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Thunder Bay formation |
David Thompson |
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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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Thunder Bay formation |
David Thompson |
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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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Thunder Bay formation |
David Thompson |
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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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Partridge Point formation |
David Thompson |
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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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Thunder Bay formation |
David Thompson |
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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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Dundee formation |
David Thompson |
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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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Dundee formation |
David Thompson |
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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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Aulacophyllum hemicrassatum |
Thunder Bay formation |
Joseph Koniecki |
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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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Decorocrinus arkonensis |
Arkona formation |
Mike Palescuk |
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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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Koenenites cooperi |
Squaw Bay formation |
Michael Lask |
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Submitted on 2015-12-20 by Michael Lask
Location (approximate): Alpena, Alpena, MI
Strat unit: Squaw Bay formation
Submitter notes: Koenenites cooperi (the largest is 63 mm across) and Bactrite warthini (54 mm long), Squaw Bay, Alpena, Michigan (Devonian).
Collected and prepared by Patricia Rutkowski.
Photo title:
Taxa present: Koenenites cooperi
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Koenenites cooperi |
Squaw Bay formation |
Michael Lask |
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Submitted on 2015-12-20 by Michael Lask
Location (approximate): Alpena, Alpena, MI
Strat unit: Squaw Bay formation
Submitter notes: The larger one is 34 mm across.
Collected by Patricia Rutkowski. Prepared by Scott Vergiels.
Photo title:
Taxa present: Koenenites cooperi
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Koenenites cooperi |
Squaw Bay formation |
Michael Lask |
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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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Hippocardia cunea |
Ohio formation |
Michael Lask |
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Submitted on 2015-12-20 by Michael Lask
Location (approximate): Berkey, Lucas, OH
Strat unit: Ohio formation
Submitter notes: Dundee Limestone, Sylvania, Ohio (Devonian) - 40 mm.
Rostroconchs are an extinct class of molluscs.
Photo title:
Taxa present: Hippocardia cunea
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Strataster devonicus |
Silica formation |
Michael Lask |
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Submitted on 2015-12-20 by Michael Lask
Location (approximate): Berkey, Lucas, OH
Strat unit: Silica formation
Submitter notes: 24 mm across.
Collected and prepared by Patricia Rutkowski.
Photo title:
Taxa present: Strataster devonicus
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Eldredgeops milleri |
Silica formation |
Michael Lask |
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Submitted on 2015-12-20 by Michael Lask
Location (approximate): Berkey, Lucas, OH
Strat unit: Silica formation
Submitter notes: 43 mm long.
Collected and prepared by Patricia Rutkowski.
Photo title: Trilobite
Taxa present: Eldredgeops milleri
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Tornoceras uniangulare |
Squaw Bay formation |
Michael Lask |
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Submitted on 2015-12-20 by Michael Lask
Location (approximate): Alpena, Alpena, MI
Strat unit: Squaw Bay formation
Submitter notes: 43 mm across.
Collected by Patricia Rutkowski. Prepared by Scott Vergiels.
Photo title:
Taxa present: Tornoceras uniangulare
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Michelinoceras sp. |
Squaw Bay formation |
Michael Lask |
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Submitted on 2015-12-20 by Michael Lask
Location (approximate): Alpena, Alpena, MI
Strat unit: Squaw Bay formation
Submitter notes: 44 mm.
Collected by Patricia Rutkowski.
Photo title:
Taxa present: Michelinoceras sp.
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Bactrite warthini |
Squaw Bay formation |
Michael Lask |
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Submitted on 2015-12-20 by Michael Lask
Location (approximate): Alpena, Alpena, MI
Strat unit: Squaw Bay formation
Submitter notes: 44 mm.
Collected and prepared by Patricia Rutkowski.
Photo title:
Taxa present: Bactrite warthini
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Hexagonaria percarinatum |
Amherstburg formation |
Michael Lask |
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Submitted on 2015-12-20 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 percarinatum
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Platyceras rarispinum |
Silica formation |
Michael Lask |
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Submitted on 2015-12-20 by Michael Lask
Location (approximate): Milan, Washtenaw, MI
Strat unit: Silica formation
Submitter notes: 41 mm across.
This snail would have been covered in long spines in life. Only the base of the spines are preserved in this specimen. Occasionally the spines are preserved and revealed with very careful preparation.
Photo title:
Taxa present: Platyceras rarispinum
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