Submitted on 2008-03-30 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: One of my favorite crinoids from our collection, just the way it is splayed out makes it a very nice specimen. It measures 103mm x 68mm.

Photo title: Crinoid Crown

Taxa present: Arthroacantha carpenteri

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Submitted on 2008-03-30 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Two small Corocrinus crowns, each with a tiny Platyceras attached in this very typical manner. This species of snail seems to favor only Corocrinus. Note: dime for scale.

Photo title: Tiny Crinoid Crowns with Gastropods

Taxa present: Corocrinus calypso, Platyceras sp.

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Submitted on 2008-03-30 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: A small Arthroacantha crown with a tiny Corocrinus nestled in its arms. Note: dime for scale.

Photo title: Tiny Crinoid Crowns

Taxa present: Arthroacantha carpenteri, Corocrinus calypso

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Submitted on 2008-03-30 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Prone, nearly complete, trilobites are very rare for the Arkona Formation. Add a complete even rarer small starfish abutting the trilobite and you have a unique specimen. The trilobite measures 40mm x 25mm and the starfish is 22mm in diameter.

Photo title: Trilobite–Starfish Association

Taxa present: Eldredgeops milleri, Devonaster triradiatus

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Submitted on 2008-03-30 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Ancyrocrinus holdfasts are considered uncommon in the shale. This specimen retains two of the anchor points and a portion of the stem is attached. The square stem is a feature of this crinoid species. The length of the holdfast and stem is 78mm. The anchor points are approx. 35mm long.

Photo title: Crinoid Holdfast

Taxa present: Ancyrocrinus bulbosus

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Submitted on 2008-03-30 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Only three of these extremely rare crinoids are known. They may belong to A. bulbosus but further study is needed to determine that at the species level. The calyx measures 15mm x 11mm.

Photo title: Crinoid Calyx

Taxa present: Ancyrocrinus bulbosus

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Submitted on 2008-03-30 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: These very rare sponges from the Hungry Hollow mb. are somewhat saucer-shaped and covered with smooth spicules. The slab measures 40mm x 35mm.

Photo title: Sponge (Porifera)

Taxa present: Gondekia hastula

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Submitted on 2008-03-30 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This soft-bodied, preserved in three dimensions in pyrite, polychaete worm may just be the rarest fossil found in the Arkona formation. The annelid measures 40mm in length.

Photo title: Polychaete Worm (Annelid)

Taxa present: Arkonips topororum

UMMP specimen number: holotype

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Submitted on 2008-03-30 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: Evan Topor found this large crinoid calyx. The find was made even better when the large gastropod was uncovered alongside it. The crinoid is 27mm in diameter and the gastropod is 34mm in diameter. The slab is 88mm x 57mm.

Photo title: Crinoid Calyx and Gastropod

Taxa present: Dolatocrinus liratus, Naticonema lineata

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Submitted on 2008-03-30 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: These cone-shaped (always flattened in the Arkona formation) fossils had a very thin phosphatic shell. Difficult to collect in one piece and very rare in the formation, their exact placement is still being debated but placement seems to favor their own phylum. It is believed they were able to attach themselves to shells or other material on the sea floor and cluster in a group. This partial specimen is 125mm tall x 120mm at greatest width.

Photo title: Conularid

Taxa present: Conularia sp.

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Submitted on 2008-03-30 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This beautiful large edrioasteroid is attached to a pelecypod and is incredibly rare in the formation. This specimen is 22mm in diameter.

Photo title: Edrioasteroid

Taxa present: Krama devonicum

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Submitted on 2008-03-30 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: A complete crown preserved in a starburst position and very heavily pyritized except for some of the arm tips. The calyx is covered with spines. This specimen measures 41m x 47mm.

Photo title: Pyritized Crinoid Crown

Taxa present: Arthroacantha carpenteri

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Submitted on 2008-03-30 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: The checklist of fossils from the area lists four different species of Fenestella from the Hungry Hollow mb. Most bryozoa are difficult to identify and require thin sectioning for positive I.D. I can identify only by sight. This specimen nearly covers the slab measuring 79mm x59mm.

Photo title: Bryozoan

Taxa present: Fenestella arkonensis

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Submitted on 2008-03-30 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: The checklist of fossils from the area lists four different species of Fenestella from the Hungry Hollow mb. Most bryozoa are difficult to identify and require thin sectioning for positive I.D. I can identify only by sight. This specimen is 40mm high and 35mm wide and rests on a slab 42mm x 60mm.

Photo title: Bryozoan

Taxa present: Fenestella arkonensis

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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 small colony showing the nature of the cups. The specimen measures 51mm x 39mm.

Photo title: Colonial Coral

Taxa present: Eridophyllum subcaespitosum

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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 large colony was attached to the hardground uppermost surface of the Encrinal limestone just below the coral zone. The size of this coral colony measures 9in. x 9in.

Photo title: Colony Coral

Taxa present: Eridophyllum archiaci

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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 bryozoa has a distinctive branching pattern. Not rare in the formation but hard to find large specimens as most are fragmented. These small slabs measure about 30mm in diameter.

Photo title: Bryozoan

Taxa present: Taeniopora exigua

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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 common brachiopod found in the formation. The smaller measures 29mm x 29mm and the larger 32mm x 31mm.

Photo title: Brachiopod

Taxa present: Atrypa reticularis

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Submitted on 2008-03-30 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: Most specimens of this brachiopod are somewhat flattened. Plump specimens are rare. The bottom row specimens in the photo each measure 31mm x 23mm. The top one measures 19mm wide and 13mm thick.

Photo title: Brachiopod

Taxa present: Callipleura nobilis

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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 common brachiopod found in the formation. The smaller measures 16mm x 16mm and the larger 23mm x 18mm.

Photo title: Brachiopod

Taxa present: Athyris spiriferoides

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