Submitted on 2008-03-02 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: Like the genus Dolatocrinus, Megistocrinus has great plate ornamentation variability which can make classification to the species level difficult. There are probably only 2 or 3 species in the Hungry Hollow member. Loose plates of Megistocrinus are common in the formation and even partial specimens should be collected due to the rarity of whole calyxes. An inflated nearly perfect specimen of M. rugosus that in itself, is rare for the Hungry Hollow member. This specimen is 30mm in diameter and 24mm high. This photo shows the bottom view.

Photo title: Crinoid Calyx

Taxa present: Megistocrinus rugosus

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Submitted on 2008-03-02 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: The Hungry Hollow member coral zone was a high energy environment fragmenting many crinoids. Crinoid plates and stem fragments are common. Complete calyxes are very rare and partial or whole crowns are exceedingly rare! This cladid crinoid is the most common in the formation, however, all complete calyxes are considered rare. The specimen is 17mm in height and approximately 8.5mm wide.

Photo title: Partial Crinoid Crown

Taxa present: Synbathocrinus sp.

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Submitted on 2008-03-02 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: This specimen, like many crinoids in the Hungry Hollow member, needs revision. Deltacrinus is used here until it’s placement can be determined. Deltacrinus (a disparid), and Synbathocrinus (a cladid), are the most abundant crinoids in the formation. This specimen is 14mm wide and 40mm high including the stem and rests on matrix measuring 60 X 31mm.

Photo title: Partial Crinoid Crown

Taxa present: Deltacrinus sp.

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Submitted on 2008-03-02 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: A very rare crinoid also found in the Hamilton of New York State. The robust specimen measures 9mm in diameter and 9mm high. The other is 7mm in diameter and 10mm high.

Photo title: Crinoid Calyx

Taxa present: Cyttarocrinus jewetti

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Submitted on 2008-03-02 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: This crinoid was listed as Botryocrinus crassus in the 1958 Checklist before George McIntosh placed it in the genus Nuxocrinus. The three specimens shown range from 6-8.5mm in height and 6-7.5mm in diameter.

Photo title: Crinoid Calyx

Taxa present: Nuxocrinus crassus

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Submitted on 2008-03-02 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: This camerate crinoid is one of only a few known specimens from the Hungry Hollow member. It measures 44mm in diameter including the arm segments and 21mm high. The photo shows the tegmen(top) view.

Photo title: Crinoid Calyx

Taxa present: Gennaeocrinus kentuckiensis

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Submitted on 2008-03-02 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: This camerate crinoid is one of only a few known specimens from the Hungry Hollow member. It measures 44mm in diameter including the arm segments and 21mm high. The photo shows the side view.

Photo title: Crinoid Calyx

Taxa present: Gennaeocrinus kentuckiensis

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Submitted on 2008-03-02 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: This camerate crinoid is one of only a few known specimens from the Hungry Hollow member. It measures 44mm in diameter including the arm segments and 21mm high. The photo shows the bottom view.

Photo title: Crinoid Calyx

Taxa present: Gennaeocrinus kentuckiensis

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Submitted on 2008-03-02 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: These three, very large for the species, inflated blastoids from the shale are very high quality specimens. Most are found crushed. H. decipiens are often found retaining some of their delicate brachioles. The top row specimen measures 21mm high and 16mm in diameter. The bottom row left is 21.5mm high and 14.5mm in diameter and bottom right is 20mm high and 14.5mm in diameter.

Photo title: Blastoid

Taxa present: Hyperoblastus decipiens

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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 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 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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Submitted on 2008-03-12 by Pat Rutkowski

Location (approximate): Alpena, Alpena, MI

Strat unit: Genshaw formation

Submitter notes: This trilobite measures 31mm tall x 20mm wide.

Photo title: Trilobite

Taxa present: Crassiproetus microgranulatus

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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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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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