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Megistocrinus rugosus |
Four Mile Dam formation |
David Thompson |
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Submitted on 2007-03-09 by David Thompson
Location (approximate): Alpena, Alpena, MI
Strat unit: Four Mile Dam formation
Submitter notes: This example of Megistocrinus rugosus crinoid caylx shows how at times mineral replacement can be of a rich red Calcite, making a nice fossil more attractive. This was collected at a bioherm or fossil 'reef' in a quarry. This shows the stem base, the upper tegman is complete also.
Photo title: A 'carnelian' crinoid from Alpena
Taxa present: Megistocrinus rugosus
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Megistocrinus rugosus |
Four Mile Dam formation |
David Thompson |
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Submitted on 2007-03-09 by David Thompson
Location (approximate): Alpena, Alpena, MI
Strat unit: Four Mile Dam formation
Submitter notes: This shows the tegmen of the previous Megistocrinus rugosus with the red replacement. Traces of red are found in fossils near the bioherms but rarely a complete calyx with this much. U.S. Ten Cent piece for scale
Photo title: The tegmen of 'red' crinoid
Taxa present: Megistocrinus rugosus
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Eutaxocrinus sp. |
Four Mile Dam formation |
Stan Hyne |
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Submitted on 2007-11-03 by Stan Hyne
Location (approximate): Alpena, Alpena, MI
Strat unit: Four Mile Dam formation
Submitter notes: Undescribed crinoid from the Dock Street Clay prepared by Scott Vergiels
Photo title: RARE CRINOID CROWN
Taxa present: Eutaxocrinus sp.
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Undescribed sp. |
Alpena formation |
Scott Vergiels |
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Submitted on 2007-11-04 by Scott Vergiels
Location (approximate): Alpena, Alpena, MI
Strat unit: Alpena formation
Submitter notes: This is one of a handful of Devonian Cyclocystoids from North America and likely the only one from the basin.
Photo title: ? Rarest Michigan Basin Echinoderm
Taxa present: Undescribed sp.
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Euryocrinus barrisi |
Four Mile Dam formation |
ummp invertebrate paleontology |
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Submitted on 2008-02-22 by ummp invertebrate paleontology
Location (approximate): Alpena, Alpena, MI
Strat unit: Four Mile Dam formation
Submitter notes: Specimen is listed as being from the Dock Street Clay. Crown is 4 cm top to bottom.
Photo title: Crinoid crown
Taxa present: Euryocrinus barrisi
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Favosites clausus |
Four Mile Dam formation |
ummp invertebrate paleontology |
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Submitted on 2008-02-23 by ummp invertebrate paleontology
Location (approximate): Alpena, Alpena, MI
Strat unit: Four Mile Dam formation
Submitter notes: Specimen is about 10 cm across.
Photo title: Coral
Taxa present: Favosites clausus
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Basidechenella witherspooni
Type Specimen |
Alpena formation |
ummp invertebrate paleontology |
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Submitted on 2008-03-01 by ummp invertebrate paleontology
Location (approximate): Alpena, Alpena, MI
Strat unit: Alpena formation
Submitter notes: This specimen is the holotype for the species. It is 3 cm across
Photo title: Trilobite
Taxa present: Basidechenella witherspooni
UMMP specimen number: holotype 56620
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Stummiana arkonensis |
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 very rare little trilobite from the Dock Street Clay member. It measures 20mm long x 12mm wide.
Photo title: Trilobite
Taxa present: Stummiana arkonensis
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Neometacanthus callites |
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 very unusual trilobite. This specimen measures 37mm long x 21mm wide.
Photo title: Trilobite
Taxa present: Neometacanthus callites
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Agelacrinites 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 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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Pithocrinus cooperi |
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 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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Pithocrinus cooperi |
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 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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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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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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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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Megistocrinus sp. |
Alpena formation |
Stan Hyne |
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Submitted on 2008-03-13 by Stan Hyne
Location (approximate): Alpena, Alpena, MI
Strat unit: Alpena formation
Submitter notes: A tegmen(top)view of the calyx which measures 36mm in diameter and 33mm high.
Photo title: Crinoid Calyx
Taxa present: Megistocrinus sp.
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Megistocrinus sp. |
Alpena formation |
Stan Hyne |
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Submitted on 2008-03-13 by Stan Hyne
Location (approximate): Alpena, Alpena, MI
Strat unit: Alpena formation
Submitter notes: A bottom view of the calyx which measures 36mm in diameter and 33mm high.
Photo title: Crinoid Calyx
Taxa present: Megistocrinus sp.
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Megistocrinus sp. |
Alpena formation |
Stan Hyne |
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Submitted on 2008-03-13 by Stan Hyne
Location (approximate): Alpena, Alpena, MI
Strat unit: Alpena formation
Submitter notes: A side view of the calyx which measures 36mm in diameter and 33mm high.
Photo title: Crinoid Calyx
Taxa present: Megistocrinus sp.
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