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Palynological interpretation of the type section, Chuckanut Formation, northwestern Washington

Peter H. Griggs
Palynological interpretation of the type section, Chuckanut Formation, northwestern Washington
Special Paper - Geological Society of America (1970) 127: 169-212

Abstract

A palynologic study of the lower part of the Samish Bay section of the Chuckanut Formation in northwestern Washington has been made to determine the age of these rocks and to interpret the nature of the source flora and environment of deposition. The Chuckanut Formation is a series of strongly folded, terrestrial sandstones and shales. On the basis of plant megafossils, this formation has previously been assigned an age of Late Cretaceous to early Eocene. Only the lower 5100 feet of the approximately 9500-foot section of the Chuckanut Formation along Samish Bay are adequately represented by the 22 samples reported on in this study. Seventy-nine palynomorphs are illustrated here. Of these, 19 have been used to zone the lower 5100 feet of strata into three parts. This zonation is based on changes in relative frequency and the stratigraphic ranges of these palynomorphs. It is demonstrated that these changes were brought about by changing environmental conditions during the deposition of the sediments. An age of late Late Cretaceous to early Eocene is indicated for the lower 5100 feet of the Chuckanut section exposed along Samish Bay, on the basis of analysis of the palynomorphs.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 127
Title: Palynological interpretation of the type section, Chuckanut Formation, northwestern Washington
Author(s): Griggs, Peter H.
Pages: 169-212
Published: 1970
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
Accession Number: 1971-026346
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. (incl. geol. sketch map)
N45°30'00" - N49°00'00", W124°45'00" - W116°55'00"
Source Note: No. 127
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1971
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