Submitted on 2018-07-06 by Joseph Koniecki

Location (approximate): Sylvania, Lucas, OH

Strat unit: Dundee formation

Submitter notes: 4 cm across the matrix.

Photo title: Rostroconch

Taxa present: Hippocardia sp.

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Submitted on 2018-06-12 by Michael Lask

Location (approximate): Port Sanilac, Sanilac, MI

Strat unit: Amherstburg formation

Submitter notes: These little pieces of Petoskey stone were collected decades ago on the rocky shores of Lake Huron. They are exactly as found, naturally polished and aged. The larger fragment is 36 mm across. Hexagonaria was a genus of reef forming tabulate coral. Tabulate corals are extinct. Enormous reefs formed in what was Michigan during the Devonian period.

Photo title:

Taxa present: Hexagonaria percarinata

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Submitted on 2018-06-09 by Joseph Koniecki

Location (approximate): Paulding, Paulding, OH

Strat unit: Silica formation

Submitter notes: The slab is 30 cm across.

Photo title: Corals, bryzoans, and brachs, OH My

Taxa present: Heterophrentis simplex, Sulcoretepora sp., Strophodonta sp., Aulopora microbuccinata

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Submitted on 2018-06-09 by Joseph Koniecki

Location (approximate): Paulding, Paulding, OH

Strat unit: Silica formation

Submitter notes: It is 24 cm across the slab.

Photo title: Corals

Taxa present: Heterophrentis simplex

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Submitted on 2018-06-09 by Joseph Koniecki

Location (approximate): Paulding, Paulding, OH

Strat unit: Silica formation

Submitter notes: The crinoid is 2.5 cm tall. Another very rare crinoid.

Photo title: Crinoid

Taxa present: Melocrinus

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Submitted on 2018-06-09 by Joseph Koniecki

Location (approximate): Paulding, Paulding, OH

Strat unit: Silica formation

Submitter notes: A plate with four crinoid clayxes. It is 16 cm across the slab.

Photo title: Crinoids

Taxa present: Gilbertsocrinus ohioensis

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Submitted on 2018-06-09 by Joseph Koniecki

Location (approximate): Paulding, Paulding, OH

Strat unit: Silica formation

Submitter notes: A very rare crinoid. The calyx is 1 cm across.

Photo title: Crinoid

Taxa present: Deltacrinus sp.

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Submitted on 2018-03-13 by Joseph Koniecki

Location (approximate): Alpena, Alpena, MI

Strat unit: Norway Point formation

Submitter notes: The brachiopod is 2.7 cm across.

Photo title: Brachiopod

Taxa present: Spinocyrtia clintoni

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Submitted on 2018-03-13 by Joseph Koniecki

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This crinoid is 1.1 cm tall.

Photo title: Crinoid calyx

Taxa present: Atractocrinus concinnus

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Submitted on 2018-03-06 by Joseph Koniecki

Location (approximate): Paulding, Paulding, OH

Strat unit: Silica formation

Submitter notes: This specimen is 5.7 cm across.

Photo title: Pelecypod

Taxa present: Mytilarca cordata

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Submitted on 2017-09-04 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: Side view of Placoblastus showing ambulacrum and detail of plate structure.

Photo title: Side view of ambulacrum

Taxa present:

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Submitted on 2017-09-04 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: Detail of basals and stem attachment.

Photo title: Basal view

Taxa present:

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Submitted on 2017-09-04 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This is a straight comparison of size with my smallest sample and the largest

Photo title: The Little and the big.

Taxa present:

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Submitted on 2017-04-07 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

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.

Photo title: Devonian blastoid

Taxa present:

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Submitted on 2017-04-07 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Partridge Point formation

Submitter notes: This is a very small Placoblastus obovatus at just 17.3 mm long and 8.8 mm wide. The average is about 3.5 cm but they can be very much larger! When small these can be confused with the Neucleocrinus melonformis from the same formations

Photo title: Baby Placoblastus

Taxa present:

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Submitted on 2016-06-08 by David Thompson

Location (approximate): Paulding, Paulding, OH

Strat unit: Dundee formation

Submitter notes: Collected at Paulding and prepped by Scott Vergiels.

Photo title: Dundee Limestone Rostroconch

Taxa present:

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Submitted on 2016-06-08 by David Thompson

Location (approximate): Paulding, Paulding, OH

Strat unit: Dundee formation

Submitter notes: This specimen shows an injury to the Rostroconch early in life and it survived to continue growing.

Photo title: Damaged Rostroconch.

Taxa present:

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Submitted on 2016-02-08 by Joseph Koniecki

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: These corals are not attached at the bottom. It appears that they may have grown up along side of each other and been buried together. The corals are about 10-12 cm in height.

Photo title: Group of Corals

Taxa present: Aulacophyllum hemicrassatum

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Submitted on 2015-12-24 by Mike Palescuk

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Decorocrinus arkonensis (McIntosh 2001), formerly Botryocrinus. Found in 1976. 65 pieces painstakingly re-assembled into this 2-7/8" long

Photo title: Crinoid

Taxa present: Decorocrinus arkonensis

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Submitted on 2015-12-20 by Michael Lask

Location (approximate): Alpena, Alpena, MI

Strat unit: Squaw Bay formation

Submitter notes: 29 mm across. Collected by Patricia Rutkowski. Prepared by Scott Vergiels.

Photo title:

Taxa present: Koenenites cooperi

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