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  • http://hdl.handle.net/10402/era.27559
  • Sedimentological and ichnological characteristics of modern and ancient channel-fills, Willapa Bay, Washington
  • Schoengut, Jesse
  • English
  • sedimentology
    ichnology
    Willapa Bay
    channel-fill
    eta cross-stratification
    inclined heterolithic stratification
  • Sep 30, 2011 5:52 PM
  • Thesis
  • English
  • Adobe PDF
  • 379930173 bytes
  • Estuarine-associated facies make up a significant component of ancient geological systems, and are exceedingly economically important today for their ability to trap hydrocarbons. While many aspects of estuaries are understood today, little is documented regarding the sedimentological and ichnological character of middle and inner estuary channel-fill deposits. These deposits are associated with deposition in entrenched, almost fully marine tidal channels, and are deposited across the width of the channel as a combination of inclined heterolithic and heterolithic strata. Willapa Bay provides an excellent locale to compare ancient channel-fill deposits present in Pliocene to Pleistocene-aged terrace deposits to modern examples from tidal channels. Sedimentological and ichnological criteria for these channel-fills will be discussed, as will vertical profiles, lateral trends, and the depositional affinity and character of these channel-fills. Because channel-fills vary in a transitional and predictable fashion, they act as excellent palaeogeographical indicators when discerning ancient estuarine environments.
  • Master's
  • Master of Science
  • Department of Earth and Atmospheric Sciences
  • Fall 2011
  • Gingras, Murray (Earth and Atmospheric Sciences)
  • Pemberton, S. George (Earth and Atmospheric Sciences)
    Zonneveld, John-Paul (Earth and Atmospheric Sciences)
    Acorn, John (Renewable Resources)