The cycling and distribution of "life elements" (C, O, N, S, P) and compounds in modern and ancient marine and terrestrial settings. Emphasis on the transfer of compounds from the biota to their surroundings. Topics include: anthropogenic influence on biogeochemical cycles, imporance of microbes in geochemistry, utility of bio-markers in reconstructing paleoecosy-stems and paleoenvironments. Prerequisite: one year of college chemistry, or Geo-Sci 415 or consent or instructor. Organic Chemistry highly recommended.