Submitted on 2014-10-08 by Ken Dobson

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This collection of small pyritized fossils includes a brachiopod, a crinoid calyx, and two cephalopods, one straight and the other coiled. All but the brachiopod are from Arkona, Ontario. The Brach is from Milan, Michigan.

Photo title: A collection of small pyritized fossils from the Ken Dobson collection

Taxa present: Tornoceras , unidentified cephalopod , Arthroacantha carpentari, Rhipidomella penelope

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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. 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 Ken Dobson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This large Placoblastus blastoid is in matrix and slightly crushed.

Photo title: Large Devonian blastoid from Alpena, MI

Taxa present: Placoblastus obovatus

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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 shows two additional blastoids free of matrix but weathered somewhat.

Photo title: Two additional blastoids from Alpena, MI

Taxa present: Placoblastus obovatus

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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): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: These Bactrities are common in the Arkona shale but rarely are they this complete due to the extremely soft shale. This is very delicate and a few more rain drops would have destroyed this association.

Photo title: Small pyritized cephalopod from Arkona, Ontario from the Ken Dobson collection

Taxa present: Bactrites arkonensis

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Submitted on 2008-10-07 by Ken Dobson

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes:

Photo title: A closer view of Bactrities

Taxa present: Bactrites arkonensis

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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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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: 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: 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: 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 2008-10-06 by Ken Dobson

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: This shows more detail of the nice Phacops/Eldredgops from Milan in Ken's collection

Photo title: A Closeup view of the Trilobite in previous photo

Taxa present: Phacops rana crassituberculata

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Submitted on 2008-10-06 by Ken Dobson

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: As noted by Scott Vergiels in his photo in this archive, most fossils are flattened somewhat by being buried and uncompressed examples are are unusual.

Photo title: A nice uncompressed example of the favorite Silica Trilobite, Phacops crassituberculata

Taxa present: Phacops crassituberculata

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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): 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: 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 2008-10-22 by ummp invertebrate paleontology

Location (approximate): , Presque Isle, MI

Strat unit: Rogers City formation

Submitter notes: This specimen is about 3 cm across.

Photo title: Pelecypod - View #2

Taxa present: Nuculoides sp.

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