Submitted on 2008-10-07 by David Clark

Location (approximate): Alpena, Alpena, MI

Strat unit: Genshaw formation

Submitter notes: Fish tooth from the Genshaw formation. This is the second tooth and is located on the back side of the plate

Photo title:

Taxa present: Onychodus sp.

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Submitted on 2008-10-07 by David Clark

Location (approximate): Alpena, Alpena, MI

Strat unit: Genshaw formation

Submitter notes: Fish tooth from the Genshaw formation. A second tooth is located on the back side of the plate

Photo title:

Taxa present: Onychodus sp.

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Submitted on 2008-10-07 by Ken Dobson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes:

Photo title: A different view of brachiopod plate.

Taxa present: Paraspirifer bownockeri

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Submitted on 2008-10-07 by Ken Dobson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: These three Paraspirifer bownockeri brachiopods show Hederella bryozoa on the bottom fossil and Cornulites worm scars, and the holes made by Clionoides, a boring sponge on the upper left example. From the Ken Dobson Collection.

Photo title: A Lovely cluster of Large Silica Brachiopods in matrix with epifauna.

Taxa present: Paraspirifer bownockeri, Hederella , Cornulites , Clionoides

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Submitted on 2008-10-07 by Ken Dobson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This plate shows the extensive 'armor' of these early fish

Photo title: Another Arthrodire fish plate from the Ken Dobson collection

Taxa present: Protitanichthys rockportensis

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Submitted on 2008-10-07 by Ken Dobson

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: This image is of a large plate from the head of a Devonian Fish. The Nuchal plate was at the very back of the top of the head and the notch at the top of the photo would have been the back towards the tail area. U.S. ten cent piece for scale.

Photo title: Large, Nearly Complete, Nuchal plate from Devonian Arthrodire Fish

Taxa present: Protitanicthys rockportensis

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Submitted on 2008-10-07 by Ken Dobson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This example of a complete Dolatocrinus shows all the parts in the round. Two arms are missing but this allows the tegmen to be seen.

Photo title: A beautiful complete crinoid in matrix with stem and arms.

Taxa present: Dolatocrinus liratus

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Submitted on 2008-10-07 by Ken Dobson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: Collected in 1994, Ken had many years to enjoy this wonderful example of Megistocrinus before he died a few years ago. We collected this at Partridge Point in Alpena and the crinoid was completely covered with bryozoans that can still be seen covering the plate. Ken, at the time, was not optimistic about how this would turn out and until it was cleaned by Scott Vergiels, he did not know what a treasure he had.

Photo title: This magnificent complete crinoid was the pride of Ken Dobson's collection

Taxa present: Megistocrinus nodosus

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Submitted on 2008-10-07 by Ken Dobson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This closeup shows the tegmen to advantage

Photo title: Another view of the same Crinoid

Taxa present: Dolatocrinus liratus

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Submitted on 2008-10-07 by Ken Dobson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: The muddy bottom of the Devonian seas over Michigan seemed to have few hard places for animals to attach and therefore almost any hard surface was prime real estate. This inarticulate has attached itself to the larger brachiopod for a safe place but this proved a mistake as they died togather. Some small bryozoan also have grown on both.

Photo title: A Large Brachiopod with a small inarticulate Brachiopod attached.

Taxa present: Orthospirifer cooperi, Petrocrania hamiltonae, Hederella

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Submitted on 2008-10-07 by Ken Dobson

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: This seems to be just a random association between this Platyceras snail and the large brachiopod, Orthospirifer. These are always suspect as the snails are noted to bore into brachiopods to eat their contents as they also did with crinoids.

Photo title: random association of snail and brachiopod

Taxa present: Orthospirifer cooperi, Platyceras bucculentum

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Submitted on 2008-10-07 by David Clark

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: Prepared by Scott Vergiels. Photo by Colin Sumrall. Rare late Devonian cystoid donated to UMMP. Potentially the second known specimen of this species.

Photo title:

Taxa present: Lipsanocystis oblatus

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Submitted on 2008-10-07 by Ken Dobson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This view is photographed on a black background that can show details not seen in natural color.

Photo title: Another view to show detail of the whole crinoid

Taxa present: Megistocrinus nodosus

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Submitted on 2008-10-07 by Ken Dobson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: Also the extent and variety of bryozoa is clear on the plate.

Photo title: This shows the detail of the stem with the cirri and the base of another incomplete Megistocrinus

Taxa present: Megistocrinus nodosus

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Submitted on 2008-10-07 by Ken Dobson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes:

Photo title: Detail of arms and crown

Taxa present: Megistocrinus nodosus

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Submitted on 2008-10-07 by Ken Dobson

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This shows the anal sac or tube.

Photo title: Another view of the same Crinoid

Taxa present: Decorocrinus arkonensis

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Submitted on 2008-10-07 by Ken Dobson

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Here is a different specimen from Ken's collection that show the complete crown, arms, stem and anal sac extended.

Photo title: A complete crown with stem and anal sac

Taxa present: Decorocrinus arkonensis

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Submitted on 2008-10-07 by Ken Dobson

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Although this is not a complete crinoid crown, enough of the caalyx and anal tube or sac can identify the species.

Photo title: A closer view of Decorocrinus

Taxa present: Decorocrinus arkonensis

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Submitted on 2008-10-07 by Ken Dobson

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes:

Photo title: A closer view of Corocrinus

Taxa present: Corocrinus calypso

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Submitted on 2008-10-07 by Ken Dobson

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This small plate shows two species of crinoid from one location.

Photo title: A plate with two different species of crinoid from Arkona, Ontario

Taxa present: Corocrinus calypso, Decorocrinus arkonensis

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