elsewhere in North America. Based on the diversity and abundance of the acritarch and prasinophyte taxa, along with evidence from marine faunas, the Gravel Point sediments accumulated in a normal, low-energy, offshore environment, with periodic regressions indicated by stromatoporoid-coral bioherms. Four of the acritarch species are restricted to the Middle Devonian of North America; the other specific components are typically, but not exclusively, Middle Devonian in age. Although some species are restricted to North America, others are cosmopolitan in distribution.


ISSN: 0191-6122
EISSN: 1558-9188
Serial Title: Palynology
Serial Volume: 41
Serial Issue: SUPPL.
Title: Organic-walled microphytoplankton from the Middle Devonian (Givetian) Gravel Point Formation, Michigan, USA
Title: Special issue in honor of Gordon D. Wood
Author(s): Wicander, ReedPlayford, Geoffrey
Author(s): Miller, Merrell A.editor
Author(s): Servais, Thomaseditor
Author(s): Wicander, Reededitor
Affiliation: University of Queensland, School of Earth and Environmental Sciences, Brisbane, Queensl., Australia
Affiliation: IRF Group, Tulsa, OK, United States
Pages: 158-177
Published: 201711
Text Language: English
Publisher: American Association of Stratigraphic Palynologists, Dallas, TX, United States
References: 75
Accession Number: 2018-039827
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Includes appendix
Illustration Description: illus. incl. 2 plates, sketch maps
N45°34'60" - N45°34'60", W84°58'60" - W84°58'60"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Abstract, Copyright, American Association of Stratigraphic Palynologists. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2018
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