Submitted on 2012-03-13 by Joseph Koniecki

Location (approximate): Alpena, Alpena, MI

Strat unit: Alpena formation

Submitter notes: This specimen is 3 cm tall.

Photo title: Crinoid

Taxa present: Euryocrinus barrisi

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Submitted on 2012-03-13 by Joseph Koniecki

Location (approximate): Alpena, Alpena, MI

Strat unit: Alpena formation

Submitter notes: This specimen is 5 cm across.

Photo title: Crinoid crown

Taxa present: Pithocrinus cooperi

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Submitted on 2012-03-13 by Joseph Koniecki

Location (approximate): Alpena, Alpena, MI

Strat unit: Alpena formation

Submitter notes: This specimen is 6 cm tall.

Photo title: Crinoid crown

Taxa present: Pithocrinus cooperi

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Submitted on 2012-05-02 by David Clark

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: A snail found in a unique position on a crinoid. Most gastropods attach to the calyx, not the stem.

Photo title: Platyceras conicum gastropod on a crinoid stem

Taxa present: Platyceras conicum

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Submitted on 2012-05-02 by David Clark

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: Very tiny blue fish tooth is about 1 mm long

Photo title: Unidentified Devonian fish tooth

Taxa present: Unknown

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Submitted on 2012-06-17 by Joseph Koniecki

Location (approximate): Alpena, Alpena, MI

Strat unit: Alpena formation

Submitter notes: This is a very rare crinoid from the Thunder Bay formation. It measures 3 cm tall.

Photo title: Crinoid crown

Taxa present: Cunctocrinus sp.

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Submitted on 2012-07-03 by Joseph Koniecki

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: This specimen is 12 cm tall.

Photo title: Bryozoan

Taxa present: Fistulipora sp.

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Submitted on 2019-05-12 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: attached to matrix

Photo title:

Taxa present: Placoblastus obovastus

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Submitted on 2019-05-12 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: None

Photo title: Detail of previous specimen showing ambulacra.

Taxa present: Placoblastus obovastus

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Submitted on 2019-05-12 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: showing attachment area.

Photo title: stem end of previous Blasted photo

Taxa present: Placoblastus obovastus

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Submitted on 2012-07-04 by David Thompson

Location (approximate): Paulding, Paulding, OH

Strat unit: Silica formation

Submitter notes: This is a large example of Tentaculities at 2 cm (.78 inches) from the Silica formation of Paulding, Ohio. These are not too common at Paulding and this is a larger then average specimen.

Photo title: Large Tentaculities from Silica of Ohio

Taxa present: Tentaculities scalariformis

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Submitted on 2012-07-04 by David Thompson

Location (approximate): Rockport, Alpena, MI

Strat unit: Bell formation

Submitter notes: This species, Gennaeocrinus variables, which is very tiny, 1.176 cm (0.69 inches), can still be host to a snail as a rare parasite(?). The gastropod is too tiny for good species identification and is covered with bryozoan. Alex Fabian was generous to give me these from the Tom Witherspoon, Sr. collection knowing my interest in these Crinoid/snail association

Photo title: Tiny crinoid with gastropod attached to tegmen

Taxa present: Gennaeocrinus variabilis, Platyceras

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Submitted on 2012-07-04 by David Thompson

Location (approximate): Rockport, Alpena, MI

Strat unit: Bell formation

Submitter notes: This crinoid is 1.03 cm, (.40 inches) wide by .84 cm ( .33 inches) high. The snail is .91 (35 inches) long. The crinoid is the size of a large pea! These are from the Bell Shale at Rockport, Mi North of Alpena.

Photo title: A different example of tiny crinoid and snail.

Taxa present: Gennaeocrinus variabilis, Platyceras

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Submitted on 2012-07-04 by David Thompson

Location (approximate): Rockport, Alpena, MI

Strat unit: Bell formation

Submitter notes: These additional three Genneaocrinus all have partial snails attached to their tegmens. Due to the partial status these are put together rather then showcased individually. All these were from the same source in the Bell shale

Photo title: A set of three Small crinoid calyxes with fragments of snail attachments

Taxa present: Gennaeocrinus variabilis, Platyceras

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Submitted on 2012-07-04 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This nice complete crinoid calyx in matrix shows tegmen ornamentation as well as arm attachments for this Pithocrinus cooperi. The crinoid is 1.37 inches,(3.12 cm) high by 1.38 inches,(3.5 cm) wide. The matrix is 2.71 inches, (6.8 cm) wide by 3.2 inches, (8.1 cm) long

Photo title: Complete crinoid calyx

Taxa present: Pithocrinus cooperi

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Submitted on 2012-07-04 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This complete crown although it was broken half way up was easily put back together with no loss. The crown with arms is 3 inches, (7.5 cm) high by 1.57 inches, (4. cm) wide. A ten cent piece is for scale.

Photo title: Complete Crinoid Crown, side 1

Taxa present: Pithocrinus cooperi

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Submitted on 2012-07-04 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This is the opposite side of the previous crinoid. The same dimensions apply.

Photo title: Reverse side

Taxa present: Pithocrinus cooperi

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Submitted on 2012-07-04 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This nice large calyx shows the varied ornamentation that leads to the name 'multidecoratus'

Photo title: ornamented crinoid calyx

Taxa present: Megistocrinus multidecoratus

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Submitted on 2012-07-04 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Partridge Point formation

Submitter notes: This view of the Tegmen of a Megistocrinus rugosus shows the base of a platyceras snail but it also has been called a fragment of an inarticulate brachiopod. In either case the majority of the attached specimen was scraped off during its many millions of years underground. What's your opinion?

Photo title: Crinoid tegmen with fragment of snail(?)

Taxa present: Megistocrinus rugosus, Platyceras

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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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