Devonian blastoid

Submitted by: David Thompson
Submit date: 2017-04-07
Location (approximate): Alpena, Alpena, MI
Stratigraphy: Thunder Bay Formation
Age: Erian (Middle Devonian)
Submitter notes: Devonian blastoid, Placoblastus obovatus, from Thunder Bay Limestone of Alpena, Blastoid is 4 cm (1.57 inches) long by 2 cm (.78 inches) wide. The matrix is 8 cm (3 inches) long by 4 cm(1.5 inches) wide. US ten cents for scale. Collected March, 2012.

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