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A new insect and plant Lagerstaette from a Tertiary lake deposit along the Canyon Ferry Reservoir, southwestern Montana

Emily A. CoBabe, Kevin R. Chamberlain, Michael A. Ivie and J. Joseph Giersch
A new insect and plant Lagerstaette from a Tertiary lake deposit along the Canyon Ferry Reservoir, southwestern Montana
Rocky Mountain Geology (2002) 37 (1): 13-30

Abstract

A diverse Oligocene insect and plant Lagerstatte has been identified recently from paper shales in a sequence of fine-grained deposits exposed on the west side of Canyon Ferry Reservoir, southeast of Helena, Montana. Limited excavation and preparation thus far has led to the discovery of at least 37 families of insects and more than 40 taxa of plants (leaves, seeds, and stems). Preservation of the insect fossils is outstanding, with color patterns, feeding and reproductive structures commonly present. Quality of the preservation compares favorably with that of other Tertiary insect and plant Lagerstatten, such as Green River, Florissant, and Republic. The geologic affinities of the site are not certain, although the deposit has been regarded broadly as Oligocene, based on the mammalian biostratigraphy and an ash-flow tuff stratigraphically well below the insect horizon that has a U-Pb radiometric date of 32.0+ or -0.1 Ma.


ISSN: 1555-7332
EISSN: 1555-7340
Coden: WUGGAO
Serial Title: Rocky Mountain Geology
Serial Volume: 37
Serial Issue: 1
Title: A new insect and plant Lagerstaette from a Tertiary lake deposit along the Canyon Ferry Reservoir, southwestern Montana
Affiliation: ECB Consulting, Louisville, CO, United States
Pages: 13-30
Published: 2002
Text Language: English
Publisher: University of Wyoming, Dept. of Geology and Geophysics, Laramie, WY, United States
References: 58
Accession Number: 2004-040162
Categories: General paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, strat. cols.
N46°22'00" - N47°55'00", W113°10'00" - W111°34'60"
Secondary Affiliation: University of Wyoming, USA, United StatesMontana State University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200412
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