Submitted on 2025-06-07 by Mary Ann Szwabowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This speciman is a crusher tooth plate

Photo title: Fish Tooth

Taxa present: ptyctodont

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Submitted on 2025-05-30 by Mary Ann Szwabowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: None

Photo title: Mucrospirifer encrusted with Bryozoan

Taxa present: Mucrospirifer prolificus, Fistulipora

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Submitted on 2025-05-30 by Mary Ann Szwabowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: The pyritized lophophore is exposed

Photo title: Pyritized Paraspirifer Lophophore

Taxa present: Paraspirifer bownockeri

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Submitted on 2025-05-30 by Mary Ann Szwabowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Dundee formation

Submitter notes: None

Photo title: Rostroconch

Taxa present: Conocardium cuneas

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Submitted on 2024-09-07 by Mary Ann Szwabowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This solitary coral is encrusted with bryozoan

Photo title: Solitary Coral

Taxa present: Fistulipora , Heliophyllum halli

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Submitted on 2024-09-07 by Mary Ann Szwabowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: Perfectly enrolled trilobite

Photo title: Trilobite

Taxa present: Eldredgeops crassituberculata

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Submitted on 2024-09-07 by Mary Ann Szwabowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This brachiopod is encrusted with bryozoan

Photo title: Brachiopod with Bryozoan

Taxa present: Fistulipora , Pseudoatrypa

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Submitted on 2024-03-20 by Mary Ann Szwabowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: Speciman measure about 6.0 cm

Photo title: Trilobite - Eldredgeops milleri

Taxa present: Eldredgeops milleri

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Submitted on 2024-03-20 by Mary Ann Szwabowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This brachiopod is encrusted with a peacock colored pyrite and measures 5.0 cm.

Photo title: Pyritized Brachiopod

Taxa present: Paraspirifer bownockeri

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Submitted on 2024-02-11 by Michael Lask

Location (approximate): Paulding, Paulding, OH

Strat unit: Silica formation

Submitter notes: 55 mm

Photo title: Eldredgeops crassituberculata

Taxa present: Eldredgeops crassituberculata

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Submitted on 2024-02-11 by Michael Lask

Location (approximate): Alpena, Alpena, MI

Strat unit: Squaw Bay formation

Submitter notes: 29 mm across. Collected by Patricia Rutkowski. Prepared by Scott Vergiels.

Photo title:

Taxa present: Koenenites cooperi

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Submitted on 2024-02-11 by Michael Lask

Location (approximate): Alpena, Alpena, MI

Strat unit: Squaw Bay formation

Submitter notes: The larger one is 34 mm across. Collected by Patricia Rutkowski. Prepared by Scott Vergiels.

Photo title:

Taxa present: Koenenites cooperi

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Submitted on 2024-02-11 by Michael Lask

Location (approximate): Alpena, Alpena, MI

Strat unit: Paxton formation

Submitter notes: Dunkleosteus sp., Antrim Shale, Traverse Group, Paxton Quarry, Alpena, Michigan (Devonian) - 326 mm long (over a foot!) This is a section of the left, lower inferognathal element (part of the lower jaw). Collected and prepared by Patricia Rutkowski. She recovered part of it in 1994 and another part in 1998.

Photo title:

Taxa present: Dunkleosteus sp.

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Submitted on 2024-01-12 by Mary Ann Szwabowski

Location (approximate): Napoleon, Jackson, MI

Strat unit: Marshall formation

Submitter notes: This specimen from the lower Marshall Formation is a crusher tooth belonging to the Chondrichthyans class of fish and measures 12.7mm long

Photo title: Shark Tooth

Taxa present: Deltodus

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Submitted on 2024-01-10 by Mary Ann Szwabowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This trilobite has two pyritized muscle scars from the soft bodied stomach underneath.

Photo title: Trilobite

Taxa present: Eldredgeops crassituberculata

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Submitted on 2023-12-03 by Mary Ann Szwabowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: Specimen measures about 6-1/2" x 3-1/2". The shell that remains has been preserved with spirorbis (worms) on the outside of the shell and Repteria stolonifera (bryozoan) on the underside.

Photo title: Nephriticeras Cephalopod

Taxa present: Nephriticeras

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Submitted on 2022-08-24 by Mary Ann Szwabowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: The muscles of this brachiopod are normally relaxed (closed) at death, but in this speciman the muscles were open.

Photo title: Paraspirifer with open muscle

Taxa present: Paraspirifer bownockeri

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Submitted on 2022-02-13 by Nick Katsarelas

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: I'd welcome your help in identifying the genus or species to which these belong. Each plate is between 5 and 10mm in diameter.

Photo title: Crinoid basal plates

Taxa present: Crinoidea

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Submitted on 2022-02-13 by Nick Katsarelas

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: I'd welcome your help in identifying the genus or species to which these belong.

Photo title: Crinoid spines

Taxa present: Crinoidea

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Submitted on 2021-09-22 by Mary Ann Szwabowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: Brachiopod with worm tubes

Photo title: Brachiopod with Worm Tubes

Taxa present: Cornulites , Paraspirifer bownockeri

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