The plant microfossil analysis recovered fragments of conifer tracheid and vessel elements with a ray of parenchyma cells, which corroborates the consumption of wood plants, pollen grains, spores, and fibers.
He was co-investigator with David McKay (PI) of the NASA Johnson Space Center on the study of biomarkers and microfossils in meteorites, astromaterials and ancient terrestrial rocks, and collaborated with Kenneth Nealson (PI) from NASA Jet Propulsion Laboratory on the investigation of microbial extremophiles from some of the Earth's most hostile environments as related to the co-evolution of planets and biospheres.