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Found what I think looks like a trilobite cephalon in a creekbed, but I'm not certain. It was fragmented, and the shell looks to be eroded away. This creek had a slurry of Mississippian aged Burlington Formation and assumed Ordovician aged Trenton Limestone mixed throughout. I found Mississippian crinoids and Ordovician cephalopods at this location. It looks like it resembles Illaenus taurus, or some other member of the Illaenidae. Any opinions?

'Big Ugly Diamond' discovered by Arkansas state park visitor BBC News, March 16, 2023 Hausel, W.D., 2008. Diamond Deposits Of The North American Craton–An Overview. Topics in Wyoming Geology: Wyoming Geological Association Guidebook, 2008, Pages 103-138 Howard, J.M. and Hanson, W.D., 2008. Geology of the Crater of Diamonds State Park and Vicinity, Pike County, Arkansas. Arkansas Geological Survey. Dunn, D., 2003, June. Diamond evaluation of the Prairie Creek lamproite province, Arkansas, USA. In International Kimberlite Conference: Extended Abstracts (Vol. 8). Dunn, D.P., 2002. Xenolith mineralogy and geology of the Prairie Creek lamproite province, Arkansas. The University of Texas at Austin. Clift, P.D., Heinrich, P., Dunn, D., Jacobus, A. and Blusztajn, J., 2018. The Sabine block, Gulf of Mexico: promontory on the North American margin?. Geology, 46(1), pp.15-18. Howard, J.M., 1996. Finding Diamonds in Arkansas. Arkansas Geological Commission. Yours, Paul H.

A California woman discovered a 4.38 carat yellow diamond Publications: Dunn, D.P., 2002. Xenolith mineralogy and geology of the Prairie Creek lamproite province, Arkansas. The University of Texas at Austin. Dunn (2002) PDF Dunn, D., 2003, June. Diamond evaluation of the Prairie Creek lamproite province, Arkansas, USA. In International Kimberlite Conference: Extended Abstracts (Vol. 8). Online Publications of Dr. Dennis Dunn Howard, J. M., 1996, Find Diamonds in Arkansas. Arkansas Geological Survey, Little Rock, Arkansas Geologic Map of the Crater of Diamonds State Park and Vicinity, Pike County, Arkansas Previous posts about Crater of Diamonds State Park, Arkansas Yours, Paul H.