Ordovician Reef Paleoecology

My second research area involves the paleoecological analysis of Ordovician reef communities. I worked with one very accomplished undergraduate student, Josie Chiarello, where we assessed an extraordinary stromatoporoid-echinoderm buildup (reef) in east-central Missouri.

Josie Chiarello ’19 collecting samples from the Kimmswick reef.

This exposure is incredibly unique and unlike any buildup that has been noted in the Ordovician or even in the Paleozoic. The buildup hosts a paleocommunity of encrusting stromatoporoids, cyathocystid edrioasteroids, camerate and cladid crinoids, paracrinoids, edrioblastoids, bryozoans, tabulate and rugose corals, including many taxa that are rare elsewhere. The large buildup displays a vertical succession of encrusting echinoderms intergrown with stromatoporoids and other undetermined binding organisms. This occurrence of a reef-like community provides a unique opportunity to investigate questions of paleoenvironments and ecological interactions during the Late Ordovician and the Great Ordovician Biodiversity Event.

Josie looking at stromatoporoid ‘Christmas tree’ growths in the Kimmswick reef.

From my multiple field seasons on this outcrop and working with Ms. Chiarello during her honors thesis, the research has expanded into a multi-publication and multi-year project. Ms. Chiarello is now a doctoral student at the University of Cincinnati and this research project has developed into a collaborative project with Ms. Chiarello and her current PhD advisor, Dr. Carl Brett. Due to the incredibly unique nature of this rare reef community, we are planning to trace the reef community using high-resolution stratigraphy and correlations across the Midwest. I am currently finishing our first manuscript from this project, where Ms. Chiarello will be the second author. Ms. Chiarello is also working simultaneously on the second manuscript on this project based on her honors thesis.