Middle Ordovician (Whiterockian-Chazyan) trilobites from the Sunblood Formation, District of Mackenzie
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, si...
Main Author: | |
---|---|
Other Authors: | |
Format: | Thesis |
Language: | English |
Published: |
Brock University
2009
|
Subjects: | |
Online Access: | http://hdl.handle.net/10464/1960 |
id |
ftbrockuniv:oai:dr.library.brocku.ca:10464/1960 |
---|---|
record_format |
openpolar |
spelling |
ftbrockuniv:oai:dr.library.brocku.ca:10464/1960 2024-06-09T07:48:40+00:00 Middle Ordovician (Whiterockian-Chazyan) trilobites from the Sunblood Formation, District of Mackenzie Tremblay, James V. Department of Earth Sciences 2009-07-09T18:39:05Z http://hdl.handle.net/10464/1960 eng eng Brock University http://hdl.handle.net/10464/1960 Trilobites--Northwest Territories--Mackenzie Geology Stratigraphic|yOrdovician Geology--Northwest Territories--Mackenzie Electronic Thesis or Dissertation 2009 ftbrockuniv 2024-05-16T06:42:42Z 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. Thesis Northwest Territories South Nahanni River Brock University Digital Repository Northwest Territories South Nahanni River ENVELOPE(-123.353,-123.353,61.050,61.050) |
institution |
Open Polar |
collection |
Brock University Digital Repository |
op_collection_id |
ftbrockuniv |
language |
English |
topic |
Trilobites--Northwest Territories--Mackenzie Geology Stratigraphic|yOrdovician Geology--Northwest Territories--Mackenzie |
spellingShingle |
Trilobites--Northwest Territories--Mackenzie Geology Stratigraphic|yOrdovician Geology--Northwest Territories--Mackenzie Tremblay, James V. Middle Ordovician (Whiterockian-Chazyan) trilobites from the Sunblood Formation, District of Mackenzie |
topic_facet |
Trilobites--Northwest Territories--Mackenzie Geology Stratigraphic|yOrdovician Geology--Northwest Territories--Mackenzie |
description |
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. |
author2 |
Department of Earth Sciences |
format |
Thesis |
author |
Tremblay, James V. |
author_facet |
Tremblay, James V. |
author_sort |
Tremblay, James V. |
title |
Middle Ordovician (Whiterockian-Chazyan) trilobites from the Sunblood Formation, District of Mackenzie |
title_short |
Middle Ordovician (Whiterockian-Chazyan) trilobites from the Sunblood Formation, District of Mackenzie |
title_full |
Middle Ordovician (Whiterockian-Chazyan) trilobites from the Sunblood Formation, District of Mackenzie |
title_fullStr |
Middle Ordovician (Whiterockian-Chazyan) trilobites from the Sunblood Formation, District of Mackenzie |
title_full_unstemmed |
Middle Ordovician (Whiterockian-Chazyan) trilobites from the Sunblood Formation, District of Mackenzie |
title_sort |
middle ordovician (whiterockian-chazyan) trilobites from the sunblood formation, district of mackenzie |
publisher |
Brock University |
publishDate |
2009 |
url |
http://hdl.handle.net/10464/1960 |
long_lat |
ENVELOPE(-123.353,-123.353,61.050,61.050) |
geographic |
Northwest Territories South Nahanni River |
geographic_facet |
Northwest Territories South Nahanni River |
genre |
Northwest Territories South Nahanni River |
genre_facet |
Northwest Territories South Nahanni River |
op_relation |
http://hdl.handle.net/10464/1960 |
_version_ |
1801380475453833216 |