Section AV3 062m, Avalanche Lake, Fauna f (Silurian of Canada)

Also known as AV3-62; AV3 62 m

Where: Northwest Territories, Canada (62.4° N, 127.0° W: paleocoordinates 8.3° N, 53.2° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Pterospathodus celloni zone, 3W Member (Whittaker Formation), Telychian (438.5 - 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 26044: authorized by Michael Foote, entered by Michael Foote on 01.10.2002, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

 Odontopleurida - Odontopleuridae
 Aulacopleurida - Aulacopleuridae
 Phacopida - Encrinuridae
Billevittia adraini3 Edgecombe and Ramsköld 1996 trilobite
 Phacopida - Cheiruridae
"Youngia folinsbeei" = Parayoungia folinsbeei2 Chatterton and Perry 1984 trilobite
Youngia walli2 trilobite
Youngia boucoti2 Chatterton and Perry 1984 trilobite
Youngia kathyae2 Chatterton and Perry 1984 trilobite
 Conocardiida - Bransoniidae
"Bransonia foxi n. sp." = Mulceodens foxi4
"Bransonia foxi n. sp." = Mulceodens foxi4 Johnston and Chatterton 1983