Submitted on 2013-01-24 by ummp invertebrate paleontology

Location (approximate): Alpena, Alpena, MI

Strat unit: Four Mile Dam formation

Submitter notes: This specimen is 2.5 cm across including the matrix.

Photo title: Bachiopod

Taxa present: Douvillina distans

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Submitted on 2013-01-24 by ummp invertebrate paleontology

Location (approximate): Thedford, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: This specimen is 2.1 cm across.

Photo title: Bachiopod

Taxa present: Delthyris sp.

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Submitted on 2013-02-07 by David Thompson

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: This is a rare example of this crinoid, Deltacrinus from the Hungry Hollow Formation in Ontario, Canada. I had the help of our resident experts in the Arkona fossil formations; John and Mike Topor in identifying this genus, but we are not sure of the species so its a (?). The height with the arms is .9' or 2.29 cm. The width is .75' or 1.9 cm. The stem attached is about .69' or 1.1 cm.

Photo title: unusual crinoid caylx from Arkona

Taxa present: Deltacrinus sp.

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Submitted on 2013-02-07 by David Thompson

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: The caylx from reverse.

Photo title: Opposite side of Deltacrinus

Taxa present: Deltacrinus sp.

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Submitted on 2013-02-07 by David Thompson

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This Cadiscocrinus crown with arms is quite unusual in that several of the arms were broken (or eaten?) The arm tips on the left of this photo show three light pink arm tips that have been regrown by the crinoid prior to its final burial. This comes from the Arkona Formation of the Arkona area. Again our experts, John and Mike Topor clarified the identification of this crinoid as southworthi. The fossil is on loan to the Museum of Paleontology for research.

Photo title: Another rare Devonian crinoid crown with arm regeneration

Taxa present: Cadiscocrinus southworthi

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Submitted on 2013-02-07 by David Thompson

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This shows the crown and arms for identification. There is a slight view of a regenerating arm on the extreme right but it's hard to notice. The base of the crown is visible. Total height of matrix is 1.85' or 4.7 cm, the arms are 1.4' or 3.7 cm, the width of the caylx is .5' or 1.2 cm. The width of the arms and matrix is 1.1' or 2.8 cm at their widest. This crinoid is named after the famous Thedford, Ontario collector; Charles Southworth.

Photo title: Reverse of previous crown of Cadiscocrinus

Taxa present: Cadiscocrinus southworthi

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Submitted on 2013-03-04 by David Thompson

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Cadiscocrinus southworti from the Arkona formation of Ontario, Canada. This is smaller then the example just given and is .49' or 1.2 cm wide and .97' or 2.4 cm tall including arms. Roughly 1/2 inch by 1 inch.

Photo title: Another example of rare Arkona Crinoid; Cadiscocrinus southworthi

Taxa present: Cadiscocrinus southworthi

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Submitted on 2013-03-04 by David Thompson

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This is the less well preserved reverse side of the previous crinoid

Photo title: Reverse side of Cadiscocrinus just shown.

Taxa present: Cadiscocrinus southworthi

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Submitted on 2013-06-09 by David Thompson

Location (approximate): Paulding, Paulding, OH

Strat unit: Silica formation

Submitter notes: Pseudodechenella lucasensis from the Silica shale of LaFarge Quarry at Paulding, Ohio. The trilobite is 2.8 cm or 1.1' long by 2.1 cm or .8 ' wide at the genal spines. The matrix is 10.8 cm or 4.3' long by 5.6 cm or 2.2' wide.

Photo title: Dechenella Trilobite

Taxa present: Pseudodechenella lucasensis

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Submitted on 2013-06-09 by David Thompson

Location (approximate): Paulding, Paulding, OH

Strat unit: Silica formation

Submitter notes:

Photo title: Head of Dechenella in previous photo

Taxa present: Pseudodechenella lucasensis

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Submitted on 2013-07-23 by Joseph Koniecki

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: Crinoids in general are very rare in the Hungry Hollow member of the Widder formation. This is a rare example of an intact crinoid calyx. It measures 4 cm in diameter.

Photo title: Crinoid Calyx

Taxa present: Megistocrinus rugosus

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Submitted on 2013-07-23 by Joseph Koniecki

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: This blastoid is 1.3 cm tall. The side and top view are of the same specimen.

Photo title: Blastoid

Taxa present: Heteroschisma alatus

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Submitted on 2013-08-19 by David Thompson

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This shows the detail of pinnules on the feeding arms. There are several blobs of pyrite on the arms also.

Photo title: Rare Crinoid Calyx

Taxa present: Gennaeocrinus mourantae

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Submitted on 2013-08-19 by David Thompson

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This is another view of this rare crinoid that shows a small gastropod to the extreme right that is NOT attached to this crinoid but associated with it.

Photo title: Second view of crinoid

Taxa present: Gennaeocrinus mourantae

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Submitted on 2013-09-10 by Darrell Ellis

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Collected from the upper Arkona Formation; I am told this is the most complete Atractocrinus concinnus found to date.

Photo title: Atractocrinus concinnus (Photo 1/2)

Taxa present: Atractocrinus concinnus

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Submitted on 2013-09-10 by Darrell Ellis

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Collected from the upper Arkona Formation; I am told this is the most complete Atractocrinus concinnus found to date.

Photo title: Atractocrinus concinnus (Photo 2/2)

Taxa present: Atractocrinus concinnus

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Submitted on 2014-01-07 by David Thompson

Location (approximate): Aberfeldy, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: The width of the arm spread is 70 mm, The overall matrix is 90 mm wide by 8.5 cm high. The tiny calyx is 7 mm, and the stem is about 11 mm long

Photo title: Corocrinus Crinoid

Taxa present: Corocrinus Sp.

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Submitted on 2014-01-07 by David Thompson

Location (approximate): Aberfeldy, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: Two different preservations. the one on the right having more pyrite. The matrix is 11 cm by 9 cm

Photo title: Double Corocrinus Plate

Taxa present: Corocrinus P.

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Submitted on 2021-08-16 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This complete pyritized calyx shows the dramatic arm branching bifurcating again and again.

Photo title: Pyritized Crinoid Calyx

Taxa present:

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Submitted on 2014-01-07 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: Calyx base showing tiny attachment points for tiny spines used to protect against invaders. These are often preserved but not in this case. The calyx is 6.5 cm tall by 5 cm wide

Photo title: Crinoid base.

Taxa present: Athroacantha carpenteri

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