Late Cretaceous pollen stratigraphy in the San Juan Basin, New Mexico (in collaboration with the Denver Museum of Nature and Science).
Environmental history, climate change and human development in northwest Ireland during the Neolithic (4000-2500 BC), using palynomorph analysis, geochemistry and radiocarbon dating.
Modern pollen and vegetation relationships in the Canadian Arctic as a basis for paleo interpretations (PI Emeritus Prof. Dr. H. Nichols, University of Colorado-Boulder).
Biostratigraphy on Eocene sedimentary deposits of intramontane basins, Wyoming.
Stable isotope analysis of lake sediments (15N, 13C).