Also known as A 125
Where: Northwest Territories, Canada (61.6° N, 125.7° W: paleocoordinates 5.5° N, 59.9° W)
• coordinate estimated from map
• outcrop-level geographic resolution
When: Esbataottine Formation, Chazyan (470.0 - 457.3 Ma)
• bed-level stratigraphic resolution
Environment/lithology: deep subtidal; argillaceous, silty limestone
Size classes: macrofossils, microfossils
Preservation: replaced with silica
Reposited in the GSC
Primary reference: B. D. E. Chatterton and R. Ludvigsen. 1976. Silicified Middle Ordovician trilobites from the South Nahanni River Area, District of Mackenzie, Canada. Palaeontographica Abteilung A 154(1-3):1-106 [S. Holland/T. Hanson/T. Hanson]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 25933: authorized by Steven Holland, entered by Tori Hanson on 28.09.2002, edited by Melanie Hopkins and Pete Wagner
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Rhynchonellata | |
Mimella sp. Cooper 1930 | |
Chaulistomella sp. Cooper 1956 | |
Glyptorthis sp. Foerste 1914 | |
Rostricellula sp. Ulrich and Cooper 1942 | |
Strophomenata | |
"? Macrocoelia sp." = Colaptomena
"? Macrocoelia sp." = Colaptomena Cooper 1956 | |
Ostracoda | |
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Bolbopisthia ludvigseni n. sp.3
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Steusloffina borealis n. sp.3
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Eurychilina sunbloodensis n. sp.3
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Tetradella perplexa n. sp.3
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? Euprimitia krafti n. sp.3
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Trilobita | |
Ceratocephala triacantheis Whittington and Evitt 1953 trilobite
Apianurus parabarbatus Chatterton and Ludvigsen 1976 trilobite | |
Isotelus parvirugosus Chatterton and Ludvigsen 1976 trilobite | |
Remopleurides pattersoni Chatterton and Ludvigsen 1976 trilobite | |
Hemiarges turneri Chatterton and Ludvigsen 1976 trilobite
Amphilichas aff. aspratilis Bradley 1930 trilobite | |
Failleana calva Chatterton and Ludvigsen 1976 trilobite | |
Nanillaenus aduncus Chatterton and Ludvigsen 1976 trilobite
Nanillaenus mackenziensis Chatterton and Ludvigsen 1976 trilobite
"Bumastus (Bumastoides) lenzi" = Bumastoides lenzi Chatterton and Ludvigsen 1976 trilobite | |
Calyptaulax callirachis Cooper 1953 trilobite | |
Cybeloides cimelia Chatterton and Ludvigsen 1976 trilobite | |
Sphaerocoryphe ludvigseni2, Sphaerexochus arenosus, Acanthoparypha echinoderma, Acanthoparypha evitti, Pandaspinapyga dactyla, Holia glabra1, Heliomeroides freschaufae2, Ceraurinella nahanniensis, Ceraurinella kingstoni
Sphaerexochus arenosus Chatterton and Ludvigsen 1976 trilobite
Acanthoparypha echinoderma Chatterton and Ludvigsen 1976 trilobite
Acanthoparypha evitti Chatterton and Ludvigsen 1976 trilobite
Pandaspinapyga dactyla Chatterton and Ludvigsen 1976 trilobite
Ceraurinella nahanniensis Chatterton and Ludvigsen 1976 trilobite
Ceraurinella kingstoni Chatterton and Ludvigsen 1976 trilobite | |
"Carrickia pinguimitra" = Phorocephala pinguimitra
"Carrickia pinguimitra" = Phorocephala pinguimitra Chatterton and Ludvigsen 1976 trilobite | |
Dolichoharpes aff. reticulata Whittington 1949 trilobite |