Submitted on 2008-03-12 by Stan Hyne

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: A very nice colony measuring 100mm x 71mm. Commonly known as Petosky stone.

Photo title: Colonial Coral

Taxa present: Spongophyllum alpenense

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Submitted on 2008-03-12 by Pat Rutkowski

Location (approximate): Alpena, Alpena, MI

Strat unit: Alpena formation

Submitter notes: This crown measures 38mm high with about 30mm of stem. The slab is 52mm x 46mm.

Photo title: Crinoid Crown

Taxa present: Decadocrinus sp.

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Submitted on 2008-03-12 by Pat Rutkowski

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: A rare small crown measuring 49mm high and 7mm wide. The slab measures 55m x 37mm.

Photo title: Crinoid Crown

Taxa present: Synbathocrinus matutinus

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Submitted on 2008-03-12 by Pat Rutkowski

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: A rare crinoid crown measuring 63mm high and 10mm wide. The slab measures 105m x 44mm.

Photo title: Crinoid Crown

Taxa present: Synbathocrinus matutinus

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Submitted on 2008-03-12 by Pat Rutkowski

Location (approximate): Alpena, Alpena, MI

Strat unit: Alpena formation

Submitter notes: A beautiful slab with two different crinoid genera and an unidentified coral. The slab measures 115mm x 117mm.

Photo title: Crinoid Crowns

Taxa present: Cadiscocrinus sp., Euryocrinus sp.

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Submitted on 2008-03-12 by Stan Hyne

Location (approximate): Paulding, Paulding, OH

Strat unit: Silica formation

Submitter notes: A very large extended trilobite measuring 80mm long x 52mm wide.

Photo title: Trilobite

Taxa present: Phacops crassituberculata

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Submitted on 2008-03-12 by Pat Rutkowski

Location (approximate): Petoskey, Emmet, MI

Strat unit: Traverse formation

Submitter notes: A large nautiloid cephalopod From the Gravel Point formation measuring 77mm long, 68mm at the widest and 45mm thick.

Photo title: Nautiloid Cephalopod with Encrusting Bryozoan

Taxa present: Michelanoceras pustulosum, Reptaria sp.

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Submitted on 2008-03-12 by Pat Rutkowski

Location (approximate): , Presque Isle, MI

Strat unit: Rogers City formation

Submitter notes: A large unusual gastropod measuring 69mm x 87mm.

Photo title: Gastropod

Taxa present: Pleuronotus decewi

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Submitted on 2008-03-12 by Stan Hyne

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: A nice specimen measuring 34mm long x 23mm wide.

Photo title: Trilobite

Taxa present: Basidechenella rowi arkonensis

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Submitted on 2008-03-12 by Stan Hyne

Location (approximate): Arkona, Lambton, ON

Strat unit: Widder formation

Submitter notes: A nice trilobite measuring 33mm x 20mm.

Photo title: Trilobite

Taxa present: Greenops widderensis

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Submitted on 2008-03-02 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: This tabulate coral is encrusting the underside of a Favosites colony. This coral is rare in the formation. The Favosites measures 68mm X 57mm. Each coral chain link is approximately 10mm in length.

Photo title: Coral on Coral

Taxa present: Aulopora tubaeformis, Favosites placenta

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Submitted on 2008-03-02 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Finding whole colonies of this bryozoan is a rare occurrence in the Arkona Formation. This branching specimen required some reassembly after cleaning. The colony measures 73mm tall by 57mm wide.

Photo title: Bryozoan

Taxa present: Leptotrypella quadrangularis

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Submitted on 2008-03-02 by John Topor

Location (approximate): Thedford, Lambton, ON

Strat unit: Arkona formation

Submitter notes: A close-up view of The Bryozoan Reptaria.

Photo title: Encrusting Bryozoan

Taxa present: Reptaria stolonifera

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Submitted on 2008-03-02 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: A common brachiopod from the Hungry Hollow member of the Widder fm. The outer surface resembles a thumbnail. Top Row: pedicle valve views. Middle Row: Brachial view of a complete specimen. Bottom Row Left: Pedicle valve showing muscle scars. Bottom Row Right: Brachial valve showing muscle scars. These specimens range from 17-21mm wide and 5-7mm in height.

Photo title: Brachiopod

Taxa present: Pholidostrophia nacrea

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Submitted on 2008-03-02 by John Topor

Location (approximate): Thedford, Lambton, ON

Strat unit: Widder formation

Submitter notes: This very inflated prone trilobite measures 32mm in length and 20mm wide. This choice specimen from the upper Widder units shows very little compression. Nearly all trilobites are preserved with various degrees of compression.

Photo title: Trilobite

Taxa present: Eldredgeops rana rana

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Submitted on 2008-03-02 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: Like the genus Dolatocrinus, Megistocrinus has great plate ornamentation variability which can make classification to the species level difficult. There are probably only 2 or 3 species in the Hungry Hollow member. Loose plates of Megistocrinus are common in the formation and even partial specimens should be collected due to the rarity of whole calyxes. This specimen is 29mm in diameter and 19mm high. This photo is of the tegmen(top)view.

Photo title: Crinoid Calyx

Taxa present: Megistocrinus depressus

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Submitted on 2008-03-02 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: This solitary coral is common in the formation. These two specimens are choice examples. The coral on the left is 38mm in diameter. The one on the right is 68mm long and 36mm in diameter.

Photo title: Horn Coral

Taxa present: Cystiphylloides americanum

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Submitted on 2008-03-02 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Two views of a pyritized clam from the Arkona Formation’s pyrite zone. They are approximately 13mm long and 9mm wide.

Photo title: Pelecypod

Taxa present: Nucula lirata

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Submitted on 2008-03-02 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: A somewhat common clam in certain horizons but rarer throughout the rest of the formation. They are often attached to hard crinoidal pieces. The large specimen is 30mm X 27mm. The smaller measures 25mm X 23mm.

Photo title: Pelecypod

Taxa present: Leiopteria ausablensis

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Submitted on 2008-03-02 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: A common, coiled ammonite that occurs in the Arkona Formation. They are pyritic internal molds showing their suture lines. These are large specimens for the Arkona shale with the larger one measuring 17mm and the smaller 15mm in diameter.

Photo title: Ammonite

Taxa present: Tornoceras (T.) arkonense

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