Submitted on 2010-11-26 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Genshaw formation

Submitter notes: An oral view of one of the tiny blastoids collected from the Upper Genshaw of Alpena. The specimen is 5.72 mm tall. These tiny blastoids are in weathered black shales and are very difficult to find in the huge Lafarge Quarry in Alpena. This photo was taken under a stereozoom microscope.

Photo title: Undescribed Heteroschisma blastoid

Taxa present: Heteroschisma sp.

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Submitted on 2010-11-26 by David Thompson

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: This crushed(see next photo entry for crushed side) example is to show what a blastoid in this condition might look like. It is 11.5 mm high by 9.8 mm wide at the widest. This was collected in 1991 from the Martin-Marietta spoil piles in Milan, MI where blastoids are far more rare then, for example, at Paulding, OH.

Photo title: Crushed and Incomplete Example of Hyperoblastus reimani from Milan, MI

Taxa present: Hyperoblastus reimanni

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Submitted on 2010-11-26 by David Thompson

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: This crushed example is to show what a blastoid in this condition might look like. It is 11.5 mm high by 9.8 mm wide at the widest. This was collected in 1991 from the Martin-Marietta spoil piles in Milan, MI where blastoids are far more rare then, for example, at Paulding, OH.

Photo title: Crushed and Incomplete Example of Hyperoblastus reimani from Milan, MI View 2

Taxa present: Hyperoblastus reimanni

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Submitted on 2010-11-26 by David Thompson

Location (approximate): Thedford, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: This is a not too good example of this rare and unusual blastoid. Eleutherocrinus cassedayi from the Hungry Hollow formation at the 'tileyard' at Thedford, Ontario, Canada. The blastoid is 17 mm long and 9 mm wide.Better examples are shown on this website but these are so rare that all examples should be looked at and any partial collected.It is believed that these blastoids were not attached as adults and able to move independently.

Photo title: Eleutherocrinus cassedayi

Taxa present: Eleutherocrinus cassedayi

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Submitted on 2010-11-26 by David Thompson

Location (approximate): Thedford, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: This is a not too good example of this rare and unusual blastoid. Eleutherocrinus cassedayi from the Hungry Hollow formation at the 'tileyard' at Thedford, Ontario, Canada. The blastoid is 17 mm long and 9 mm wide.Better examples are shown on this website but these are so rare that all examples should be looked at and any partial collected.It is believed that these blastoids were not attached as adults and able to move independently.

Photo title: Eleutherocrinus cassedayi view 2

Taxa present: Eleutherocrinus cassedayi

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Submitted on 2010-11-27 by David Thompson

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: A small and rare blastoid from the Hungry Hollow formation of Arkona, Ontario, Canada. This is crushed on one side(see next photo entry) and is 10 mm high by 5.74 mm wide. Identified by Alex Fabian.

Photo title: Devonoblastus whiteavesi

Taxa present: Devonoblastus whiteavesi

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Submitted on 2010-11-27 by David Thompson

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: A small and rare blastoid from the Hungry Hollow formation of Arkona, Ontario, Canada. A view showing the crushed side of the previous photo entry. It is 10 mm high by 5.74 mm wide. Identified by Alex Fabian.

Photo title: Devonoblastus whiteavesi view 2

Taxa present: Devonoblastus whiteavesi

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Submitted on 2011-05-03 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Traverse formation

Submitter notes: Rare crinoid with gastropod attached. Complete calyx with crushed but clear gastropod and the base of several arms. The edge of the gastropod has attached around the small bumps on the crinoid tegmen

Photo title: Pithocrinus cooperi with Platyceras rarispinium

Taxa present: Platyceras rarispinium, Pithocrinus cooperi

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Submitted on 2011-05-03 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Alpena formation

Submitter notes: This view is directly onto the tegmen showing the position of the gastropod and remaining arm bases.

Photo title: Pithocrinus cooperi & gastropod

Taxa present: Pithocrinus cooperi, Platyceras rarispinium

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Submitted on 2011-05-03 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Alpena formation

Submitter notes: This third view shows the unusual plate structure of this crinoid calyx with the gastropod visible on top.

Photo title: Third view of unusual crinoid & gastropod

Taxa present: Pithocrinus cooperi, Platyceras rarispinum

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Submitted on 2011-05-03 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Alpena formation

Submitter notes: This view shows the arms and calyx of this rather rare crinoid. There is a frond of Bryozoan draped over some of the arms which show the flattened tips of the arms

Photo title: Complete crown of unusual crinoid

Taxa present: Aorocrinus cassedayi

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Submitted on 2011-05-03 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Alpena formation

Submitter notes: This view shows the 3-D effect of the multiple arms folding over the top of the crown.

Photo title: View of arms folded over tegmen

Taxa present: Aorocrinus cassedayi

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Submitted on 2011-05-03 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Alpena formation

Submitter notes: This view shows the stem attachment and detail of the calyx ornamentation. The crinoid crown is 2.6 cm high by 2.9 cm at the widest point. The calyx is 1.2 cm thick in this view

Photo title: Third view of crinoid crown

Taxa present: Aorocrinus cassedayi

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Submitted on 2011-05-04 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This is a large and pretty complete crown with stem in matrix. The stem is 2 3/4 inches long (7.5 cm). The whole piece is 8 1/2 inches long (21.5 cm), by 5 inches high (12.5 cm). The calyx is 4.1 cm wide and the longest arm is 3.4 cm long.

Photo title: Crown and stem of large Crinoid

Taxa present: Dolatocrinus stellifer

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Submitted on 2011-05-04 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: Closer view of crinoid.

Photo title: Another view of large crinoid from Thunder Bay Limestone

Taxa present: Dolatocrinus stellifer

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Submitted on 2011-05-04 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This is a closer view of the Calyx of the previous Crinoid. As stated it is about 4.1 cm wide.

Photo title: Detail of Calyx

Taxa present: Dolatocrinus stellifer

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Submitted on 2011-05-04 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: Close up view of arms and pinnules of Dolatocrinus in previous views. The longest of these is 3.4 cm long.

Photo title: Last view of arms and pinnules of crinoid.

Taxa present: Dolatocrinus stellifer

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Submitted on 2011-05-04 by David Thompson

Location (approximate): Paulding, Paulding, OH

Strat unit: Silica formation

Submitter notes: The Pseudoatrypa does not attract much epifauna but this one has the coral Aulopora microbuccinata spreading across it

Photo title: An old Brachiopod with epifauna

Taxa present: Pseudoatrypa devoniana, Aulopora microbuccinata

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Submitted on 2011-05-04 by David Thompson

Location (approximate): Paulding, Paulding, OH

Strat unit: Silica formation

Submitter notes: This brachiopod is 3.65 cm long by 2.9 cm wide

Photo title: Another view of old brachiopod

Taxa present: Pseudoatrypa devoniana, Aulopora microbuccinata

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Submitted on 2011-05-04 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This large Brachiopod is almost covered on top by an encrusting bryozoan. The Bryozoan has a very typical pattern of small raised monticules that identify it.

Photo title: Silica Brachiopod with epifauna

Taxa present: Paraspirifer bownockeri, Atactotoechus typicus

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