Submitted on 2020-01-08 by Mike Palescuk

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: Note encrusting bryozoan on the pedicle valve. Specimen measures 1.5" (37mm) long.

Photo title: Lampshell brachiopod

Taxa present: Cranaena lincklaeni

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Submitted on 2021-02-17 by Mary Ann Szwabowski

Location (approximate): Alpena, Alpena, MI

Strat unit: Partridge Point formation

Submitter notes: None

Photo title: Blastoid

Taxa present: Placoblastus obovatus

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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 2021-02-20 by Mary Ann Szwabowski

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: None

Photo title: Crinoid

Taxa present: Megistocrinus multidecoratus

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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 2021-02-20 by Mary Ann Szwabowski

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: None

Photo title: Crinoid Calyx

Taxa present: Megistocrinus concavus

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Submitted on 2021-06-24 by Joseph Koniecki

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: None

Photo title: Crinoid calyx

Taxa present: Dolatocrinus barrisi

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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 2025-11-05 by Joseph Koniecki

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: None

Photo title: Coral and Blastoids

Taxa present: Heliophyllum halli, Heteroschisma subtrunctatum

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