Submitted on 2019-09-05 by Nick Katsarelas

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: I had just started collecting in earnest that summer of 2017, and this specimen was lying all by itself on the Partridge Point shoreline. It is 4.75 cm long.

Photo title: Placoblastus obovatus

Taxa present: Placoblastus obovatus

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Submitted on 2019-07-21 by Nick Katsarelas

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: This is the largest (partial) trilobite I ever found. It's approximately 4 cm across the cephalon. It was beautifully prepped by Joseph Koniecki.

Photo title:

Taxa present: Eldredgeops rana crassituberculata

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Submitted on 2019-08-21 by Nick Katsarelas

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: I retrieved this specimen from a construction site on Bagley Road in 2018. The site is now a credit union. Specimen is approximately 70 mm x 90 mm.

Photo title: Spongophyllum alpenense

Taxa present: Spongophyllum alpenense

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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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