Submitted on 2008-03-12 by Pat Rutkowski

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This very rare enrolled trilobite would easily measure over 100mm(4 inches) if it was prone. The above photo shows the specimen from a side view. the trilobite is 55mm wide in this view.

Photo title: Trilobite

Taxa present: Dipleura dekayi

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Submitted on 2008-03-12 by Pat Rutkowski

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This very rare enrolled trilobite would easily measure over 100mm(4 inches) if it was prone. The above photo shows the specimen from a top view. the trilobite is 49mm wide in this view.

Photo title: Trilobite

Taxa present: Dipleura dekayi

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Submitted on 2008-03-12 by Pat Rutkowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This Ophuroid measures about 30mm in diameter. It rests on a slab that is 45mm x 36mm.

Photo title: Brittlestar

Taxa present: Strataster devonicus

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Submitted on 2008-03-12 by Pat Rutkowski

Location (approximate): Alpena, Alpena, MI

Strat unit: Alpena formation

Submitter notes: This rare fixed starfish from the Dock Street Clay member measures 27mm in diameter. The slab is 62mm square.

Photo title: Edrioasteroid

Taxa present: Agelacrinites sp.

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Submitted on 2008-03-12 by Pat Rutkowski

Location (approximate): Alpena, Alpena, MI

Strat unit: Alpena formation

Submitter notes: This inflated crown measures 95mm long x 94mm wide. The calyx is slightly crushed.

Photo title: Crinoid Crown

Taxa present: Pithocrinus cooperi

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Submitted on 2008-03-12 by Pat Rutkowski

Location (approximate): Alpena, Alpena, MI

Strat unit: Alpena formation

Submitter notes: A fine example of a complete crown with 165mm of stem. The crown measures 25mm x 28mm.

Photo title: Crinoid Crown

Taxa present: Pithocrinus cooperi

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Submitted on 2008-03-12 by Richard Heimlich

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This crown has its plate structure completely obscured by heavy pyritization.

Photo title: Pyritized Crinoid Crown

Taxa present: Gilbertsocrinus ohioensis

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Submitted on 2008-03-12 by Richard Heimlich

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: Two beautiful Arthroacantha crowns on a slab that measures 84mm x 94mm.

Photo title: Crinoid Crowns

Taxa present: Arthroacantha carpenteri

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Submitted on 2008-03-12 by David Thompson

Location (approximate): Jackson, Jackson, MI

Strat unit: Marshall formation

Submitter notes: This shows the more complex suturing of the amminoids compared to the nautiloids which are straight with simple rings. Unfortunately there is not too much of the fossil visible so identification is tentative. This is a typical example of the 'rusty' look of fossils in the Lower Marshall sandstone from th 'blue ridge esker' south of Jackson, MI

Photo title: Mississippian Amminoid from Lower Marshall Sandstone

Taxa present: Mercanites

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Submitted on 2008-03-12 by David Thompson

Location (approximate): Jackson, Jackson, MI

Strat unit: Marshall formation

Submitter notes: This is a full view of the specimen with the amminoid showing a number of different pelecypods including Palaeoneilo. Preservation is not as detailed as other matrix.

Photo title: Pelecypods from Mississippian Lower Marshall Sandstone

Taxa present: Mercanites , Palaeoneilo

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Submitted on 2008-03-12 by David Thompson

Location (approximate): Jackson, Jackson, MI

Strat unit: Marshall formation

Submitter notes: This is example of straight nautiloid from the Blue Ridge Esker south of Jackson along with a hash of pelecypods. In these photos a US 25 cent piece is used for scale.

Photo title: nautiloid from Lower Marshall Sandstone

Taxa present: Mooreoceras

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Submitted on 2008-03-12 by David Thompson

Location (approximate): Jackson, Jackson, MI

Strat unit: Marshall formation

Submitter notes: This is the reverse side of the previous example showing a gastropod (?) and a part of ammoniod (?) centered in this small block. This sandstone turns up in almost every parking lot in Michigan where cobble stones are used as fill around buildings. These were collected in the esker, however. A 25 cent piece for scale

Photo title: Gastropod from Mississippian Lower Marshall Sandstone

Taxa present: amminoid , gastropod

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Submitted on 2008-03-12 by David Thompson

Location (approximate): Grand Ledge, Eaton, MI

Strat unit: Saginaw formation

Submitter notes: This example is of an early, but now extinct 'seed fern,' or Pteridosperma. This was collected in the saginaw formation near Grand Ledge, MI at the Lincoln Brick Yard Park just north of the Grand River as were the other plant material shown here. All were collectred in the 1990's

Photo title: Early Pennsylvanian plants from the Saginaw formation at Grand Ledge, MI

Taxa present: Neuropteris tenuifolia

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Submitted on 2008-03-12 by David Thompson

Location (approximate): Grand Ledge, Eaton, MI

Strat unit: Saginaw formation

Submitter notes: This piece shows several stems and leaf parts in matrix but not enough for good identification as to taxon or species. This is how most of the plant materials appear

Photo title: Early Pennsylvanian plants from the Saginaw formation at Grand Ledge, MI

Taxa present: Plantae

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Submitted on 2008-03-12 by David Thompson

Location (approximate): Grand Ledge, Eaton, MI

Strat unit: Saginaw formation

Submitter notes: Here are several different examples of seed ferns (Pteridosperms) from the Grand ledge area. a US 25 cent piece is used for scale in all photos.

Photo title: Early Pennsylvanian plants from the Saginaw formation at Grand Ledge, MI

Taxa present: Neuropteris tenuifolia

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Submitted on 2008-03-12 by David Thompson

Location (approximate): Grand Ledge, Eaton, MI

Strat unit: Saginaw formation

Submitter notes: This strap-like leaf may be an example of Cordaitale which were common during this period in Michigan`but are also now extinct. Coin for scale.

Photo title: Pennsylvanian plant from the Saginaw formation at Grand Ledge, MI

Taxa present: Cordaites

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Submitted on 2008-03-12 by David Thompson

Location (approximate): Jackson, Jackson, MI

Strat unit: Marshall formation

Submitter notes: this is an example of the straight nautiloids from this formation in close up.

Photo title: Mississippian nautiloid from Lower Marshall Sandstone

Taxa present: Mooreoceras

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Submitted on 2008-03-12 by Pat Rutkowski

Location (approximate): Alpena, Alpena, MI

Strat unit: Alpena formation

Submitter notes: The gastropod sits atop the crinoid calyx near a Favosites coral. The entire specimen measures 83mm x 62mm.

Photo title: Crinoid Calyx with Spined Gastropod

Taxa present: Pithocrinus cooperi, Platyceras rarispinum, Favosites sp.

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Submitted on 2008-03-12 by Pat Rutkowski

Location (approximate): Alpena, Alpena, MI

Strat unit: Alpena formation

Submitter notes: This little crown measures 42mm high x 40mm wide.

Photo title: Crinoid Crown

Taxa present: Aorocrinus sp.

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Submitted on 2008-03-12 by Pat Rutkowski

Location (approximate): Alpena, Alpena, MI

Strat unit: Alpena formation

Submitter notes: An unusual flexible crinoid from the Dock Street Clay member. It measures 50mm high x 31mm wide and rests on a slab 69mm x 61mm. Formerly known as Cunctocrinus.

Photo title: Crinoid Crown

Taxa present: Halysiocrinus barrisi

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