Submitted on 2009-08-25 by ummp invertebrate paleontology

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: Close up view of the previous submission.

Photo title: Coral - View #2

Taxa present: Cladopora pulchra

View full record

Submitted on 2009-11-20 by Scott Vergiels

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: A new occurance for a rare coral. It measures 62mm in diameter.

Photo title: Horn Coral

Taxa present: Naos ponderosum

View full record

Submitted on 2013-07-23 by Joseph Koniecki

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: This blastoid is 1.3 cm tall. The side and top view are of the same specimen.

Photo title: Blastoid

Taxa present: Heteroschisma alatus

View full record

Submitted on 2014-07-08 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: This is an infested crinoid stem with multiple small borings of a parasitic worm: Myzostomida. This has 9 borings in this one stem section. Not too much is known about these galls or tumors as they are also called. They are not too common.

Photo title: Parasitic gall on crinoid columnal

Taxa present: Myzostomida

View full record

Submitted on 2014-07-08 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: The Myzostomida are an order of small marine polychaete worms, which are parasitic on crinoids causing gall swelling and holes but rarely leaving any other trace.

Photo title: Parasitic gall on crinoid

Taxa present: Myzostomida

View full record

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

View full record

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

View full record

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

View full record