PBDB Collection

James Dick Quarry, lower Verulam (Ordovician of Canada)

Where: Ontario, Canada (44.5° N, 79.2° W: paleocoordinates 23.9° S, 52.2° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Lower Member (Verulam Formation), Katian (453.0 - 445.2 Ma)

• ...material examined is from the James Dick Quarry (44°29’937”N, 79°09’616”W, collection of K. Brett), which is lower Verulam...

• group of beds-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

Collected by J. M. Koniecki, K. Brett; reposited in the UMMP

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

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 192277: authorized by Selina Cole, entered by Selina Cole on 19.03.2018

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

Crinoidea
Myelodactylida - Iocrinidae	Iocrinus trentonensis¹ Iocrinus trentonensis¹ Walcott 1883 Sea lily
Dendrocrinida - Dendrocrinidae	Dendrocrinus ? sp.² Dendrocrinus ? sp.² Hall 1852 Sea lily
Cladida - Plicodendrocrinidae	Plicodendrocrinus proboscidiatus² Plicodendrocrinus proboscidiatus² Billings 1857 Sea lily
Diplobathrida - Rhodocrinitidae	Archaeocrinus maraensis Archaeocrinus maraensis Cole et al. 2018 Sea lily

¹Ausich et al. 2018; ²Wright et al. 2019