Submitted on 2007-03-09 by David Thompson

Location (approximate): Thedford, Lambton, ON

Strat unit: Widder formation

Submitter notes: Two different species of horn corals from Arkona & Thedford, Ontario that have the distinct 'scar' of attachment, the bottom valve of the inarticulate braciopod, Petrocrania hamiltoniae, clearly showing. The coral on the left is probablly Cystiphyllum sp.? while the one on the right is Heliophyllum halli. A U.S. Ten Cent piece is for scale. The top valve of the Inarticulate is missing showing the interior muscle scars.

Photo title: Horn Corals with inarticulate attachments

Taxa present: Heliophyllum halli, Petrocrania hamiltoniae, Cystiphyllum

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Submitted on 2007-03-09 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Four Mile Dam formation

Submitter notes: This example of Megistocrinus rugosus crinoid caylx shows how at times mineral replacement can be of a rich red Calcite, making a nice fossil more attractive. This was collected at a bioherm or fossil 'reef' in a quarry. This shows the stem base, the upper tegman is complete also.

Photo title: A 'carnelian' crinoid from Alpena

Taxa present: Megistocrinus rugosus

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Submitted on 2007-03-09 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Four Mile Dam formation

Submitter notes: This shows the tegmen of the previous Megistocrinus rugosus with the red replacement. Traces of red are found in fossils near the bioherms but rarely a complete calyx with this much. U.S. Ten Cent piece for scale

Photo title: The tegmen of 'red' crinoid

Taxa present: Megistocrinus rugosus

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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: Hungry Hollow formation

Submitter notes: These complete specimens were removed from the Hungry Hollow member in several pieces and then glued back together. The right side of the photo shows the base of each coral. The longer specimen measures 125mm. The shorter is about 75mm (not counting the bend). The diameters vary from 12 to 30 plus millimeters.

Photo title: Coral

Taxa present: Favosites (Emmonsia) arbuscula

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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): Thedford, Lambton, ON

Strat unit: Widder formation

Submitter notes: Three weathered-out examples of this well-known, common brachiopod. In the photo, the top right and bottom specimens show the brachial valve view and the top left shows the pedicle valve view. The largest is 52mm long, and the smallest is 40mm in length.

Photo title: Brachiopods

Taxa present: Mucrospirifer thedfordensis

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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 2007-03-12 by John Topor

Location (approximate): Thedford, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: From the left in the photo, three different blastoid thecas showing the basal, side and summit views of the Genus, Devonoblastus. The height of these specimens ranges from 15 to 18 millimeters.

Photo title: Blastoid Theca

Taxa present: Devonoblastus whiteavesi

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Submitted on 2007-03-14 by David Thompson

Location (approximate): Rockport, Alpena, MI

Strat unit: Bell formation

Submitter notes: This is an example of Dolatocrinus kutasii from the Bell Shale at Rockport, MI This is described in the 'Contributions from the Museum of Paleontolgy' which is available as a link to this website. Dr. Kesling's tongue in cheek description of the finding of the first complete specimen shows some of the enthusiasm he had for collecting. I found this Calyx in 1995 & it was cleaned by Scott Vergiels of the 'Friends'. This does show attached stem & a part of an arm with pinnules.

Photo title: A rare crinoid from the Bell Shale of Rockport, Alpena

Taxa present: Dolatocrinus kutasii

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Submitted on 2007-03-14 by David Thompson

Location (approximate): Rockport, Alpena, MI

Strat unit: Bell formation

Submitter notes: This shows a bit more stem & the arm & pinnules

Photo title: Another view of Bell Shale crinoid

Taxa present: Dolatocrinus Kutasii

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Submitted on 2007-03-25 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This is one of three views of this Nucleocrinus meloniformis (Barris) specimen collected at Partridge Point in Alpena, MI. This is the oral view with a U.S. Ten cent piece for scale. This large pristine blastoid was just rolling in the water!

Photo title: Thunder Bay Blastoid

Taxa present: Nucleocrinus meloniformis

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Submitted on 2007-03-25 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This is a side view of the Nucleocrinus m. showing Ambulacrum and detail of plates. 10 cent piece for scale. Although collected at Partridge Point, the formation is the Thunder Bay limestone.

Photo title: Second View of Blastoid

Taxa present: Nucleocrinus meloniformis

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Submitted on 2007-03-25 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This is the stem end of the Nucleocrinus m. described in the other two views.

Photo title: Third View of Blastoid

Taxa present: Nucleocrinus meloniformis

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Submitted on 2007-09-07 by Mike Palescuk

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes:

Photo title: Trilobite

Taxa present: Basidechenella rowi 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 2007-09-07 by David Clark

Location (approximate): Alpena, Alpena, MI

Strat unit: Genshaw formation

Submitter notes: Fish tooth from the Genshaw formation.

Photo title: Fish tooth

Taxa present: Onychodus sp.

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Submitted on 2011-12-27 by David Clark

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: Beautifully preserved Basidechenella with the axial spines. The Eldredgeops on the bottom right is a molt and missing it's head.

Photo title: Trilobite cluster

Taxa present: Basidechenella arkonensis, Eldredgeops

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