New Permian ammonoid localities at Sibley's Last Chance Ranch, Delaware Mountains, Culberson County, Texas

dc.contributor.advisorLambert, Lance
dc.contributor.authorAllen, Matthew L.
dc.contributor.committeeMemberGodet, Alexis
dc.contributor.committeeMemberSuarez, Marina
dc.date.accessioned2024-01-26T20:58:40Z
dc.date.available2018-05-06
dc.date.available2024-01-26T20:58:40Z
dc.date.issued2016
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.abstractFour previously undocumented ammonoid localities at Sibley Ranch in the Delaware Mountains of Culberson County, Texas, are introduced in this study. Two previously known localities at the ranch are herein described in greater detail than in previous studies. A combined 280 specimens were studied in detail from all but one locality. The locus typicus of Newellites richardsoni is confirmed. Several new quantitative methods are introduced for sutural analysis of Cyclolobidae. These methods show potential for a more specific taxonomy of Cyclolobidae at the species level. Morphometric methods proposed by Korn (2010) for Mississippian ammonoids are applied to Middle Permian forms for the first time, and statistical analyses were conducted to distinguish taxa. Results suggest that these methods will allow for a significant improvement of accuracy in the taxonomy of Permian ammonoids. The Sibley Ranch ammonoid fauna is characteristic of the Wordian and Capitanian stages (Guadalupian Series). The assemblage includes representatives of Mexicoceras guadalupense, Altudoceras altudense, Newellites richardsoni, Paraceltites elegans, Roadoceras beedei, Timorites schucherti, Timorites uddeni, Roadoceras roadense, Cibolites uddeni, and Eumedlicottia burckhardti, as well as congeners of some of these taxa which were unable to be classified to the species level.
dc.description.departmentGeosciences
dc.format.extent114 pages
dc.format.mimetypeapplication/pdf
dc.identifier.isbn9781339718361
dc.identifier.urihttps://hdl.handle.net/20.500.12588/2581
dc.languageen
dc.subjectAmmonoid
dc.subjectDelaware Basin
dc.subjectDelaware Mountains
dc.subjectGuadalupe Mountains
dc.subjectGuadalupian
dc.subjectPermian
dc.subject.classificationPaleontology
dc.subject.classificationGeology
dc.subject.classificationSedimentary geology
dc.titleNew Permian ammonoid localities at Sibley's Last Chance Ranch, Delaware Mountains, Culberson County, Texas
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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