Submitted on 2007-02-03 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Specimen is approximately 30mm in diameter

Photo title: Devonaster Starfish

Taxa present: Devonaster triradiatus

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Submitted on 2007-02-05 by John Topor

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: From Unit 9 of the Silica Fm. Specimen measures 120mm tall by 135mm wide at the arms (stem not included). Collected by Evan Topor

Photo title: Gilbertsocrinus Crown

Taxa present: Gilbertsocrinus ohioensis

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Submitted on 2007-02-14 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: Botryllopora is an encrusting bryozoan. It's favorite host is normally a horn coral. In this case, this large colony is attached to an unidentified matrix. The colony measures 65mm X 35mm.

Photo title: Bryozoan Colony on Matrix

Taxa present: Botryllopora socialis

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Submitted on 2007-02-14 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Specimen is 150mm in diameter. The most complete of three known specimens. This species has 28 arms. Note the large madreporite at the 11 o'clock position just outside of the mouth-angle plates.

Photo title: Multi-Armed Starfish

Taxa present: Arkonaster topororum

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Submitted on 2007-02-14 by John Topor

Location (approximate): Thedford, Lambton, ON

Strat unit: Widder formation

Submitter notes: Trilobite is 30mm long. Brachiopods are uncleaned. Cephalons and pygidia are common in the formation.

Photo title: Trilobite with Brachiopods on Matrix

Taxa present: Greenops widderensis, Mucrospirifer thedfordensis, Devonochonetes sp.

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Submitted on 2007-02-14 by John Topor

Location (approximate): Thedford, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: Two specimens, the larger being 27mm and the smaller one 15mm. Complete prone specimens of this trilobite are extremely rare in the formation.

Photo title: Trilobite Duo

Taxa present: Crassiproetus crassimarginatus

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Submitted on 2007-03-04 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: This gastropod is common in the Hungry Hollow member. However, it is an exceptionally well preserved specimen. Many are found partially crushed or missing pieces of shell. They can range in size from a few millimeters up to about 35mm in diameter. This gastropod is about 31mm in diameter and 22mm high.

Photo title: Gastropod

Taxa present: Naticonema lineata

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Submitted on 2007-03-04 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: Platyceras conicum is uncommon in the Hungry Hollow member. Complete specimens are hard to find as the pointed end is fragile and usually found broken off. This is an average size specimen. See scale in photo for size.

Photo title: Gastropod on Matrix

Taxa present: Platyceras conicum

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Submitted on 2007-03-04 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Atractocrinus occurs in the upper Arkona Formation. It is always found as just a calyx and rarely with a tegmen. Only one known specimen is preserved with a small amount of arms. The center specimen is 22mm tall. See scale in photo for size.

Photo title: Crinoid Calyxes

Taxa present: Atractocrinus concinnus

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Submitted on 2007-03-04 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Undescribed ophiuroids. These three are tentatively identified as belonging to the genus Furcaster. Brittle-stars are extremely rare in the formation. See scale in photo for size.

Photo title: Ophiuroid Cluster

Taxa present: Furcaster ? sp.

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Submitted on 2007-03-04 by John Topor

Location (approximate): Thedford, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This anchor-shaped holdfast belongs to the crinoid, Ancyrocrinus bulbosus. The holdfasts are uncommon finds and even these five specimens are preserved without their pointed tips. Ancyrocrinus crinoids, found as calyxes or crowns, are extremely rare in the Arkona fm. There are only three known calyxes and no crowns have been found. The largest specimen in the photo is 40mm and the smallest is 15mm in height.

Photo title: Crinoid Anchors (Holdfasts)

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: 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 2008-03-02 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: A rare gastropod from the Encrinal Limestone (hardground) section of the Hungry Hollow member of the Widder Formation. The larger specimen measures 26mm in diameter and the smaller 21mm.

Photo title: GASTROPOD

Taxa present: Turbonopsis shumardi

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