Submitted on 2012-07-04 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This is a partially crushed snail on the tegmen of a Pithocrinus cooperi. The calyx is 1.76 cm, (.69 inches) high by 2.23 cm (.88 inches) wide and, although crushed, the snail is complete and attached.

Photo title: crushed Platyceras on crinoid calyx

Taxa present: Pithocrinus cooperi, Platyceras

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Submitted on 2012-10-27 by David Thompson

Location (approximate): Arkona, Lambton, ON

Strat unit: Widder formation

Submitter notes: Fully replaced by pyrite, this enrolled Greenops widerensis shows a gold color but has a lack of surface detail. Scott Vergiels has worked his magic in preparation to show off the maximum amount of the specimen which 3.18 cm or 1.25 inches long by 1.8 cm or .7 inches wide across the genal spines.

Photo title: 'Gold Bug' Pyritized Trilobite

Taxa present: Greenops widderensis

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Submitted on 2012-10-27 by David Thompson

Location (approximate): Arkona, Lambton, ON

Strat unit: Widder formation

Submitter notes: As noted surface detail is missing due to the pyrite replacement.

Photo title: Head on view of same specimen

Taxa present: Greenops widderensis

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Submitted on 2012-10-27 by David Thompson

Location (approximate): Arkona, Lambton, ON

Strat unit: Widder formation

Submitter notes: Two Greenops widderensis on one plate. Both are complete but one has the head rolled under the body and is partly disarticulated. The largest has the complete tail on the reverse shown in another view in this group. The largest is 1.9 cm wide at the cheeks and would be about 3.5 cm or 1.4 inches long if laid flat. The disarticulate one is almost the same width but length is hard to measure.

Photo title: Double trilobite plate

Taxa present: Greenops widderensis

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Submitted on 2012-10-27 by David Thompson

Location (approximate): Arkona, Lambton, ON

Strat unit: Widder formation

Submitter notes:

Photo title: More detail of largest of previous double plate

Taxa present: Greenops widderensis

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Submitted on 2012-10-27 by David Thompson

Location (approximate): Arkona, Lambton, ON

Strat unit: Widder formation

Submitter notes:

Photo title: Pygidium of previous specimen

Taxa present: Greenops widderensis

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Submitted on 2012-10-27 by David Thompson

Location (approximate): Arkona, Lambton, ON

Strat unit: Widder formation

Submitter notes: The overal length is 8.3 cm long by 4.3 cm wide or 3.3 inches by 1.7 inches.

Photo title: View with second specimen more clearly shown

Taxa present: Greenops widderensis

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Submitted on 2013-01-20 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This crinoid was collected in May, 1963 but not prepared or cleaned until now. This is a interesting Arthroacantha carpenteri from unit 13 of the Silica formation in Sylvania, OH. It was collected by Tom Witherspoon, Sr. and shows the lovely 'Sunflower' pattern of the crinoid crown with the arms displayed. In this case, some creature has disrupted or eaten the arm bases at the top of the specimen and the remaining arms are at a lower level then the calyx. The entire plate is 22 cm by 13 cm (8 1/2' by 5 1/4'), the stem is 8 cm or 3 1/4' long, Maximum arm spread is 15 cm or 6' wide.

Photo title: Crinoid plate

Taxa present: Arthroacantha carpenteri

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Submitted on 2013-01-20 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This is a slightly larger view of the previous crinoid to encompass more of the total plate.

Photo title: Crinoid plate #2

Taxa present: Arthroacantha carpenteri

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Submitted on 2013-01-20 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This is a very large example of the caylx of a Megistocrinus multidecoratus from the Thunder Bay Limestone of Partridge point in Alpena. It weighs 7 ounces and is nearly 2 inches high by 3 inches wide, a monster from this location

Photo title: Large Crinoid Caylx

Taxa present: Megistocrinus multidecoratus

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Submitted on 2013-01-20 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Bell formation

Submitter notes: These three crinoid caylxes were found in year 2012 and all were found within a 2 foot space of ground. One can go years not seeing these then a special find of all three at once! These Gennaeocrinus variables are all complete, the smallest on the left is .3' or .77 cm, the largest in the middle is .4' or 1.1 cm tall by .4 or 1.0 cm wide. These were all in pristine condition and required no cleaning.

Photo title: Three tiny crinoid calyxes

Taxa present: Gennaeocrinus variabilis

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Submitted on 2013-01-20 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This nearly complete crinoid is disarticulated in parts of the lower stem and the arms have been scraped it appears. Some of the column may still be hidden under the Bryozoan fronds that make up much of the limestone of the matrix which is 7' by 5 1/4' or 18 cm by 13.5 cm. The crown itself is 1 1/2' or 3 cm high and the arms range from 1/2' or 1.2 cm to 1' or 2.5 cm wide.

Photo title: Another almost complete crinoid on matrix

Taxa present: Aorocrinus cassedayi

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Submitted on 2013-01-20 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes:

Photo title: Same crinoid but in black and white to show crown detail

Taxa present: Aorocrinus cassedayi

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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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