Dissertation/Thesis Abstract

Exceptionally well-preserved quaternary fossils from Sawmill Sink blue hole, Abaco, the Bahamas
by Albury, Nancy Ann, M.S., Mississippi State University, 2010, 197; 1475061
Abstract (Summary)

A diverse assemblage of exquisitely-preserved fossil animals and plants were collected from Sawmill Sink blue hole in Abaco, Bahamas. More than 40 species have been identified including extinct tortoise, an extant crocodile, and birds that no longer live in The Bahamas. This study addresses the mechanisms that preserve fossils in blue holes and discusses paleoecological implications from faunal diversity and sediment composition. Blue holes are water-filled caves with surface openings that may trap animals and surface-driven vegetation. In Sawmill Sink the talus cone within the halocline acts as a substrate on which organics collect that drive microbe ecology. Their byproducts, hydrogen sulfide and anoxia, inhibit biological destruction and delay necrolysis. Low tidal flow and quiescent water conditions further enhance stability of the depositional environment. In addition, subaerial conditions during glacial lowstands allowed owls to roost; their deposits formed a rich assemblage of small fossil vertebrates.

Keywords: blue hole, Abaco, Bahamas, fossil vertebrates, tortoise, crocodile

Indexing (document details)
Advisor: Mylroie, John E.
Commitee: Dewey, Chris P., Rodgers, John C.
School: Mississippi State University
Department: Geosciences
School Location: United States -- Mississippi
Source: MAI 48/05M, Masters Abstracts International
Subjects: Geology, Paleontology
Keywords: Abaco, Blue hole, Crocodile, Fossil vertebrates, Tortoise
Publication Number: 1475061
ISBN: 978-1-109-71835-5
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