Carbonate Concretions as Taphonomic Gold Mines

Summons Lab & Collins Lab

While the role of thermal diagenetic alteration of organic matter is well understood, far fewer studies have focused on the diversity of early diagenetic processes which dictate organic matter preservation depending on environmental setting. In order to better understand the relationship between depositional and biological processes, we are analyzing a suite of Holocene-age fish concretions via lipid extraction, protein sequencing, and ancient DNA sequencing which have partially decomposed and contain a wide range of biomolecules from eukaryotes, bacteria and archaea.

We believe these fossils provide a unique opportunity to probe the diagenetic continuum or the "window" into the biological-biological and biological-geological transition and preservation of body fossils and a diversity of biomolecules

Below are various fossils that are currently being studied.

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