Middle Ordovician Whiterockian Chazyan Trilobites From The Sunblood Formation District Of Mackenzie
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Author | : James V. Tremblay |
Publisher | : |
Total Pages | : |
Release | : 1989 |
Genre | : |
ISBN | : |
The 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.
Author | : Rolf Ludvigsen |
Publisher | : Ottawa, Canada : Energy, Mines and Resources Canada |
Total Pages | : 112 |
Release | : 1979 |
Genre | : Geology |
ISBN | : |
Author | : B. D. E.. Chatterton |
Publisher | : |
Total Pages | : 106 |
Release | : 1976 |
Genre | : Paleontology |
ISBN | : |
Author | : Rolf Ludvigsen |
Publisher | : 1975. |
Total Pages | : 1048 |
Release | : 1975 |
Genre | : Paleontology |
ISBN | : |
Author | : Harry Blackmore Whittington |
Publisher | : Geological Society of America |
Total Pages | : 183 |
Release | : 1953 |
Genre | : Paleontology |
ISBN | : 0813710596 |
Author | : Brian D. E. Chatterton |
Publisher | : |
Total Pages | : 74 |
Release | : 1980 |
Genre | : |
ISBN | : |
Author | : Manitoba. Mineral Resources Division |
Publisher | : Mineral Resources Division |
Total Pages | : 64 |
Release | : 1983 |
Genre | : Paleontology |
ISBN | : |
Author | : Murray John Copeland |
Publisher | : |
Total Pages | : 52 |
Release | : 1982 |
Genre | : Science |
ISBN | : |
"This detailed study of silicified Ostracoda from part of the Esbataottine Formation provides a basis for correlation of circum-cratonal early Middle Ordovician rocks of North America and consideration of their conditions of deposition." --
Author | : Byron Nelson Cooper |
Publisher | : Geological Society of America |
Total Pages | : 98 |
Release | : 1953 |
Genre | : Paleontology |
ISBN | : 0813710553 |
Forty-five species of lower Middle Ordovician trilobites, including six new genera and thirty new species, are described and illustrated from the extensive collections in the United States National Museum. Most of these species occur in beds whose age and correlation have been a matter of controversy for more than a decade. The stratigraphic evidence afforded by the trilobites lends strong support to regional stratigraphic interpretations of the lower Champlainian beds in the Appalachian Valley, which have been worked out by G. Arthur Cooper and the writer fromdetailed study of brachiopod faunas and from physical stratigraphic studies. The trilobites, like brachiopods, are not so restricted in their facies distribution as are many groups of invertebrate fossils. Hence they are very useful in establishing contemporaneity of dissimilar facies. In this paper only the more common trilobites are described. The principal purpose of this study is to make available for biostratigraphic use a number of trilobite species, most of which have been confused or misidentified previously.
Author | : Geological Survey of Canada |
Publisher | : |
Total Pages | : 336 |
Release | : 1950 |
Genre | : Geology |
ISBN | : |