Submitted on 2007-03-08 by David Thompson

Location (approximate): Thedford, Lambton, ON

Strat unit: Arkona formation

Submitter notes: The two parts united for the complete holdfast.

Photo title: The parts together

Taxa present: Ancyrocrinus bulbosus

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Submitted on 2007-03-12 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This crinoid named after a longtime collector from Thedford, Charlie Southworth, is very rare. The species was based on a single calyx that Charlie donated to a museum. This photo shows both a calyx and a small crown. The calyx measures 8mm in height and is 8mm wide at the base. The crown is 17mm high and 11mm wide.

Photo title: Rare Crinoid

Taxa present: Cadiscocrinus southworthi

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Submitted on 2007-03-12 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This specimen of Decadocrinus exhibits a complete anal sac and a small portion of arms. This Genus also occurs in the Hungry Hollow and Thedford members of the Widder Formation. The partial crown measures 20mm high and 9mm wide.

Photo title: Crinoid on Matrix

Taxa present: Decadocrinus wrightae

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Submitted on 2007-03-12 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Bryozoan colonies like this Leptotrypella become established on mature crinoidal lenses. Finding them relatively complete is a rare occurence. In most cases, they have to be reassembled. This colony measures 50mm by 30mm. The overall slab measures 75mm by 80mm.

Photo title: Bryozoan Colony

Taxa present: Leptotrypella quadrangularis

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Submitted on 2007-03-12 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Pictured are five individual brachiopods. The top and the two left specimens show the brachial valve. The two brachiopods on the right show the pedicle valve view. They are a very common index fossil of the Arkona Formation. They were capable of living in the soft, muddy substrate. Most are flattened. These 3D specimens are uncommon in the formation. The five brachiopods range in size from 65 to 75 millimeters long.

Photo title: Brachiopods

Taxa present: Mucrospirifer arkonensis

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Submitted on 2007-03-12 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: The top specimen on this slab of two Mucrospirifers is in living position. The broken, dispersed shell material below the brachiopod allows for other animals to establish themselves on the muddy sea floor. The length of the brachiopod in living position is about 6cm.

Photo title: Brachiopod in Living Position

Taxa present: Mucrospirifer arkonensis

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Submitted on 2007-09-07 by Mike Palescuk

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Common Arkona Shale (Rock Glen) specimens, unusual size and tip presevation

Photo title: Brachiopods

Taxa present: Mucrospirifer arkonensis

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Submitted on 2007-10-25 by Joseph Koniecki

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Decorocrinus arkonensis from the Devonian of Arkona, Ontario. Specimen is about 5 inches

Photo title: Crinoid crown with anal tube

Taxa present: Decorocrinus arkonensis

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Submitted on 2007-11-28 by Joseph Koniecki

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This is an extremely rare specimens with the brachioles attached. It is, however, not surprising that a few have been found considering the excellent preservation of other fossils in the Arkona Formation.

Photo title: Hyperoblastus with brachioles

Taxa present: Hyperoblastus decipiens

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Submitted on 2008-02-15 by Joseph Koniecki

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Note the gastropod with spines sitting on top of the calyx. This association is not unusual but to be able to see the spines on the gastropod is uncommon.

Photo title: Crinoid with gastropod

Taxa present: Arthroacantha carpenteri

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Submitted on 2008-02-17 by David Thompson

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This is another example of this small ornate crinoid from the Arkona that Mike Topor has other examples of on this site and gives a slightly different view of the cup and arms attachment. The edge of a US 10 cent piece is for scale with this tiny crinoid.

Photo title: Corocrinus calypso, crinoid crown

Taxa present: Corocrinus calypso

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Submitted on 2008-02-17 by Joseph Koniecki

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes:

Photo title: Complete crown in a starburst position

Taxa present: Corocrinus calypso

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Submitted on 2008-02-17 by Joseph Koniecki

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Specimen is about 3 cm long.

Photo title: Tentaculid

Taxa present: Tentaculites sp.

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Submitted on 2008-02-17 by Joseph Koniecki

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes:

Photo title: Crinoid

Taxa present: Poteriocrinus arkonensis

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Submitted on 2008-02-17 by Joseph Koniecki

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes:

Photo title: Crinoid calyx with anal tube

Taxa present: Poteriocrinus arkonensis

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Submitted on 2008-03-01 by ummp invertebrate paleontology

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This specimen is the holotype for the species. It is 12 cm tall.

Photo title: Crinoid

Taxa present: Proctothylacocrinus berryorum

UMMP specimen number: holotype 58656

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Submitted on 2008-03-02 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: A common, straight cephalopod from the Arkona Formation. They are pyritic internal molds with suture lines showing the chambers. They are most common from the Pyrite Zone. The average length in the photo is 20mm.

Photo title: Straight Cephalopod

Taxa present: Bactrites arkonensis

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Submitted on 2008-03-02 by John Topor

Location (approximate): Thedford, Lambton, ON

Strat unit: Arkona formation

Submitter notes: A straight cephalopod found in the upper section of the Arkona Formation. More common in the formation as one gets nearer to the Tile Yard in Thedford. This specimen is 75mm in length and 34mm in diameter.

Photo title: Straight Cephalopod

Taxa present: Dolorthoceras exile

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Submitted on 2008-03-02 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: A common, coiled ammonite that occurs in the Arkona Formation. They are pyritic internal molds showing their suture lines. These are large specimens for the Arkona shale with the larger one measuring 17mm and the smaller 15mm in diameter.

Photo title: Ammonite

Taxa present: Tornoceras (T.) arkonense

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Submitted on 2008-03-02 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: A somewhat common clam in certain horizons but rarer throughout the rest of the formation. They are often attached to hard crinoidal pieces. The large specimen is 30mm X 27mm. The smaller measures 25mm X 23mm.

Photo title: Pelecypod

Taxa present: Leiopteria ausablensis

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