Kirkfield Quarry, middle-lower Bobcaygeon (Ordovician of Canada)

Where: Ontario, Canada (44.6° N, 79.0° W: paleocoordinates 23.9° S, 52.0° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Middle - Upper Member (Bobcaygeon Formation), Katian (453.0 - 445.2 Ma)

• ...material examined is from...the classic Kirkfield Quarry (44°35'6.32''N, 78°58'8.16''W), which is middle–lower Bobcaygeon

• member-level stratigraphic resolution

Environment/lithology: shallow subtidal; lithified, hardground, calcareous wackestone and lithified, hardground, calcareous siltstone

• The paleoenvironments in which the Bobcaygeon and Verulam formations were deposited have been interpreted as a proximal carbonate shelf that ranged in depth and proximity from shoal to shallow shelf in the Bobcaygeon and from deep shelf to shoal/shallow shelf in the Verulam (Armstrong, 2000).
• Both the Bobcaygeon and Verulam formations are comprised of bioclastic wackestones, grainstones, and packstones interbedded with calcareous shales and siltstones. The Verulam contains more shale than the underlying Bobcaygeon Formation (Liberty, 1969). Several hardgrounds have been documented in detail from the upper Bobcaygeon and lower Verulam (Brett and Liddell, 1978; Brett and Brookfield, 1984; Brett and Taylor, 1999).

Size classes: macrofossils, mesofossils

• ...numerous exceptionally preserved crinoid specimens with arms, stems, and attachment structures intact.

Preservation: original calcite

Reposited in the USNM

Collection methods: quarrying, surface (float), surface (in situ)

• Other material is reposited in the Cincinnati Museum Center Invertebrate Paleontology Collection

Primary reference: S. R. Cole, W. I. Ausich, D. F. Wright and J. M. Koniecki. 2018. An echinoderm Lagerstätte from the Upper Ordovician (Katian), Ontario: taxonomic re-evaluation and description of new dicyclic camerate crinoids. Journal of Paleontology 1-18 [S. Cole/S. Cole]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 192278: authorized by Selina Cole, entered by Selina Cole on 19.03.2018, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Asteroidea
 Hadrosida - Palaeasteridae
Sertulaster keslingi2
Sertulaster keslingi2 Blake and Koniecki 2019 sea star
Crinoidea
 Hybocrinida - Hybocystitidae
Hybocystites problematicus1
Hybocystites problematicus1 Wetherby 1880 Sea lily
 Hybocrinida - Hybocrinidae
Hybocrinus tumidus1
Hybocrinus tumidus1 Billings 1857 Sea lily
 Calceocrinida - Calceocrinidae
Cremacrinus inaequalis1, Cremacrinus guttenbergensis1
Cremacrinus inaequalis1 Billings 1859 Sea lily
Cremacrinus guttenbergensis1 Kolata 1975 Sea lily
 Homocrinida - Cincinnaticrinidae
"Isotomocrinus tenuis" = Cincinnaticrinus varibrachialus1
"Isotomocrinus tenuis" = Cincinnaticrinus varibrachialus1 Warn and Strimple 1977 Sea lily
 Diplobathrida - Cleiocrinidae
Cleiocrinus lepidotus n. sp., Cleiocrinus regius
Cleiocrinus lepidotus n. sp. Cole et al. 2018 Sea lily
Cleiocrinus regius Billings 1857 Sea lily
 Rhombifera - Pleurocystitidae
Amecystis laevis3
Amecystis laevis3 Raymond 1921
1Ausich et al. 2018; 2Blake and Koniecki 2019; 3Parsley 1970