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Benthic Paleoecology and Macroevolution
During the Norian Stage of the Late Triassic
by
Lydia S. Tackett
April 2014
Object Description
| Title | Benthic paleoecology and macroevolution during the Norian Stage of the Late Triassic |
| Author | Tackett, Lydia S. |
| Author email | tackett@usc.edu;Lydia.Tackett@gmail.com |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Geological Sciences |
| School | College of Letters, Arts and Sciences |
| Date defended/completed | 2014-04-30 |
| Date submitted | 2014-04-30 |
| Date approved | 2014-04-30 |
| Restricted until | 2014-04-30 |
| Date published | 2014-04-30 |
| Advisor (committee chair) | Bottjer, David J. |
| Advisor (committee member) |
Corsetti, Frank A. Caron, David A. |
| Abstract | Shallow marine benthic animals underwent major paleoecological changes during the Norian Stage of the Late Triassic. This research identified these biological transitions by collecting several thousand macroinvertebrate fossils from sedimentary sequences representing two major oceanic realms in the Triassic: the Tethys Sea and Panthalassa. The faunal turnovers were correlated with a combination of chronostratigraphic methods, including strontium isotope chemostratigraphy. Among shelly invertebrates, stationary surface-dwellers that were ecologically dominant in the Early Norian were replaced in multiple phases by animals that were facultatively mobile, or capable of burrowing into the sediment, or cemented to the seafloor. These transitions coincided with taxonomic radiations of predators that were specialized for durophagy in shallow marine environments. The synchronous appearance of morphological features and behaviors related to benthic durophagy among multiple clades of predators and prey suggest the Norian Stage was a non‐static interval in which evolutionary and geological forcers operated at a global scale to reorganize shallow marine ecosystems. |
| Keyword | Norian; Mesozoic; paleoecology; macroevolution; predation; predator‐prey interactions; Manicouagan; evolution; invertebrates; paleontology; strontium; chemostratigraphy; Panthalassa; Tethys; escalation; Mesozoic marine revolution; Triassic; mass extinction |
| Language | English |
| Format (imt) | application/pdf |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Provenance | Electronically uploaded by the author |
| Type | texts |
| Legacy record ID | usctheses-m |
| Contributing entity | University of Southern California |
| Rights | Tackett, Lydia S. |
| Access conditions | The author retains rights to his/her dissertation, thesis or other graduate work according to U.S. copyright law. Electronic access is being provided by the USC Libraries in agreement with the author, as the original true and official version of the work, but does not grant the reader permission to use the work if the desired use is covered by copyright. It is the author, as rights holder, who must provide use permission if such use is covered by copyright. The original signature page accompanying the original submission of the work to the USC Libraries is retained by the USC Libraries and a copy of it may be obtained by authorized requesters contacting the repository e-mail address given. |
| Repository name | University of Southern California Digital Library |
| Repository address | USC Digital Library, University of Southern California, University Park Campus MC 7002, 106 University Village, Los Angeles, California 90089-7002, USA |
| Repository email | cisadmin@usc.edu |
| Filename | etd-TackettLyd-2479.pdf |
| Archival file | uscthesesreloadpub_Volume8/etd-TackettLyd-2479.pdf |
