PBDB Collection

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

Show authors, comments, and common names

unclassified
-	Songkaia smithi n. sp.¹ Songkaia smithi n. sp.¹
Strophomenata
Orthotetida - Triplesiidae	Acaretyrricula tenuiguttae⁵ Acaretyrricula tenuiguttae⁵ Jin and Chatterton 1997
Strophomenida - Leptellinidae	Leptellina (Merciella) mackenziensis⁵ Leptellina (Merciella) mackenziensis⁵ Jin and Chatterton 1997
Strophomenida - Aegiromenidae	Jonesea undulata⁵ Jonesea undulata⁵ Jin and Chatterton 1997
Rhynchonellata
Orthida - Dicoelosiidae	Epitomyonia sekwiensis⁵ Epitomyonia sekwiensis⁵ Lenz 1977
Orthida - Hesperorthidae	Dolerorthis cf. plicata⁵ Dolerorthis cf. plicata⁵ de Sowerby and Murchison 1839
Trilobita
Proetida - Aulacopleuridae	Aulacopleura andersoni¹ Aulacopleura andersoni¹ trilobite
Phacopida - Encrinuridae	Distyrax sp. n. sp.⁴, Perryus bartletti n. sp.⁴ Distyrax sp. n. sp.⁴ Lane 1988 trilobite n. sp. A Perryus bartletti n. sp.⁴ trilobite
Phacopida - Cheiruridae	"Deiphon" salmoni³, Youngia johnsoni³ "Deiphon" salmoni³ trilobite Youngia johnsoni³ Chatterton and Perry 1984 trilobite
Lichida - Lichidae	Dicranogmus sp.² Dicranogmus sp.² Hawle and Corda 1847 trilobite
Odontopleurida - Odontopleuridae	Stelckaspis tuberculosa, Stelckaspis gingiva, Stelckaspis warreni, "Acidaspis (Dalaspis) drzymlai" = Dalaspis, Leonaspis beni, Ceratocephala avalanchensis Stelckaspis tuberculosa trilobite Stelckaspis gingiva trilobite Stelckaspis warreni trilobite "Acidaspis (Dalaspis) drzymlai" = Dalaspis trilobite Leonaspis beni trilobite Ceratocephala avalanchensis trilobite

¹Adrain and Chatterton 1995; ²Campbell and Chatterton 2006; ³Chatterton and Perry 1984; ⁴Edgecombe and Chatterton 1992; ⁵Jin and Chatterton 1997