Section AV3, 005m, Mackenzie Mts., Avalanche Lake, Fauna d (Silurian of Canada)

Also known as AV3 5m

Where: Northwest Territories, Canada (62.4° N, 127.0° W: paleocoordinates 9.0° N, 54.0° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Pterospathodus celloni conodont zone, Whittaker Formation, Llandovery (443.4 - 433.4 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.)

• group of beds-level stratigraphic resolution

Environment/lithology: offshore shelf; argillaceous limestone and calcareous shale

• "The strata assigned to the Whittaker Formation in these sections are largely deeper water platform margin or upper slope limestones and shales." Shallower upper half of Grand Cycle 2.

•SEP environmental call based on given information

• Whittaker Fm. in general: "Beneath a distinctive buff-brown coloured shale unit, assigned to the base of the Delorme Fm., the strata consist of interbedded argillaceous limestones, calcareous shales, and cherty dolomites...The more carbonate-rich horizons contain rich silicified trilobite, conodont, and ostracode faunas. They also contain sparser coral, bryozoanb, brachiopod, mollusc, and other invertebrate faunas..."

Size class: macrofossils

Preservation: replaced with silica

Primary reference: B. D. E. Chatterton and D. G. Perry. 1983. Silicified Silurian odontopleurid trilobites from the Mackenzie Mountains. Palaeontographica Canadiana 1:1-55 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 26043: authorized by Michael Foote, entered by Michael Foote on 01.10.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Songkaia smithi n. sp.1
Rostroconchia
 Conocardiida - Hippocardiidae
Hippocardiidae indet.2
Hippocardiidae indet.2 Pojeta and Runnegar 1976
Trilobita
 Proetida - Aulacopleuridae
Aulacopleura andersoni1
 Phacopida - Encrinuridae
Cromus canorus n. sp.3, Perryus bartletti n. sp.3
Cromus canorus n. sp.3 trilobite
Perryus bartletti n. sp.3 trilobite
 Odontopleurida - Odontopleuridae
Stelckaspis tuberculosa, Stelckaspis gingiva, "Acidaspis (Dalaspis) drzymlai" = Dalaspis, Ceratocephala avalanchensis
"Acidaspis (Dalaspis) drzymlai" = Dalaspis trilobite
1Adrain and Chatterton 1995; 2Caldwell and Chatterton 1995; 3Edgecombe and Chatterton 1992