Seismic features on a seismic horizon at or near the Cretaceous-Paleogene boundary in northern Louisiana seen by Egedahl (2012), and then studied in greater depth by Strong (2013), resemble large subaqueous dunes or “mega-ripples.” Both Egedahl (2012) and Strong (2013) hypothesize that these features represent subaqueous dunes emplaced by tsunami waves caused by the Chicxulub Impact, the large bolide impact on the Yucatán Peninsula, that is widely agreed to be one of the contributing factors to the demise of the dinosaurs. Three hundred and eighteen well logs in northern Louisiana were analyzed to determine whether possible subaqueous dunes are evidenced at the Cretaceous-Paleogene boundary in this data set. These same well logs were used to develop a contour map of the top of Cretaceous and to determine the topography of the top of the Cretaceous in northern Louisiana at the time of the Chicxulub Impact. Further, the log facies of these logs were interpreted to deduce paleo-shoreline for this topography at the time of the Cretaceous-Paleogene boundary.
|Advisor:||Kinsland, Gary L.|
|Commitee:||Lock, Brian E., Richter, Carl|
|School:||University of Louisiana at Lafayette|
|School Location:||United States -- Louisiana|
|Source:||MAI 57/01M(E), Masters Abstracts International|
|Keywords:||Chicxulub, Paleo-shoreline, Subaqueous dunes|
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