1.1" Fossil Shrimp (Kallidecthes) Nodule (Pos/Neg) - Mazon Creek
The straightline measurement of the shrimp is 1.1" wide, however if extended, the shrimp would measure about 2.2" long.
Over 500 animal and 200 flora species have been described from Mazon Creek. The event that caused this die off and preservation is believed to have started with a catastrophic flood event that buried the biota of the modern day Mazon Creek area. The deposition of river-borne silt and clay, brought on by upland erosion and delta progradation, contributed to the incredible preservation of one of the most complete records of Paleozoic biota.
This site has been collected for more than 100 years, and likely will continue to be collected by both professionals and amateurs for many years to come.