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 2013-08-19 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 2015-12-24 by Mike Palescuk

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Decorocrinus arkonensis (McIntosh 2001), formerly Botryocrinus. Found in 1976. 65 pieces painstakingly re-assembled into this 2-7/8" long

Photo title: Crinoid

Taxa present: Decorocrinus arkonensis

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Submitted on 2015-12-20 by Michael Lask

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: The stem alone is 137 mm long. Collected and prepared by Patricia Rutkowski. This incredible specimen is on a chunk of Arkona Shale that is over 15 inches long. Pat spent countless hours preparing this classic crinoid.

Photo title: Crinoid

Taxa present: Arthroacantha carpenteri

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Submitted on 2015-12-20 by Michael Lask

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: 70 mm across

Photo title:

Taxa present: Tentaculites bellulus

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Submitted on 2018-03-13 by Joseph Koniecki

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This crinoid is 1.1 cm tall.

Photo title: Crinoid calyx

Taxa present: Atractocrinus concinnus

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Submitted on 2018-12-15 by Joseph Koniecki

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: The specimen is 1.5 cm across.

Photo title: Pelecypod

Taxa present: Paracyclas lirata

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Submitted on 2019-09-26 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This brachiopod pavement specimen measures 4.25" X 3.0" x 0.75". Devonochonetes is common throughout the formation as single specimens, rarer as a pavement. Redescribed by Junhui Wang in 2009.

Photo title: BRACHIOPOD PAVEMENT

Taxa present: Devonochonetes arkonensis

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Submitted on 2019-09-26 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Beautiful pyritized specimen showing the oral side up on matrix measuring 8.5" X 4.5".

Photo title: STARFISH

Taxa present: Devonaster triradiatus

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Submitted on 2019-09-26 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Close-up view of the previous specimen on slab measuring 8.5" X 4.5". About 2.0" in diameter.

Photo title: STARFISH

Taxa present: Devonaster triradiatus

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