Where: Northwest Territories, Canada (62.4° N, 127.0° W: paleocoordinates 6.2° N, 50.8° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Delorme Formation, Wenlock (433.4 - 427.4 Ma)
• Zonation based on conodonts present in AV sections 1, 2, and 4. (AV 3 and DR sections correlated with these on basis of trilobite faunal assemblages. I'm assuming AV5 can be correlated as well.) See PBDB ref. 7215. This fauna is between j (early Wenlock) and k (upper Wenlock/lower Ludlow).
• group of beds-level stratigraphic resolution
Environment/lithology: slope; argillaceous limestone and shale
•SEP environmental call based primarily on PBDB ref. 7215.
Preservation: replaced with silica
Primary reference: D. J. Siveter and B. D. E. Chatterton. 1996. Silicified calymenid trilobites from the Mackenzie Mountains, northwest Canada. Palaeontographica Abteilung A 239(1-3):43-60 [M. Foote/M. Foote/M. Foote]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 26059: authorized by Michael Foote, entered by Michael Foote on 01.10.2002, edited by Melanie Hopkins
Creative Commons license: CC BY (attribution)
Taxonomic list
Strophomenata | |
Morinorhynchus crispus7 Lindström 1861 | |
"Brachyprion (Protomegastrophia) sp." = Megastrophia (Protomegastrophia)7, Pholidostrophia (Mesopholidostrophia) lamellosa7
"Brachyprion (Protomegastrophia) sp." = Megastrophia (Protomegastrophia)7 Caster 1939
Pholidostrophia (Mesopholidostrophia) lamellosa7 Zhang 1989 | |
Pentlandina lamelliformis7 Jin and Chatterton 1997
Pentlandina harperi7 Zhang 1989 | |
Rhynchonellata | |
Spirinella tureki7 Havlicek 1990 | |
Hedeina sp.7 Boucot 1957 | |
Merista cuneatina7 Jin and Chatterton 1997 | |
Nucleospira lentilca7 Havlicek 1990 | |
Didymothyris sp.7 Rubel and Modzalevskaya 1967 | |
Atrypoidea linguata7 von Buch 1834
Septatrypa zelia7 Barrande 1879 | |
Gracianella rudicristata7 Jin and Chatterton 1997 | |
Plectatrypa unicosta7 Zhang 1989
Atrypa (Gotatrpa) variabilis7 Johnson et al. 1976 | |
Hercotrema pentaforma7 Lenz 1977 | |
Microbilobata avalanchensis7 Jin and Chatterton 1996 | |
Conchidium microlocularis7 Johnson et al. 1976 | |
Rostroconchia | |
Nehedia bergeraci n. sp.2, Nehedia tricarina n. sp.2, Cassowarioides anisomorpha n. sp.2, Cassowarioides polgari n. sp.2
Nehedia bergeraci n. sp.2 Caldwell and Chatterton 1995
Nehedia tricarina n. sp.2 Caldwell and Chatterton 1995
Cassowarioides anisomorpha n. sp.2 Caldwell and Chatterton 1995
Cassowarioides polgari n. sp.2 Caldwell and Chatterton 1995 | |
Mulceodens johnstoni n. sp.2
Mulceodens johnstoni n. sp.2 Caldwell and Chatterton 1995 | |
Trilobita | |
Mackenziurus reimeri n. gen. n. sp.5, sensu lato Struszia mccartneyi6, Struszia (Avalanchurus) lennoni n. sp.6, Encrinurus "sp. A"6
| |
Diacalymene gabrielsi Siveter and Chatterton 1996 trilobite | |
Richterarges facetus n. sp.4, Borealarges sp.4, Borealarges renodis4, Borealarges tuckerae4, Dicranogmus lepidus3
| |
Cyphaspis lowei n. sp.1
|