Upper Ordovician microphytoplankton of the Bill's Creek Shale and Stonington formation, Upper Penninsula of Michigan, U.S.A.: Biostratigraphy and paleogeographic significance

Wicander, Reed and Playford, Geoffrey (2008) Upper Ordovician microphytoplankton of the Bill's Creek Shale and Stonington formation, Upper Penninsula of Michigan, U.S.A.: Biostratigraphy and paleogeographic significance. Revue de micropaleontologie, 51 1: 39-66. doi:10.1016/j.revmic.2007.01.001


Author Wicander, Reed
Playford, Geoffrey
Title Upper Ordovician microphytoplankton of the Bill's Creek Shale and Stonington formation, Upper Penninsula of Michigan, U.S.A.: Biostratigraphy and paleogeographic significance
Journal name Revue de micropaleontologie   Check publisher's open access policy
ISSN 0035-1598
1873-4413
Publication date 2008-01
Year available 2007
Sub-type Article (original research)
DOI 10.1016/j.revmic.2007.01.001
Volume 51
Issue 1
Start page 39
End page 66
Total pages 28
Place of publication Cedex, France
Publisher Elsevier Masson
Collection year 2009
Language eng
fre
Subject C1
970104 Expanding Knowledge in the Earth Sciences
040311 Stratigraphy (incl. Biostratigraphy and Sequence Stratigraphy)
Abstract An abundant, diverse, and well-preserved organic-walled microphytoplankton assemblage is described from the Upper Ordovician Bill's Creek Shale and the lower Stonington Formation (Bay de Noc Member) in the Upper Peninsula of Michigan, U.S.A. Based on graptolite and conodont evidence, the Bill's Creek Shale and Stonington Formation are Richmondian (=Ashgill) in age. The assemblage is dominated by acritarchs, which comprise 29 species (including the enigmatic palynomorph Gloeocapsomorpha prisca) assigned to 20 genera. The prasinophyte phycomata are represented by undifferentiated species of Leiosphaeridia and Tasmanites. In addition, chitinozoans are abundant, and scolecodonts and graptolite fragments are common. Paleontologic-palynologic and sedimentologic evidence indicates that the Bill's Creek Shale was deposited in a low-energy, shallow, nearshore marine environment. The overlying Bay de Noc Member of the Stonington Formation also accumulated in a low-energy, normal marine environment, but in a more offshore, somewhat deeper water setting. Both formations experienced minor transgressive and regressive episodes as indicated by fluctuations in the composition of the palynoflora. The combined Bill's Creek/Stonington acritarch assemblage closely resembles those described from the Richmondian-aged Maquoketa Shale (Missouri and Kansas), Sylvan Shale (Oklahoma), and Vauréal Formation (Anticosti Island, Québec, Canada). The overall composition of the acritarch assemblage from these four formations reflects a distinctive, recognizably Laurentian character. Nonetheless, many of the Bill's Creek/Stonington acritarchs have been reported from Upper Ordovician localities elsewhere, providing additional evidence for Late Ordovician cosmopolitanism of the marine microphytoplankton community. Additionally, the restricted stratigraphic range of many of the taxa further enhances their biostratigraphic application, both regionally and globally, and reaffirms the Richmondian (=Ashgill) age of the Bill's Creek Shale and Stonington Formation.
Keyword Acritarchs
Bill's Creek Shale
Biostratigraphy
Paleoenvironment
Paleogeography
Stonington Formation
Upper Ordovician
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes Issue title: Palaeozoic palynology and micropalaeontology: applications in stratigraphy and palaeoecology - Part I

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Earth Sciences Publications
 
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Created: Sun, 19 Apr 2009, 16:21:39 EST by Ms Christine Sinclair on behalf of School of Earth Sciences