Title page for ETD etd-11162010-175412

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
  • Louisiana
  • Holocene
  • Mississippi River
  • Delta
  • Palynology
Date of Defense 2010-11-05
Availability unrestricted
Forty 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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