Fauna a, Section AV1, Whittaker Fm., Mackenzie Mts. (Silurian of Canada)

Where: Northwest Territories, Canada (62.4° N, 127.0° W: paleocoordinates 9.8° N, 54.8° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Distomodus kentuckyensis conodont zone, Whittaker Formation, Aeronian (440.8 - 438.5 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.)

•Was Llandovery, but D. kentuckyensis zone is Aeronian.

• group of beds-level stratigraphic resolution

Environment/lithology: deep subtidal shelf; argillaceous limestone and calcareous shale

• Later part of Sedimentary Grand Cycle 1. "The strata assigned to the Whittaker Formation in these sections are largely deeper water platform margin or upper slope limestones and shales."

•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..." Based on stratigraphic chart, Faunal assemblage a is from argillaceous limestone.

Size classes: macrofossils, mesofossils

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 26027: 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
 Strophomenida - Furcitellidae
Katastrophomena parvicardinis5 Jin and Chatterton 1997
 Strophomenida - Rafinesquinidae
"Leptaena haverfordensis" = Leptaena (Leptaena) haverfordensis5
"Leptaena haverfordensis" = Leptaena (Leptaena) haverfordensis5 Bancroft 1949
Rhynchonellata
 Atrypida - Cyclospiridae
Cyclospira sp.5 Hall and Clarke 1893
 Protorthida - Skenidiidae
Skenidioides operosa5 Johnson et al. 1976
 Orthida - Dalmanellidae
 Orthida - Dicoelosiidae
Trilobita
 Odontopleurida - Odontopleuridae
 Proetida - Aulacopleuridae
Harpidella tikkaneni n. sp.2 trilobite
Maurotarion messieri n. sp.2 trilobite
? Aulacopleura ranfordi n. sp.1 trilobite
 Lichida - Lichidae
Platylichas infimus n. sp.3 Campbell and Chatterton 2006 trilobite
 Phacopida - Encrinuridae
Curriella clancyi n. sp.4 Edgecombe and Chatterton 1990 trilobite
84.5 - 97.5 m
 Phacopida - Calymenidae
Calymene sp. n. sp.6
Calymene sp. n. sp.6 Brongniart 1822 trilobite