Submitted on 2018-12-25 by Joseph Koniecki

Location (approximate): Paulding, Paulding, OH

Strat unit: Silica formation

Submitter notes: The top crinoid is about 3 cm tall. Crinoids are very rare at the Paulding site compared to the Sylvania site. Very few complete crowns have been found.

Photo title: Crinoid

Taxa present: Proctothylacocrinus sp.

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Submitted on 2018-12-15 by Joseph Koniecki

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: The specimen is 1.5 cm across.

Photo title: Pelecypod

Taxa present: Paracyclas lirata

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Submitted on 2018-12-15 by Joseph Koniecki

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: Specimen is about 3 cm across. It is rare to find these inflated.

Photo title: Pelecypod

Taxa present: Mytilarca cordata

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Submitted on 2018-12-13 by Joseph Koniecki

Location (approximate): Alpena, Alpena, MI

Strat unit: Four Mile Dam formation

Submitter notes: Identification of this specimen is based on a 1876 publication by Rominger. The coral is 10.5 cm tall.

Photo title: Coral

Taxa present: Striatopora rugosa

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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: 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 2018-06-09 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 2018-03-13 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: 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 2017-09-04 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 2017-04-07 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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