Submitted on 2008-03-02 by John Topor

Location (approximate): Thedford, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: Quality single specimen trilobites’, found enrolled or prone, are rare for the formation. The Hungry Hollow member was a high energy environment which made preservation of complete specimens quite rare. Finding more than one trilobite genus on a slab is even rarer. From left to right the specimens measure 23.5mm X 18mm, 30mm X 18mm, and 32mm X 23mm. The second Basidechenella on the right of the Eldredgeops is upside down.

Photo title: Trilobite Group

Taxa present: Eldredgeops rana rana, Basidechenella arkonensis

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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 2008-03-02 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: 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 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 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: 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 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: 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: 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 1958 checklist by Stumm & Wright lists 9 different Dolatocrinus species. This genus exhibits a great deal of plate variation for any given species. With this in mind, Kesling & Mintz (1963) synonymies nine species into three; D. bulbaceous, D. liratus, and D. tridactylus are the species from the Hungry Hollow member listed in the order of their abundance in the formation; however, all are very rare. The three specimens of D. liratus in the photo show top, side, and bottom views. They all measure 17mm in diameter and average 15mm in height.

Photo title: Crinoid Calyx

Taxa present: Dolatocrinus liratus

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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. This specimen is 29mm in diameter and 19mm high. This photo is of the tegmen(top)view.

Photo title: Crinoid Calyx

Taxa present: Megistocrinus depressus

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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. This specimen is 29mm in diameter and 19mm high. This photo is of the side view.

Photo title: Crinoid Calyx

Taxa present: Megistocrinus depressus

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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. This specimen is 29mm in diameter and 19mm high. This photo is of the bottom view.

Photo title: Crinoid Calyx

Taxa present: Megistocrinus depressus

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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 tegmen top) 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: 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 side view.

Photo title: Crinoid Calyx

Taxa present: Megistocrinus rugosus

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Submitted on 2008-03-01 by ummp invertebrate paleontology

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This specimen is a hypotype. The carapace is 9 cm across and the set of teeth is 1 cm.

Photo title: Phyllocarid Teeth and carapace

Taxa present: Rhinocaris ehlersi

UMMP specimen number: hypotype 57370

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Submitted on 2008-03-01 by ummp invertebrate paleontology

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This specimen is a paratype and is 5.5 cm across.

Photo title: Phyllocarid Teeth

Taxa present: Herbertocaria wideneri

UMMP specimen number: paratype 57462

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Submitted on 2008-03-01 by ummp invertebrate paleontology

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: Specimen is 5 cm across both sets of teeth.

Photo title: Phyllocarid Teeth

Taxa present: Dithyrocaris neptuni

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Submitted on 2008-03-01 by ummp invertebrate paleontology

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This specimen is a hypotype and is 17 cm across.

Photo title: Trilobite

Taxa present: Dipleura dekayi

UMMP specimen number: hypotype 54161

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