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Cordaites |
Saginaw formation |
David Thompson |
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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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Mooreoceras |
Marshall formation |
David Thompson |
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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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Pithocrinus cooperi, Platyceras rarispinum, Favosites sp. |
Alpena formation |
Pat Rutkowski |
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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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Aorocrinus sp. |
Alpena formation |
Pat Rutkowski |
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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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Halysiocrinus barrisi |
Alpena formation |
Pat Rutkowski |
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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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Athyris sp. |
Genshaw formation |
Stan Hyne |
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Submitted on 2008-03-12 by Stan Hyne
Location (approximate): Alpena, Alpena, MI
Strat unit: Genshaw formation
Submitter notes: A bed of several brachiopods on a slab measuring 117mm x 51mm.
Photo title: Brachiopods
Taxa present: Athyris sp.
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Tornoceras (T.) mesopleuron |
Arkona formation |
Stan Hyne |
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Submitted on 2008-03-12 by Stan Hyne
Location (approximate): Arkona, Lambton, ON
Strat unit: Arkona formation
Submitter notes: A pyritized partial specimen measuring 45mm x 17mm.
Photo title: Ammonite
Taxa present: Tornoceras (T.) mesopleuron
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Tornoceras arkonense |
Arkona formation |
Stan Hyne |
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Submitted on 2008-03-12 by Stan Hyne
Location (approximate): Arkona, Lambton, ON
Strat unit: Arkona formation
Submitter notes: Five small ammonites and a tiny gastropod from 11mm to 13mm in diameter.
Photo title: Ammonites and Gastropod
Taxa present: Tornoceras arkonense
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Megistocrinus concavus |
Thunder Bay formation |
Stan Hyne |
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Submitted on 2008-03-12 by Stan Hyne
Location (approximate): Alpena, Alpena, MI
Strat unit: Thunder Bay formation
Submitter notes: A tegmen(top) view of the calyx which measures 34mm in diameter and 25mm high.
Photo title: Crinoid Calyx
Taxa present: Megistocrinus concavus
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Megistocrinus concavus |
Thunder Bay formation |
Stan Hyne |
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Submitted on 2008-03-12 by Stan Hyne
Location (approximate): Alpena, Alpena, MI
Strat unit: Thunder Bay formation
Submitter notes: A bottom view of the calyx which measures 34mm in diameter and 25mm high.
Photo title: Crinoid Calyx
Taxa present: Megistocrinus concavus
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Megistocrinus concavus |
Thunder Bay formation |
Stan Hyne |
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Submitted on 2008-03-12 by Stan Hyne
Location (approximate): Alpena, Alpena, MI
Strat unit: Thunder Bay formation
Submitter notes: A side view of the calyx which measures 34mm in diameter and 25mm high.
Photo title:
Taxa present: Megistocrinus concavus
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Megistocrinus multidecoratus |
Thunder Bay formation |
Stan Hyne |
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Submitted on 2008-03-12 by Stan Hyne
Location (approximate): Alpena, Alpena, MI
Strat unit: Thunder Bay formation
Submitter notes: A tegmen(top) view of the calyx which measures 45mm in diameter and 37mm high.
Photo title: Crinoid Calyx
Taxa present: Megistocrinus multidecoratus
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Megistocrinus multidecoratus |
Thunder Bay formation |
Stan Hyne |
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Submitted on 2008-03-12 by Stan Hyne
Location (approximate): Alpena, Alpena, MI
Strat unit: Thunder Bay formation
Submitter notes: A bottom view of the calyx which measures 45mm in diameter and 37mm high.
Photo title: Crinoid Calyx
Taxa present: Megistocrinus multidecoratus
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Megistocrinus multidecoratus |
Thunder Bay formation |
Stan Hyne |
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Submitted on 2008-03-12 by Stan Hyne
Location (approximate): Alpena, Alpena, MI
Strat unit: Thunder Bay formation
Submitter notes: A side view of the calyx which measures 45mm in diameter and 37mm high.
Photo title: Crinoid Calyx
Taxa present: Megistocrinus multidecoratus
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Unknown |
Silica formation |
Stan Hyne |
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Submitted on 2008-03-12 by Stan Hyne
Location (approximate): Paulding, Paulding, OH
Strat unit: Silica formation
Submitter notes: A Ventral spine plate from an unknown placoderm fish.
Photo title: Placoderm Spine
Taxa present: Unknown
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Spongophyllum alpenense |
Potter Farm formation |
Stan Hyne |
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Submitted on 2008-03-12 by Stan Hyne
Location (approximate): Alpena, Alpena, MI
Strat unit: Potter Farm formation
Submitter notes: A very nice colony measuring 100mm x 71mm. Commonly known as Petosky stone.
Photo title: Colonial Coral
Taxa present: Spongophyllum alpenense
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Decadocrinus sp. |
Alpena formation |
Pat Rutkowski |
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Submitted on 2008-03-12 by Pat Rutkowski
Location (approximate): Alpena, Alpena, MI
Strat unit: Alpena formation
Submitter notes: This crown measures 38mm high with about 30mm of stem. The slab is 52mm x 46mm.
Photo title: Crinoid Crown
Taxa present: Decadocrinus sp.
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Synbathocrinus matutinus |
Thunder Bay formation |
Pat Rutkowski |
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Submitted on 2008-03-12 by Pat Rutkowski
Location (approximate): Alpena, Alpena, MI
Strat unit: Thunder Bay formation
Submitter notes: A rare small crown measuring 49mm high and 7mm wide. The slab measures 55m x 37mm.
Photo title: Crinoid Crown
Taxa present: Synbathocrinus matutinus
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Synbathocrinus matutinus |
Thunder Bay formation |
Pat Rutkowski |
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Submitted on 2008-03-12 by Pat Rutkowski
Location (approximate): Alpena, Alpena, MI
Strat unit: Thunder Bay formation
Submitter notes: A rare crinoid crown measuring 63mm high and 10mm wide. The slab measures 105m x 44mm.
Photo title: Crinoid Crown
Taxa present: Synbathocrinus matutinus
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Cadiscocrinus sp., Euryocrinus sp. |
Alpena formation |
Pat Rutkowski |
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Submitted on 2008-03-12 by Pat Rutkowski
Location (approximate): Alpena, Alpena, MI
Strat unit: Alpena formation
Submitter notes: A beautiful slab with two different crinoid genera and an unidentified coral. The slab measures 115mm x 117mm.
Photo title: Crinoid Crowns
Taxa present: Cadiscocrinus sp., Euryocrinus sp.
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