ammonites
Fauna i, Section AV1, Whittaker Fm., Mackenzie Mts. (Silurian to of Canada)

Where: Northwest Territories, Canada (62.4° N, 127.0° W: paleocoordinates 7.2° N, 52.1° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Pterospathodus amorphognathoides zone, Whittaker Formation, Llandovery to Llandovery (443.7 - 422.9 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: deep subtidal 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." Grand Cycle 1-2 transition.

•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 26034: authorized by Michael Foote, entered by Michael Foote on 01.10.2002