Type of Document Master's Thesis Author Crouch, Russell Ryan Author's Email Address Russellcrouch1@yahoo.com URN etd-11162010-175412 Title Palynological Analysis of Tiger and Trinity Shoals, Louisiana Continental Shelf Degree Master of Science (M.S.) Department Geology & Geophysics Advisory Committee
Advisor Name Title Warny, Sophie Committee Chair Bart, Philip Committee Member Roberts, Harry Committee Member Keywords
- Mississippi River
Date of Defense 2010-11-05 Availability unrestricted AbstractForty sediment samples taken from twenty-six vibracores collected from
Holocene shoals (Tiger and Trinity) were processed for palynomorphs and analyzed to
characterize the terrestrial and marine paleo-environments of southern Louisiana at the
time of deposition of each shoal. Abundant and diverse pollen assemblages were
recovered while marine microplankton were sparse (< 2% relative abundance). Pollen
species were grouped by plants of similar environmental significances including arboreal,
non-arboreal, aquatic, and shrub categories. Palynological signals were compared in
detail between each core, as well as along strike and dip transects, to help determine
whether or not these shoals were deposited coevally or in distinct depositional cycles.
Evidence shows that Tiger and Trinity Shoals carry remarkably similar
palynological profiles, indicating that sediments of these shoals areS from the same
source, and that deposition extended over an interval of time such that climate change
was not sufficient enough to alter the vegetation response (hence palynological signal).
Pollen profiles show source sediments are predominantly from the lower Mississippi
River drainage basin and exhibit species similar to those present in modern Louisiana
coastal marshes and swamps (i.e., Taxodium distichum, Cyperaceae, Graminae,
Chenopodiaceae, and Asteraceae), and coastal to upland hardwood forests of the
Mississippi River alluvial valley (i.e., Pinus, Quercus, Carya, and Liquidambar
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