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dc.contributor.authorTremblay, James V.en_US
dc.date.accessioned2009-07-09T18:39:05Z
dc.date.available2009-07-09T18:39:05Z
dc.date.issued1989-07-09T18:39:05Z
dc.identifier.urihttp://hdl.handle.net/10464/1960
dc.description.abstractThe Middle Ordovician Sunblood Formation in the South Nahanni River area, District of Mackenzie, comprises mainly limestones and dolostones of intertidal and shallow subtidal origin as indicated by the presence of desiccation polygons, fenestral fabric, and oncolites. The study of well preserved, silicified trilobites from low diversity, Bathyurus-dominated, Nearshore Biofacies faunas of Whiterockian and Chazyan age collected in six stratigraphic sections through the Sunblood Formation permits the recognition of three new Whiterockian zones, and two previously established Chazyan zones. The Bathyurus mackenziensis, Bathyurus sunbloodensis, and Bathyurus margareti zones (Whiterockian), together with the Bathyurus nevadensis and Bathyurus granu/osus zones (Chazyan) represent the Nearshore Biofacies components of a dual biostratigraphic scheme that considers both temporal and spatial distribution patterns, and are compositionally distinct from faunas in correlative strata around North America that represent other biofacies. Twenty-six species belonging to eighteen genera are described and illustrated. Ludvigsenella ellipsepyga is established as a new bathyurine genus, in addition to four new species of Bathyurus : Bathyurus mackenziensis, Bathyurus sunbloodensis, Bathyurus margareti and Bathyurus acanthopyga. Other genera present are: Basilicus, Isote/us, ///aenus, Bumastoides, Fail/eana, Phorocepha/a,Ceraurinella, Acanthoparypha, Xystocrania, Cydonocephalus, Ectenonotus, Pseudomera, Encrinuroides, Calyptaulax, Amphilichas and Hemiarges.en_US
dc.language.isoengen_US
dc.publisherBrock Universityen_US
dc.subjectTrilobites--Northwest Territories--Mackenzie.en_US
dc.subjectGeology, Stratigraphic|yOrdovician.en_US
dc.subjectGeology--Northwest Territories--Mackenzie.en_US
dc.titleMiddle Ordovician (Whiterockian-Chazyan) trilobites from the Sunblood Formation, District of Mackenzieen_US
dc.typeElectronic Thesis or Dissertationen
dc.degree.nameM.Sc. Earth Sciencesen_US
dc.degree.levelMastersen_US
dc.contributor.departmentDepartment of Earth Sciencesen_US
dc.degree.disciplineFaculty of Mathematics and Scienceen_US
refterms.dateFOA2021-07-16T11:12:21Z


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