A New Family of Arcestaceae from East Timor, Indonesia

dc.contributor.advisorLambert, Lance L.
dc.contributor.authorAllen, Jena J.
dc.contributor.committeeMemberSuarez, Marina
dc.contributor.committeeMemberVote, Janet
dc.creator.orcidhttps://orcid.org/0000-0001-6145-2025
dc.date.accessioned2024-01-26T20:58:40Z
dc.date.available2020-05-15
dc.date.available2024-01-26T20:58:40Z
dc.date.issued2018
dc.descriptionThis item is available only to currently enrolled UTSA students, faculty or staff. To download, navigate to Log In in the top right-hand corner of this screen, then select Log in with my UTSA ID.
dc.description.abstractA collection of 15 Ammonoidea specimens were recovered from eastern Timor, Indonesia. The strata for which the specimens collected were dated as the mid-Triassic, and the samples were originally classified as Joannites of the Triassic. However, upon further examination it became apparent that the specimens more closely resembled Cyclolobidea of the Permian. The Cyclolobidea were thought to have gone extinct well before the Permian Mass Extinction event, so for these specimens to be discovered in Triassic-aged rock has some interesting implications. The specimens in question are described and categorized, with sutures being drawn for each specimen where possible. Once fully analyzed, the data is compared to various hypotheses to derive the most likely explanation for these unusual specimens. The original hypothesis was that Timor acted as a refugia during the Permian-Triassic boundary, creating a safe-haven where Cyclolobidea and their resulting descendants could continue to live into the Mesozoic. However, further research has led to more likely possibilities: they could be a new taxon entirely, unrelated to Cyclolobidea; or perhaps a currently undescribed taxon that demonstrates homologous structures to cyclolobids.
dc.description.departmentGeosciences
dc.format.extent67 pages
dc.format.mimetypeapplication/pdf
dc.identifier.urihttps://hdl.handle.net/20.500.12588/2582
dc.languageen
dc.subjectAllen
dc.subjectAmmonoids
dc.subjectArcestaceae
dc.subjectIndonesia
dc.subjectNew Family
dc.subjectTimor
dc.subject.classificationPaleontology
dc.subject.classificationGeology
dc.titleA New Family of Arcestaceae from East Timor, Indonesia
dc.typeThesis
dc.type.dcmiText
dcterms.accessRightspq_closed
thesis.degree.departmentGeosciences
thesis.degree.grantorUniversity of Texas at San Antonio
thesis.degree.levelMasters
thesis.degree.nameMaster of Science

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