Quantitative Trilobite Biostratigraphy of the Middle Cambrian (Wuliuan Stage; Miaolingian Series) and Microfacies Analysis of the Middle Cambrian Stephen Formation, Southern Canadian Rocky Mountains

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dc.contributor.advisorHenderson, Charles Murray
dc.contributor.authorMorgan, Chad Alexander
dc.contributor.committeememberBeauchamp, Benoit
dc.contributor.committeememberHubbard, Stephen
dc.contributor.committeememberDewing, Keith
dc.contributor.committeememberWebster, Mark
dc.date2021-11
dc.date.accessioned2021-07-19T15:41:55Z
dc.date.available2021-07-19T15:41:55Z
dc.date.issued2021-07-06
dc.description.abstractCarbonate microfacies and trilobite successions were examined in seven sections of the Stephen Formation, southern Canadian Rocky Mountains. Seven microfacies and three ichnofacies are identified, including a new Protopaleodictyon ichnofacies with Protopaleodictyon aitkeni (n. isp.). Palaeoenvironments include ephemeral oolitic shoals, intraclastic/oncoidal tempestites, and quiescent muddy-bottomed mid-shelf within a low-latitude, carbonate platform. Three parasequences were identified in the Narao Member, and five in the Waputik Member. Narao Member parasequences are sub-tidal muddy carbonate, shallowing toward microbial build-ups. Waputik Member parasequences contain green-grey, laminated shale, with sporadic carbonate tempestites, indicating a platform inundated by upwelling cool-dysoxic water. Carbonate production was shut-off, except within localized shoals and build-ups. The stacking pattern indicates slow base-level change with periodic upwelling events. The overlying Eldon Formation re-established carbonate platform deposition associated with a stabilised chemocline. Chemocline perturbation is postulated to affect trilobite biomere extinction at the Narao-Waputik boundary. Fifteen trilobite species, eleven trilobite genera, one orthothecid, one edrioasteroid, and three Burgess Shale organisms (Tuzoia, Haplophrentis carinatus, Margaretia dorus) were identified in the Stephen Formation, which ranges from the uppermost Glossopleura Assemblage Biozone into the Ehmaniella Assemblage Biozone. Four new biozones are established in this interval, including the Glossopleura boccar, Proehmaniella basilica, Ehmaniella waptaensis, and Spencella montanensis interval biozones. A quantitative biostratigraphy using Unitary Association (UA), integrates regional biozones from southwestern USA and western Canada into a unified Miaolingian trilobite succession (582 taxa, 1035 samples, 121 sections, and 48 formations). Seventy-three UA biozones, including 33 previously defined biozones, are delineated from the upper Bonnia-Olenellus to Cedaria assemblage zones. Six new Wuliuan interval biozones (Fieldaspis superba, Albertella bosworthi, Glossopleura boccar, Proehmaniella basilica, Spencella montanensis, and Bathyuriscus adaeus) are established. Nineteen UA zones encompass the top of the upper Bonnia-Olenellus Assemblage Biozone, 11 in the Plagiura-Poliella Assemblage Biozone, 18 in the Albertella Assemblage Biozone, 10 within the Glossopleura Assemblage Biozone, 7 within the Ehmaniella Assemblage Biozone, and 8 in the Bolaspidella and Cedaria biozones. This is the first recognition of temporal equivalence of regional biozones using quantitative biostratigraphic methods. The faunal succession informs biostratigraphic correlation potential pointing to mid-Cambrian intervals that may yield additional high-resolution biozones in the future.en_US
dc.identifier.citationMorgan, C. A. (2021). Quantitative Trilobite Biostratigraphy of the Middle Cambrian (Wuliuan Stage; Miaolingian Series) and Microfacies Analysis of the Middle Cambrian Stephen Formation, Southern Canadian Rocky Mountains (Doctoral thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca.en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/39018
dc.identifier.urihttp://hdl.handle.net/1880/113644
dc.language.isoengen_US
dc.publisher.facultyScienceen_US
dc.publisher.institutionUniversity of Calgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.en_US
dc.subjectBiostratigraphic methodsen_US
dc.subjectquantitative biostratigraphyen_US
dc.subjectmid-Cambrianen_US
dc.subjectbiomereen_US
dc.subjectmicrofacies analysisen_US
dc.subjectsequence stratigraphyen_US
dc.subjectglobal correlationen_US
dc.subjectBurgess Shaleen_US
dc.subject.classificationGeologyen_US
dc.subject.classificationPaleontologyen_US
dc.titleQuantitative Trilobite Biostratigraphy of the Middle Cambrian (Wuliuan Stage; Miaolingian Series) and Microfacies Analysis of the Middle Cambrian Stephen Formation, Southern Canadian Rocky Mountainsen_US
dc.typedoctoral thesisen_US
thesis.degree.disciplineGeoscienceen_US
thesis.degree.grantorUniversity of Calgaryen_US
thesis.degree.nameDoctor of Philosophy (PhD)en_US
ucalgary.item.requestcopytrueen_US
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