Submitted on 2011-01-05 by Joseph Koniecki

Location (approximate): Thedford, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This crinoids is 4.3 cm tall including the stem

Photo title: Crinoid

Taxa present: Gennaeocrinus mourantae

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Submitted on 2008-03-23 by Joseph Koniecki

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This coral specimen is 6 cm across.

Photo title: Coral

Taxa present: Aulocystis ramosa

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Submitted on 2008-03-23 by Joseph Koniecki

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This a very nice specimen showing a crinoid crown with two gastropods attached. The spines on the crinoid calyx are still attached. The very long spines of the gastropods are still in place. In addition, there is bryozoan in place on the gastropod (photo is in next datapoint entry). This specimen is 14 cm across from arm tip to arm tip.

Photo title: Crinoid with gastropods

Taxa present: Platyceras arkonense, Arthroacantha carpenteri, Sulcoretepora sp.

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Submitted on 2008-03-23 by Joseph Koniecki

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This is view two of the previous entry. This photo shows the bryozoan which was growning on the gastropod that was living on the crinoid. The bryozoan is only 1 cm tall. See previous entry for view of crinoid with gastropods.

Photo title: Bryozoan on gastropod on crinoid

Taxa present: Spiniplatyceras arkonense, Sulcoretepora sp., 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: 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: 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: 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: Arkona formation

Submitter notes: This small brachiopod is rare in the formation except in certain horizons. The average size in the photo is 13mm x 8mm tall.

Photo title: Brachiopod

Taxa present: Cyrtina arkonensis

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Submitted on 2008-03-30 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This un-described plant material can occur throughout the exposed Arkona Formation but is more common in certain horizons. Plump specimens are needed to show internal cell structure upon sectioning. In the photo, the widest specimen measures 25mm wide x 32mm long. The longest specimen is 42mm long x 17mm wide.

Photo title: Fossil Wood

Taxa present: Unknown 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 website contains photos of beautifully preserved Decorocrinus crowns. This pair of partial crowns shows the nature of the ornamentation on the calyx. The pair of crowns covers an area measuring 42mm x 38mm.

Photo title: Partial Crinoid Crowns

Taxa present: Decorocrinus arkonensis

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Submitted on 2008-04-27 by ummp invertebrate paleontology

Location (approximate): Thedford, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This slab of cephalopods ia approximately 20 cm across. It is probably one of the rarest fossils in the Arkona Fm. Fortunately, this slab is in the university collection.

Photo title: Cephalopds

Taxa present: Arkonoceras arkonense

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Submitted on 2008-05-16 by ummp invertebrate paleontology

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This specimen is 1.2 cm in diameter or 3 cm across the brachiopod.

Photo title: Edrioasteroid

Taxa present: Agelacrinites southworthi

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Submitted on 2008-05-27 by ummp invertebrate paleontology

Location (approximate): Thedford, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This specimen is 3 cm. It is a hypotype.

Photo title: Crinoid holdfast

Taxa present: Ancyrocrinus bulbosus

UMMP specimen number: hypotype 57641a

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