Loading...
Temporal Changes in Permian Marine Ostracode Faunas with Regression, Florena Shale, Northeastern Kansas
Costanzo, Gary Vincent
Costanzo, Gary Vincent
Citations
Altmetric:
Abstract
The Florena Shale (Permian, Wolfcampian) of the Midcontinent of North America was deposited in a restricted marine basin. Shifting environments due to marine regression caused a gradual change in the ostracode fauna.
Q-and R-mode cluster analysis and ordination by nonmetric multidimensional scaling of ostracode relative abundance data revealed three ostracode assemblages, each characteristic of a different environment. The Cryptobairdia seminalis assemblage from the lowest Florens is characteristic of deeper water, offshore, marine environments with only minor influx of terrigenous mud. The Amphissites centronotus assemblage, found above the C. seminalis assemblage, occupied a similar environment, but with greater influx of terrigenous mud and intervals of increased turbidity. The Knightina texana assemblage occurs stratigraphically highest and probably represents a quiet-water, very shallow, nearshore, marine environment. Although protected from strong wave and current activity, the overlying water mass was occasionally turbid.
Species diversity of ostracodes is high both at the base of the Florena, in the most offshore position, and at the top of the lower Florena, in a more nearshore position, but it follows no definite trend. In contrast to diversities of ostracodes from similar environments in other stratigraphic units, the K. texana assemblage has an anomalously high diversity. This is due in part to time averaging of adjacent ostracode assemblages and a strong taphonomic overprint.
Description
M.S. University of Kansas, Geology 1986
Date
1986-05-31
Journal Title
Journal ISSN
Volume Title
Publisher
University of Kansas
Collections
Archive Status
This item contains archived web content.
Files
Loading...
costanzo_1986_1034115.pdf
Adobe PDF, 1.84 MB