Quaternary dating methods walker

Fire and vegetation history on Santa Rosa Island, Channel Islands, and long-term environmental change in southern California.

Sabretoothed Carnivores and the Killing of Large Prey.

Near Helena area gravel bars and benches along the Trinity River contain placer gold.

González is interested in stable isotope chemistry and its application to continental paleoclimatology, carbonate geochemistry with emphasis on isotopic and trace elemental chemistry, carbonate geology with emphasis on karst development and carbonate deposition in marine and karst systems, and carbonate diagenetic processes. Hill's research focus is hydrogeology; computer simulation of natural systems; inverse modeling, uncertainty, and risk associated with environmental systems; and how science and public policy inform one another.

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Over the years, the development of new dating methods and the refinement of previous methods have stimulated revisions to geologic time scales. Research: Sedimentology, carbonate facies, and diagenesis, specifically Cretaceous carbonates in Mexico and Permo-Triassic carbonates in China. Research: Theoretical description of flow systems; characterization of aquifer heterogeneity by field, laboratory, and modeling activities; Model studies of groundwater availability in Kansas. Trilobite biostratigraphy, and Middle Cambrian faunas of North America, Greenland, and China. Evolution of the Brachiopoda and Neoproterozoic to Cambrian development of the plate margin of Greater Antarctica. Research: Invertebrate paleontology and biostratigraphy with emphasis on early Paleozoic. Research: Invertebrate paleontology with emphasis on Lower Paleozoic faunas and stratigraphy. Research: Geochemistry and regional geology with emphasis on geochronology of Early Proterozoic orogenic belts.Importance of microbiology in pharmacy; Structure of bacterial cell; Classification of microbes and their taxonomy: Actinomycetes, bacteria, rickettsiae, spirochetes and viruses; Identification of Microbes: Stains and types of staining techniques, electron microscopy; Nutrition, cultivation, isolation of bacteria, actinomycetes, fungi, viruses, etc; Microbial genetics and variation; Control of microbes by physical and chemical methods: Disinfection, factors influencing disinfectants, dynamics of disinfection, disinfectants and antiseptics and their evaluation; Sterilization: different methods, validation of sterilization methods & equipments; Sterility testing of all pharmaceutical products.Microbial assays of antibiotics, vitamins & amino acids.