Carbonate factory evolution across the End-Triassic extinction

I am using the novel stable strontium isotope proxy to study changes in carbonate factory dynamics across the end-Triassic mass extinction using rocks from Alaska and Nevada.

Detrital zircon geochronology of the Harkless Fm

I am using detrital zircon U-Pb geochronology to better constrain the age of the Harkless Formation and its relationships with other Death Valley strata.

Facies analysis of the Cambrian SPICE event in Appalachia

I collected carbon isotope data which establish 3 new SPICE sections in Maryland and Virginia. I also looked at sedimentology and fossil abundance to compare trends within the basin.

Nitrogen & phosphorus in Pleistocene corals

I am using coral-skeleton nitrogen isotopes and carbonate-associated phosphate to understand glacial-interglacial changes in nutrient cycling in Hawaiian coral reefs.

Early Paleozoic carbon isotopes from western MD

I am leading the construction of a Cambrian-Ordovician carbon isotope curve using over 1100 carbon isotope measurements from 2km of strata.

Taphonomy of silicified cyanobacteria from the Harkless Formation

I described a new occurrence of silicified cyanobacterial fossils from the early Cambrian Harkless Formation and proposed a mechanism for their preservation.

Unusual iron cycling and clay mineralogy in Cambrian shales

Iron speciation analysis produced strange results for the green shales of the Cambrian Harkless Formation. I seek to understand how iron-rich clays affect the iron speciation paleoredox proxy.