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 2013-08-19 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 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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Submitted on 2014-04-27 by David Thompson

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: Oddly, we missed posting an image of one of the loveliest brachiopods of the Middle Devonian Silica shale! This was brought to my attention by M. Palescuk while we were collecting at Milan, MI so I am taking this time to post one of the nice robust examples of this species that is characteristic of this site. This Brachiopod is 3.3 cm wide by 2.5 cm by 2. cm thick. A second photo follows with some more examples of this brachiopod.

Photo title: Schizophoria brachiopod

Taxa present: Schizophoria ferronensis

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Submitted on 2014-04-27 by David Thompson

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: This photo shows several other examples from the same site including the main example. the smallest here is 1 cm by .8cm. These brachiopods are so finely lined they rarely have epifauna other then Spiorbis on them.

Photo title: Several Schizophoria examples

Taxa present: Schizophoria ferronensis

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Submitted on 2014-05-12 by David Thompson

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: These examples of this Cyrtina are from the old Martin-Marietta quarry of Silica shale spoil piles in Milan, Mi. This closed area has a large number of these particular Cyrtinas. These were just collected in 2014.

Photo title: Cyrtina umbonata alpenensis

Taxa present: Cyrtina umbonata alpenensis

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Submitted on 2014-05-26 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Bell formation

Submitter notes: The Bell shale is quite sparse and finding this crinoid with Platyceras attached was rare & unusual. The tegmen has been scraped open to reveal the attachment of the snail to the crinoid.

Photo title: Crinoid with Snail.

Taxa present: Gilbertsocrinus alpenensis

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Submitted on 2014-05-26 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Bell formation

Submitter notes: This is the base view of the crinoid with snail. The Platyceras is visible at lower left. There is even a small bryozoan on the Platyceras. The base, including the snail, is 20mm wide by 16 mm tall by 12 mm. deep. Collected 5-23-14

Photo title: base of crinoid

Taxa present: Gilbertsocrinus alpenensis

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Submitted on 2014-07-08 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: This is an infested crinoid stem with multiple small borings of a parasitic worm: Myzostomida. This has 9 borings in this one stem section. Not too much is known about these galls or tumors as they are also called. They are not too common.

Photo title: Parasitic gall on crinoid columnal

Taxa present: Myzostomida

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Submitted on 2014-07-08 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: The Myzostomida are an order of small marine polychaete worms, which are parasitic on crinoids causing gall swelling and holes but rarely leaving any other trace.

Photo title: Parasitic gall on crinoid

Taxa present: Myzostomida

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Submitted on 2014-10-03 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This large Brachiopod is encrusted with Aulopora microbuccinata which has grown over the lip of the Brachiopod meaning it was probably dead. The brachiopod is 6.1 cm wide by 4.1 cm long and 4.4 cm deep. This is heavily piritized as are many of the Sylvania fossils.

Photo title: Coral on Brachiopod

Taxa present: Aulopora microbuccinata

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Submitted on 2014-10-02 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This is a side view of the previous Brachiopod.

Photo title: Another view

Taxa present: Paraspirifer bownockeri

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Submitted on 2014-10-02 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This is a different brachiopod from the same location also encrusted with Aulopora microbuccianata. It also show a small hole in the shell that looks like a snail boring. This Brachiopod is 7. cm wide, 4.6 cm long and 4.3 cm thick.

Photo title: Another Brachiopod with corals

Taxa present: Paraspirifer bownockeri

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Submitted on 2014-10-02 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: Here is a large Bownockeri with a huge inarticulate Petrocrania hamiltonae attached. Inarticulates do not get much bigger then this. The Brachiopod is 5.6 cm wide, 4.2 cm long and 4.1 cm deep. The inarticulate is 2 cm around

Photo title: Large Brachiopod with Inarticulate.

Taxa present: Paraspirifer bownockeri

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Submitted on 2014-10-02 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This different view shows the inarticulate a bit better. see previous entry for sizes.

Photo title: Another view.

Taxa present: Paraspirifer bownockeri

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Submitted on 2014-10-02 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This Megistocrinus shows some wear and tear with a number of nodes damaged. It is 3 cm thick by 5. cm wide.

Photo title: Crinoid calyx

Taxa present: Megistocrinus nodosus

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