Fauna x, Section AV5, Delorme Fm., Mackenzie Mts. (Silurian of Canada)

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

• Grand Cycle 3.

•SEP environmental call based primarily on PBDB ref. 7215.

• "...sequence of buff and light brown weathering, thinly bedded limestones, dolomites and shales that overlie the Whittaker Formation and underlie the Camsell Formation...The beds above and including a distinctive buff-brown shale unit in the sections near Avalanche Lake are included in the Delorme Formation in this work, although the lowest buff-brown shaly beds (below distinctive orange coloured limestones and dolomites) could be regarded as transitional between the Road River and Delorme..." (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

 Strophomenida - Strophodontidae
"Brachyprion (Protomegastrophia) sp." = Megastrophia (Protomegastrophia)7 Caster 1939
 Strophomenida - Furcitellidae
Pentlandina harperi7 Zhang 1989
Pentlandina lamelliformis7 Jin and Chatterton 1997
 Orthotetida - Chilidiopsidae
Morinorhynchus crispus7 Lindström 1861
 Rhynchonellida - Trigonirhynchiidae
 Spiriferida - Cyrtiidae
Hedeina sp.7 Boucot 1957
 Spiriferida - Reticulariidae
Spirinella tureki7 Havlicek 1990
 Terebratulida -
Microbilobata avalanchensis7 Jin and Chatterton 1996
 Athyridida - Meristidae
Merista cuneatina7 Jin and Chatterton 1997
 Athyridida - Athyrididae
Didymothyris sp.7 Rubel and Modzalevskaya 1967
 Athyridida - Nucleospiridae
Nucleospira lentilca7 Havlicek 1990
 Atrypida - Septatrypidae
Atrypoidea linguata7 von Buch 1834
Septatrypa zelia7 Barrande 1879
 Atrypida - Atrypinidae
Gracianella rudicristata7 Jin and Chatterton 1997
 Atrypida - Atrypidae
Atrypa (Gotatrpa) variabilis7 Johnson et al. 1976
Plectatrypa unicosta7 Zhang 1989
 Pentamerida - Subrianidae
Conchidium microlocularis7 Johnson et al. 1976
 Conocardiida - Pseudobigaleaidae
Cassowarioides anisomorpha n. sp.2 Caldwell and Chatterton 1995
Cassowarioides polgari n. sp.2 Caldwell and Chatterton 1995
Nehedia bergeraci n. sp.2 Caldwell and Chatterton 1995
Nehedia tricarina n. sp.2 Caldwell and Chatterton 1995
 Conocardiida - Bransoniidae
Mulceodens johnstoni n. sp.2 Caldwell and Chatterton 1995
 Proetida - Otarionidae
Cyphaspis lowei n. sp.1 trilobite
 Lichida - Lichidae
Borealarges sp.4 Adrain 1994 trilobite
Borealarges tuckerae4 Adrain 1994 trilobite
Borealarges renodis4 Campbell and Chatterton 2007 trilobite
Dicranogmus lepidus3 Campbell and Chatterton 2006 trilobite
Richterarges facetus n. sp.4 Campbell and Chatterton 2007 trilobite
58 - 60 m
 Phacopida - Encrinuridae
sensu lato Struszia mccartneyi6 trilobite
S. (s.l.)
Mackenziurus reimeri n. gen. n. sp.5 trilobite
Encrinurus "sp. A"6 Emmrich 1844 trilobite
 Phacopida - Calymenidae
sensu lato Calymene cf. polgari Siveter and Chatterton 1996 trilobite
C. (s.l.)
Diacalymene gabrielsi Siveter and Chatterton 1996 trilobite