2014 GSA Annual Meeting in Vancouver, British Columbia (19–22 October 2014)

Paper No. 167-1
Presentation Time: 1:05 PM

CONODONT BIOSTRATIGRAPHY OF THE SWEETLAND CREEK SHALE AND GRASSY CREEK SHALE, UPPER DEVONIAN, SOUTHEASTERN IOWA BASIN


HYNES, Alyssa Rose, Department of Geological Sciences, SUNY Geneseo, 1 College Circle, Geneseo, NY 14454, OVER, D. Jeffrey, Geological Sciences, SUNY-Geneseo, Geneseo, NY 14454-1401 and DAY II, James E., Geography& Geology, Illinois State University, Campus Box 4400, Normal, IL 61790-4400

Conodonts were collected for biostratigraphic analysis from core samples of the Upper Devonian Sweetland Creek and Grassy Creek formations from the southeastern Iowa Basin. The presence of Palmatolepis winchelli, Palmatolepis bogartensis, Ancyrodella buckeyensis, and Polygnathus decorosus indicate that the conodont zonation of the Sweetland Creek is MN-13. The Frasnian-Famennian boundary was determined to be within the Grassy Creek Shale at interval 615.25 – 615.5, as determined by the first occurrence of Palmatolepis triangularis. The Lower triangularis conodont Zone follows directly after this boundary, until the appearance of Palmatolepis delicatula and Palmatolepis subperlobata at interval 614.3-614.75 signify the start of the Middle triangularis Zone.

Session No. 167

T206. Mass Extinctions: Volcanism, Impacts, and Catastrophic Environmental Change I
Monday, 20 October 2014: 1:00 PM-5:00 PM
223/224 (Vancouver Convention Centre-West)
Geological Society of America Abstracts with Programs. Vol. 46, No. 6, p.420
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