Kneller, Margaret

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After studying geology as an undergraduate, Professor Margaret Kneller earned an M.E.S. in Environmental Sciences and a Ph.D. in Earth Sciences. Her interests are in ecosystems and paleoecology, with an emphasis on climate and plants. At JCU, Professor Kneller teaches and communicates the fundamentals of natural sciences, to non-science majors—since awareness of natural resources is important for navigating the urban and global environment.

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    Late-Quaternary climate in the Ridge and Valley of Virginia, U.S.A.: Changes in vegetation and depositional environment: A contribution to the ‘North Atlantic seaboard programme’ of IGCP-253, ‘Termination of the Pleistocene’
    (1993) Kneller, Margaret; Peteet, Dorothy
    Browns Pond, Virginia, in the Ridge and Valley physiographic province, contains a record of changing vegetational and depositional environments that dates to 17,130 BP. Six cores were retrieved in a transect of the pond. Pollen and macrofossils were identified from the longest central core and a series of AMS radiocarbon dates obtained from identified macrofossils and sediment. The pollen and macrofossil record combined with laterally consistent changes in lithostratigraphy reveal a changing climate. From 17,300 to 14,1(30 BP, a closed boreal forest of Pinus-Picea-Abies grew at the site. Pinus dominates the pollen assemblage while Picea and Abies dominate the macrofossil assemblage. Subtle increases in more thermophilous and mesophytic taxa indicate gradual climate amelioration after the fullglacial. A marked increase in A/nus at 14,100 BP signals an increase in moisture, possibly related to the global evidence for rapid climate change at 14,000 BP. At this central Appalachian site, Abies and Alnus are found in relatively greater amounts in the late-glacial forest than previous studies indicated. Low organic contents and evidence of gleyed conditions, seen in the core transect from 10,000 to 8000 BP, point towards low-water levels in the early Hoiocene----approximately coincident with the expansion of Quercus.