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 2008-03-02 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 2008-03-30 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: One of the rarer blastoids occurring in the Hungry Hollow Fm., Its distinctive features include striations and bumps on the radials as well as highly ornamented basals. The largest of the pictured specimens measures 16mm in height and the smallest is 14.8mm tall.

Photo title: Blastoid

Taxa present: Hyperoblastus cummingsi

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Submitted on 2008-03-30 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: One of the rarest of all blastoids in any of the formations in the Arkona-Thedford area, this inflated specimen on matrix is 17.8mm tall and 9mm at the widest point.

Photo title: Blastoid

Taxa present: Pleuroschisma lycorias

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Submitted on 2008-03-30 by Mike Topor

Location (approximate): Thedford, Lambton, ON

Strat unit: Widder formation

Submitter notes: This cluster of small blastoids is from the Rock Glen Sub member beds of the Widder Formation. Small size is typical for this un-described species, although it is closely equivalent stratigraphically (slightly higher) to the New York species H. goldringae. All of the specimens are 5-6mm in height and are on the large side. Most specimens are smaller.

Photo title: Blastoid

Taxa present: Hyperoblastus sp.

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Submitted on 2008-03-30 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: A very rare crinoid calyx. The larger specimen measures 12mm x 9mm and the smaller is 7.5mm x 8.5mm.

Photo title: Crinoid Calyx

Taxa present: Pyrenocrinus berryorum

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Submitted on 2008-03-30 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: This camerate crinoid is slightly rarer than Dolatocrinus or Megistocrinus in the formation. Some specimens can be heavily pyritized. This partial crown measures 43mm high, 36mm wide and the calyx is about 14mm in diameter.

Photo title: Partial Crinoid Crown

Taxa present: Gilbertsocrinus spinigerus

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