Fauna d, Section AV2, Whittaker Fm., Mackenzie Mts. (Silurian of Canada)

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 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..."

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 26036: authorized by Michael Foote, entered by Michael Foote on 01.10.2002, edited by Melanie Hopkins

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Strophomenata
 Strophomenida - Leptellinidae
Leptellina (Merciella) mackenziensis5 Jin and Chatterton 1997
 Strophomenida - Aegiromenidae
Jonesea undulata5 Jin and Chatterton 1997
 Orthotetida - Triplesiidae
Acaretyrricula tenuiguttae5 Jin and Chatterton 1997
Rhynchonellata
 Orthida - Hesperorthidae
Dolerorthis cf. plicata5 de Sowerby and Murchison 1839
 Orthida - Dicoelosiidae
Trilobita
 Odontopleurida - Odontopleuridae
Leonaspis beni trilobite
"Acidaspis (Dalaspis) drzymlai" = Dalaspis trilobite
 Proetida - Aulacopleuridae
 Lichida - Lichidae
Dicranogmus sp.2 Hawle and Corda 1847 trilobite
 Phacopida - Cheiruridae
Youngia johnsoni3 Chatterton and Perry 1984 trilobite
 Phacopida - Encrinuridae
Distyrax sp. n. sp.4 Lane 1988 trilobite
n. sp. A
Perryus bartletti n. sp.4 trilobite