Submitted on 2011-11-05 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This shows to good effect the varied decorations on the calyx of this species of Megistocrinus. This very large Caylx comes from Partridge Point in Alpena. Unfortunately the entire opposite side is covered with a very hard limey Bryazoan that completely obscures it and only this side, bottom and tegmen could be cleaned and seen.

Photo title: Large Caylx of Megiatocrinus multidecoratus from Alpena

Taxa present: Megistocrinus multidecoratus

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Submitted on 2011-11-05 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This shows a slightly different view with natural coloring to show the decorations.

Photo title: A differing view of the Megistocrinus

Taxa present: Megistocrinus multidecoratus

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Submitted on 2012-01-11 by Joseph Koniecki

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: The picture is a view of the cup and tegmen of the same specimen. The calyx is 3 cm across.

Photo title: Crinoid calyx

Taxa present: Dolatocrinus barrisi

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Submitted on 2012-01-11 by Joseph Koniecki

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: The picture is a view of both sides of the same specimen. The calyx is 5 cm across.

Photo title: Crinoid calyx

Taxa present: Megistocrinus nodosus

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Submitted on 2012-01-11 by Joseph Koniecki

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: The picture is a view of the cup and tegmen of the same specimen. The calyx is 2.5 cm across

Photo title: Crinoid calyx

Taxa present: Dolatocrinus romingeri

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Submitted on 2012-01-11 by Joseph Koniecki

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: The picture is a view of the cup and tegmen of the same specimen. The calyx is 2 cm across

Photo title: Crinoid calyx

Taxa present: Dolatocrinus romingeri

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Submitted on 2012-01-11 by Joseph Koniecki

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: The picture is a view of the cup and tegmen of the same specimen with a coral growing around the base of the cup. The calyx is 3.5 cm across

Photo title: Crinoid calyx with coral

Taxa present: Dolatocrinus romingeri, Antholites alpenensis

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Submitted on 2012-01-11 by Joseph Koniecki

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: The picture is a view of both sides of the same specimen. The calyx is 4 cm across

Photo title: Crinoid calyx

Taxa present: Megistocrinus multidecoratus

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Submitted on 2012-01-11 by Joseph Koniecki

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: The picture is a view of the cup and tegmen of the same specimen. The calyx is 5 cm across

Photo title: Crinoid calyx

Taxa present: Megistocrinus multidecoratus

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Submitted on 2012-03-12 by Joseph Koniecki

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This calyx is 2.8 cm across.

Photo title: Crinoid calyx

Taxa present: Dolatocrinus romingeri

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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): 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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Submitted on 2012-11-28 by Joseph Koniecki

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This specimen is 4.5 cm across.

Photo title: Crinoid calyx

Taxa present: Megistocrinus multidecoratus

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