Submitted on 2007-03-25 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This is the stem end of the Nucleocrinus m. described in the other two views.

Photo title: Third View of Blastoid

Taxa present: Nucleocrinus meloniformis

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Submitted on 2008-01-28 by David Thompson

Location (approximate): Milan, Washtenaw, MI

Strat unit: Traverse formation

Submitter notes: This is a rather large and thick piece of Arthrodire fish armor from the Silica Shale at the Martin-Marrietta Quarry in Milan, Michigan. The shield shows sensory lines at the edges and the characteristic 'bumps' over the bone.

Photo title: Protitanichthys cf. rockportensis, Cocosteomorph Fish Armor

Taxa present: Protitanichthys Rockportensis

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Submitted on 2008-01-28 by David Thompson

Location (approximate): Milan, Washtenaw, MI

Strat unit: Traverse formation

Submitter notes: The Phylum is Chordata, Subphylum Vertebrata, Class Elasmobranchiomorpha, Subclass Placoderm, Order Arthrodire, suborder Brachythoraci, Family Coccosteidae, Genus Protitanichthys. This shows some of the thickness of the bony shield. US .25 coin for scale.

Photo title: Second view of Protitanichthys, Devonian Fish Plate

Taxa present: Protitanichthys rockportensis

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Submitted on 2008-02-17 by David Thompson

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This is another example of this small ornate crinoid from the Arkona that Mike Topor has other examples of on this site and gives a slightly different view of the cup and arms attachment. The edge of a US 10 cent piece is for scale with this tiny crinoid.

Photo title: Corocrinus calypso, crinoid crown

Taxa present: Corocrinus calypso

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Submitted on 2008-02-17 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Traverse formation

Submitter notes: This is one of three views of this brachiopod from the Genshaw formation in the Lafarge Quarry of Alpena. This 'old' brachiopod is encrusted with bryozoan and some few Aulopora. Anything that was hard and still for very long had something living on it. I have collected very few of these brachiopods that were not damaged or missing valves.

Photo title: Sieberella romingeri, brachiopod

Taxa present: Sieberella romingeri, bryozoa

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Submitted on 2008-02-17 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Genshaw formation

Submitter notes: Second view of the top of this brachiopod.

Photo title: Sieberella romingeri, brachiopod

Taxa present: Sieberella romingeri

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Submitted on 2008-02-17 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Genshaw formation

Submitter notes: The third view of this brachiopod from the side to show the typical 'lamp shell'form of the specimen

Photo title: Sieberella romingeri, brachiopod

Taxa present: Sieberella romingeri

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Submitted on 2008-02-17 by David Thompson

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: This Mucrospirifer thedfordensis has a crinoid holdfast growing across the commissure. The roots are in both halves of the valves and this would only happen when the braciopod was dead.

Photo title: Mucrospirifer with crinoid holdfast

Taxa present: unknown crinoid holdfast , Mucrospirifer thedfordensis

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Submitted on 2008-02-17 by David Thompson

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: This is a top down view of the brachiopod showing a different view of the holdfast

Photo title: Mucrospirifer with crinoid holdfast

Taxa present: unknown crinoid holdfast , Mucrospirifer thedfordensis

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Submitted on 2008-02-17 by David Thompson

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: This is a small Helliophyllum with several smaller coralites growing from the edge after the main coral had been buried(?). Life is tenacious even for tiny organisms and they struggle to survive even if shortly they were all buried for the ages.

Photo title: Heliophyllum halli, coral with regeneration

Taxa present: Heliophyllum halli

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Submitted on 2008-02-24 by David Thompson

Location (approximate): Petoskey, Emmet, MI

Strat unit: Traverse formation

Submitter notes: This is one of three views of this coral from the West side of Michigan near Petoskey in Emmet County, MI. The correlation of Northwestern and Northeastern goes by different names from one side of the state to the other. This was collected in the 'Kegomic Quarry' just to the East of the city of Petoskey. This is now a series of expensive condominiums and off limits to collecting. The 'Petoskey formation' here is comparable to the Potter Farm/Thunder Bay Fms. at Alpena according to the U. of M. Papers in Paleontology No. 7

Photo title: Hexagonaria percarinata, Coral head

Taxa present: Hexagonaria percarinata

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Submitted on 2008-02-24 by David Thompson

Location (approximate): Petoskey, Emmet, MI

Strat unit: Traverse formation

Submitter notes: This second view shows the base of the coral head from the Petoskey formation with a US 10 cent piece for scale. The actual size is 5 1/4' wide (13. cm) by 4 3/4' long (11.5 cm) by 2 1/2' (6.5 cm) high. This coral had been preserved in sandy matrix and appears weathered but is quite pristine.

Photo title: Hexagonaria percarinata, Coral head

Taxa present: Hexagonaria percarinata

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Submitted on 2008-02-24 by David Thompson

Location (approximate): Petoskey, Emmet, MI

Strat unit: Traverse formation

Submitter notes: This last view is from the side of the previous two.

Photo title: Hexagonaria percarinata, Coral head

Taxa present: Hexagonaria percarinata

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Submitted on 2008-02-24 by David Thompson

Location (approximate): Charlevoix, Charlevoix, MI

Strat unit: Traverse formation

Submitter notes: These three views are of an unusual bryozoan that is rectangular rather then stick-like or encrusting or fan shaped. It seems to be unique to the Devonian of Western Michigan and does not appear in the East I am aware of. These are in matrix but as individual pieces they can be triangular and look almost man-made. these are from the 'Whiskey Creek' formation of the Charlevoix Limestone

Photo title: Scalaripora variosa, unusual bryozoan

Taxa present: Scalaripora variosa

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Submitted on 2008-02-24 by David Thompson

Location (approximate): Charlevoix, Charlevoix, MI

Strat unit: Traverse formation

Submitter notes: A different view of the same bryozoan specimen.

Photo title: Scalaripora variosa,

Taxa present: Scalaripora variosa

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Submitted on 2008-02-24 by David Thompson

Location (approximate): Charlevoix, Charlevoix, MI

Strat unit: Traverse formation

Submitter notes: A third example of this bryozoan

Photo title: Scalaripora variosa,

Taxa present: Scalaripora variosa

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Submitted on 2008-02-24 by David Thompson

Location (approximate): Marquette, Marquette, MI

Strat unit: Kona Dolomite formation

Submitter notes: This is an example of the 'Kona Dolomite' which is a stromatolite formed by the Cyanophyte, Collenia undosa. This is Pre-Cambrian from the Kona hills of Marquette County and shows the layered banding of sediments characteristic of Stromatolites. The actual blue-green algae is not present.

Photo title: Collenia undosa, Kona Dolomite

Taxa present: Collenia undosa

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Submitted on 2008-02-24 by David Thompson

Location (approximate): Marquette, Marquette, MI

Strat unit: Kona Dolomite formation

Submitter notes: This is a closer view of the previous block. Although the Kona Dolomite started out as dolomite, the pressures exerted through 2.2 Billion years has turned this into a rich marble with quartz inclusions and attractive colors

Photo title: Collenia undosa, Kona Dolomite

Taxa present: Collenia undosa

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Submitted on 2008-02-25 by David Thompson

Location (approximate): Arkona, Lambton, ON

Strat unit: Traverse formation

Submitter notes: These two examples show an unusual form of the coral, Favosites turbinatus, in the form of crinoid calyxes! The bases have stem or what appears to be stem attachments then the coralites are forming a cup or calyx that mimics a crinoid. On turning the form over (see next photo) the coral is very clear.

Photo title: unusual forms of Favosites coral

Taxa present: Favosites turbinatus

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Submitted on 2008-02-25 by David Thompson

Location (approximate): Arkona, Lambton, ON

Strat unit: Traverse formation

Submitter notes: This shows the reverse of the previous photo so that the coral can be seen mimicking the crinoid.

Photo title: second photo of unusual coral forms

Taxa present: Favosites turbinatus

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