We address fundamentally geobiologic questions via the sedimentary record.  Many of our projects investigate the co-evolution of the Earth and its biosphere.

 A small sample of current projects and field localities:

• Stromatolites: what do they really mean?

• Big bacteria, small eukarotes in the fossil record--Does size matter?

• Geobiology of the end-Permian and end-Triassic extinctions

• The evolution of continental freeboard through time, links to biotic evolution and global biogeochemical cycles

• Precambrian-Cambrian Transition

• Terminal Proterozoic ocean chemistry and geobiology

• Cambrian Substrate Revolution

• Life during Snowball Earth

• Microbial-Sediment Interaction

• Archean and Proterozoic biogeology

• Carbonates!

• Coated Grains

• Trends in ooids and diagenesis through time

• Mixed siliciclastic-carbonate environments and their development