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: None

Photo title: Brachiopod

Taxa present: Paraspirifer bownockeri

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Submitted on 2021-09-22 by Mary Ann Szwabowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: None

Photo title: Crinoid Calyx

Taxa present: Arthroacantha carpenteri

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Submitted on 2021-09-22 by Mary Ann Szwabowski

Location (approximate): Alpena, Alpena, MI

Strat unit: Partridge Point formation

Submitter notes: None

Photo title: Blastoids

Taxa present: Hyperoblastus , Hetroschisma , Nucleocrinus

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Submitted on 2021-09-22 by Mary Ann Szwabowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Dundee formation

Submitter notes: None

Photo title: Brachiopods

Taxa present: Brachiopoda

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Submitted on 2021-09-22 by Mary Ann Szwabowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: None

Photo title:

Taxa present: Protitanichthys

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Submitted on 2021-09-22 by Mary Ann Szwabowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: None

Photo title: Brachiopod with Bryozoan

Taxa present: Strophodonta demissa, Fistulipora

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Submitted on 2021-09-22 by Mary Ann Szwabowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: Bryozoan has left this small gastropod unidentifiable

Photo title: Gastropod with Bryozoan

Taxa present: Fistulipora , Platyceras

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Submitted on 2021-09-22 by Mary Ann Szwabowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This is a mature pyritized brachipod

Photo title: Pyritized Brachiopod with Inarticulate Bracjipods

Taxa present: Mucrospirifer , Devonochonetes , Chonetes , Paraspirifer bownockeri, Cornulites

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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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Submitted on 2021-09-22 by Mary Ann Szwabowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: Brachiopod encrusted with bryozoan

Photo title: Brachiopod with Bryozoan

Taxa present: Fistulipora , Mediospirifer audaculus

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Submitted on 2021-08-16 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This complete pyritized calyx shows the dramatic arm branching bifurcating again and again.

Photo title: Pyritized Crinoid Calyx

Taxa present:

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Submitted on 2021-08-16 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This plate from the Silica shale was collected long ago, but I have not been able to get anyone with skills needed to prepare it until now. It shows a complete Arthroacantha carpenteri crinoid crown with arms, caylx and stem plus a distinctive Bryozoan colony related to the Silica Fm., Sulcoreteporra deissi (Mc Nair 1937) Size of plate 9" or 23 cm wide by 8 1/2" or 21 cm. Weighs 8 .5 lbs.

Photo title: Silica Fossil plate

Taxa present: Arthroacantha carpenteri, Sulcoretepora deissi

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Submitted on 2021-08-16 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This entire plate was expertly prepared by J. Koniecki who is familiar with the Silica and took special care to reveal this Bryozoan colony on the plate.

Photo title: Detail of Bryozoan colony

Taxa present:

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Submitted on 2021-08-16 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: Here is closer view of the crown showing charactoristic branching of arms and detail of stem column

Photo title: Detail of crinoid crown

Taxa present: Arthroacantha carpenteri

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Submitted on 2021-08-09 by Mary Ann Szwabowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: None

Photo title: Brachiopod with Bryozoan

Taxa present: Pseudoatrypa , Fistulipora

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