Submitted on 2007-02-20 by David Thompson

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: This Platyceras has an inarticulate Brachiopod, Philhedra crenistriata, living on it. In the Devonian seas, if you were solid, someone started living on you quickly. This inarticulate has clear lines radiating from the center as a diagnostic feature and this shows clearly in this picture.

Photo title: Snail with inarticulate brachiopod

Taxa present: Platyceras bucculentum, Philhedra crenistriata

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Submitted on 2007-02-19 by David Thompson

Location (approximate): Paulding, Paulding, OH

Strat unit: Silica formation

Submitter notes: The Phyllocarids were large shrimp-like crustaceans with four species identified in the Silica Formation. These mandibles are often found with nothing else to identify the species. This is a complete set from one side of the animal. 10 cent piece for scale.

Photo title: Phyllocarid 'jaw'

Taxa present: Phyllocarid mandible

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Submitted on 2007-02-19 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This Cystoid shows a considerable tail portion in addition to the body of this cystoid. The background is finely broken Bryzoan fronds. This is from the Thunder Bay Limestone near Partridge Point, Alpena. The U.S. 10 cent pc. is for scale. The body is 2 cm long with the additional tail just about 3 cm.

Photo title: Devonian Cystoid

Taxa present: Lipsanocystis traversensis

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Submitted on 2007-02-18 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Certainly one of the most attractive crinoids of the formation. Very Rare! It was described by Winifred Goldring on a specimen that had regenerated arms.

Photo title: Crinoid Crown

Taxa present: Gennaeocrinus mourantae

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Submitted on 2007-02-18 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: The preservation of blastoids in the formation is exceptional. Clusters are very rare! This group of five larger specimens is indeed a find. The blastoids range in size from 10 - 13mm in height.

Photo title: Blastoid Cluster

Taxa present: Hyperoblastus filosa

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Submitted on 2007-02-18 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Corocrinus is the second most common crinoid in the formation behind Arthroacantha. It's distinctive ornamentation and three notches on the basals are characteristic of the crinoid. However, it's placement needs revision. The specimen is 22mm high and 15mm wide

Photo title: Crinoid Calyx

Taxa present: Corocrinus(?) calypso

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Submitted on 2007-02-18 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Corocrinus is the second most common crinoid in the formation next to Arthroacantha. This specimen shows the arm structure. The plates of the calyx are difficult to see because of pyrite. The crown measures 45mm high and 55mm wide.

Photo title: Crinoid Crown

Taxa present: Corocrinus(?) calypso

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Submitted on 2007-02-18 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: Phacops iowensis southworthi eyes always contain 13 dorsoventral files and is only known from the Hungry Hollow member of the Widder formation where it is very rare. (The holotype is only a cephalon) The species of P. iowensis and E. rana co-exist in only a few Hamilton formations. This cephalon of P. iowensis southworthi is preserved a few millimeters atop a nearly complete specimen of E. rana rana. The cephalon measures 35mm wide and 23mm high. The E. Rana rana measures 35mm long

Photo title: Trilobite Association

Taxa present: Phacops (Eldredgeops?) iowensis southworthi, Eldredgeops (Phacops) rana rana

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Submitted on 2007-02-18 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: H. juvene is much smaller in size and not as common as Heliophyllum halli halli in the Hungry Hollow member. The largest of the three specimens in the photo is 40mm long and 15mm in diameter. The smallest is about 15mm long and wide.

Photo title: Horn Corals

Taxa present: Heliophyllum juvene

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Submitted on 2007-02-18 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This tabulate coral is restricted to the upper part of the formation. The largest of the five specimens shown is 40mm high by 30mm wide. The smallest is 25mm by 25mm.

Photo title: Tabulate Coral

Taxa present: Aulocystis ramosa

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Submitted on 2007-02-18 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: These tabulate corals are commonly attached to crinoid stems which probably enabled them to stay above the sea floor to improve their chances for food. These specimens are approximately 25mm in diameter.

Photo title: Tabulate Coral

Taxa present: Antholites speciosus

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Submitted on 2007-02-18 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: These somewhat common corals, like Antholites, are found attached to crinoid stems. Favorite hosts are the crinoids' Dolatocrinus and Megistocrinus. On some specimens, Cladochonus deforms the stem of it's host. It is not known how destructive this may have been, if at all, to the life of the crinoid host. The largest of the three pictured specimens is 30 X 40mm. The smallest colony is 22mm in diameter.

Photo title: Tabulate Corals

Taxa present: Cladochonus antiquus

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Submitted on 2007-02-18 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Top row: Contrasts a very large specimen (20mm) with a very small one (6mm) and 2 average size (12mm) specimens showing top and bottom views. Middle row: First specimen has turned-up margin; the second shows rejuvenation; the third is twins (two growing together); The fourth is encrusted with the Bryozoan, Eliasopora. The fifth is encrusted with Aulopora. Third row: Shows various attachments; #'s 1&2 are attached to trilobite fragments. #3 is attached to a tiny chonetid brachiopod. #4 is attached to a small crinoid columnal, and #5 is attached to a Pelecypod fragment.

Photo title: Button Corals

Taxa present: Microcyclus thedfordensis, Eliasopora stellatum, Aulopora sp., Eldredgeops sp.

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Submitted on 2007-02-18 by Mike Topor

Location (approximate): Thedford, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Occurs high in the Arkona formation in the same horizon as the button coral Microcyclus, but not as numerous. Because of it's shape it's often called the 'slipper coral'. The largest of the six specimens measures 13mm long and nearly as wide.

Photo title: Coral

Taxa present: Xenocyathellus thedfordensis

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Submitted on 2007-02-18 by Joseph Koniecki

Location (approximate): Alpena, Alpena, MI

Strat unit: Squaw Bay formation

Submitter notes:

Photo title: Ammonites

Taxa present: Koenenites cooperi

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Submitted on 2007-02-17 by David Thompson

Location (approximate): Thedford, Lambton, ON

Strat unit: Widder formation

Submitter notes: This fully inflated Devonian Blastoid, Heteroschisma canadense, was found in this matrix with fragmants of bryzoan fronds, crinoid stems & corals pieces too small to identify. A U.S. 10 Cent piece for scale. In older literature, this is often called by the name,'Codaster'

Photo title: Another Hungry Hollow Blastoid

Taxa present: Heteroschisma canadense

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Submitted on 2007-02-17 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This Silica Crinoid, Gilbertsocrinus ohioensis, is beautifully displayed as a whole speciman elsewhere on this site. This example is a side view of the caylx with stem and showing the spine at the bottom in place while a small Platyceras is attached at the top right. Given the large spines on this crinoid, the Platyceras had to get on top some way other then crawling up the sides!

Photo title: Crinoid-Blastoid combination

Taxa present: Gilbertsocrinus ohioensis, Platyceras

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Submitted on 2007-02-17 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This view of the previous speciman shows the Platyceras more completely and another large spine at the bottom of the caylx. The Silica preservation has more pyrite in the fossils often making them rather 'brassy' looking.

Photo title: Another view of crinoid-platyceras

Taxa present: Gilbertsocrinus ohioensis, Platyceras

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Submitted on 2007-02-17 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: This is a nice large example of the Devonian Blastoid, Heteroschisma alatum, oral view with fingers for scale. As I was stepping across a ditch, this was directly in front of the toe of my boot, I called my companions to see it before I tried to pick this up as it was large & easily seen. I hoped it was & it did prove to be complete.

Photo title: Devonian Blastoid

Taxa present: Heteroschisma alatum

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Submitted on 2007-02-17 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: This is a view showing the ornamentation in the interambulacral area of this blastoid that is charactoristic for species identification.

Photo title: side view of blastoid

Taxa present: Heteroschisma alatum

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