Submitted on 2014-10-08 by Ken Dobson

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This collection of small pyritized fossils includes a brachiopod, a crinoid calyx, and two cephalopods, one straight and the other coiled. All but the brachiopod are from Arkona, Ontario. The Brach is from Milan, Michigan.

Photo title: A collection of small pyritized fossils from the Ken Dobson collection

Taxa present: Tornoceras , unidentified cephalopod , Arthroacantha carpentari, Rhipidomella penelope

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Submitted on 2008-10-07 by Ken Dobson

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This small plate shows two species of crinoid from one location.

Photo title: A plate with two different species of crinoid from Arkona, Ontario

Taxa present: Corocrinus calypso, Decorocrinus arkonensis

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Submitted on 2008-10-07 by Ken Dobson

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes:

Photo title: A closer view of Corocrinus

Taxa present: Corocrinus calypso

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Submitted on 2008-10-07 by Ken Dobson

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Although this is not a complete crinoid crown, enough of the caalyx and anal tube or sac can identify the species.

Photo title: A closer view of Decorocrinus

Taxa present: Decorocrinus arkonensis

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Submitted on 2008-10-07 by Ken Dobson

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Here is a different specimen from Ken's collection that show the complete crown, arms, stem and anal sac extended.

Photo title: A complete crown with stem and anal sac

Taxa present: Decorocrinus arkonensis

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Submitted on 2008-10-07 by Ken Dobson

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This shows the anal sac or tube.

Photo title: Another view of the same Crinoid

Taxa present: Decorocrinus arkonensis

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Submitted on 2008-11-06 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: A typical fish plate from this formation. This one is on a concretion. Most fish material is fragmentary. This specimen measures 83mm X 62mm.

Photo title: Armored Fish Plate

Taxa present: Protitanichthys cf. rockportensis

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Submitted on 2008-11-06 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Many dental elements are classified under the name 'Ptychodont'. I assume that this specimen belongs to this genus. The specimen measures 48mm X 48mm.

Photo title: Armored Fish Dental Element

Taxa present: Protitanichthys sp.

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Submitted on 2008-11-06 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Dental elements are uncommon in the Arkona formation. This 'Ptychodont' lower jaw measures 90mm in length and 25mm at the thickest point.

Photo title: Armored Fish Dental Element

Taxa present: Protitanichthys sp.

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Submitted on 2008-11-06 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: These are the only fragments of this genus from the Arkona formation that I have collected. They are very rare. The largest plate measures 27mm X 21mm.

Photo title: Armored Fish Plates

Taxa present: Holonema sp.

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Submitted on 2008-11-06 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Material of this sort(thin film) is difficult to collect in the soft shales. I believe this is a lateral plate of the creature's carapace. It measures 102mm long X 44mm wide

Photo title: Phyllocarid

Taxa present: Rhinocaris sp.

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Submitted on 2008-11-06 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: These gastrointestinal mandibles are very rare in the Arkona formation as are any parts of this animal. It measures 16mm in length.

Photo title: Phyllocarid Mandibles

Taxa present: Echinocaris punctata

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Submitted on 2008-11-06 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Top view: This is a rare occurance of a brachiopod totally encrusted with a branching Bryozoan. It may well have been caused by a reworked environment. The specimen measures 52mm in length and 19mm at the widest point.

Photo title: Bryozoan Encrusted Brachiopod

Taxa present: Leptotrypella quadrangularis, Mucrospirifer arkonensis

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Submitted on 2008-11-06 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Bottom view: This is a rare occurance of a brachiopod totally encrusted with a branching Bryozoan. It may well have been caused by a reworked environment. The specimen measures 52mm in length and 19mm at the widest point.

Photo title: Bryozoan Encrusted Brachiopod

Taxa present: Leptotrypella quadrangularis, Mucrospirifer arkonensis

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Submitted on 2008-11-06 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: A highly pyritized and nearly complete straight cephalopod collected on matrix. This common species is rarely found on matrix. It measures about 40mm in length.

Photo title: Cephalopod

Taxa present: Bactrites arkonensis

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Submitted on 2008-11-06 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: View 1: Although never formally described to the species level, this very rare crinoid from the Arkona formation is similar to the Silica formation species. It measures 20mm high and 11mm wide.

Photo title: Crinoid

Taxa present: Euryocrinus laddii

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Submitted on 2008-11-06 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: View 2: Although never formally described to the species level, this very rare crinoid from the Arkona formation is similar to the Silica formation species. It measures 20mm high and 11mm wide.

Photo title: Crinoid

Taxa present: Euryocrinus laddii

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Submitted on 2008-11-07 by Joseph Koniecki

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: A spectacular plate with two complete crinoid crowns. In additon, there is another Arthroacantha and a Poteriocrinus on the bottom half of this plate (see next photo). There are also several Arthroacantha crowns on the back of this plate. It is 9 inches across the two crowns.

Photo title: Crinoid crowns

Taxa present: Arthroacantha carpenteri

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Submitted on 2008-11-07 by Joseph Koniecki

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This is the bottom half of the plate with the two Arthrocantha crowns. On the bottom half are two additional crinoids.

Photo title: Crinoid crowns

Taxa present: Arthroacantha carpenteri, Poteriocrinus arkonensis

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Submitted on 2008-11-07 by Joseph Koniecki

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Another spectacular individual crinoid crown. This crown is 4.5 inches tall.

Photo title: Crinoid crown

Taxa present: Arthroacantha carpenteri

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