Submitted on 2008-04-28 by ummp invertebrate paleontology

Location (approximate): , Alpena, MI

Strat unit: Genshaw formation

Submitter notes: The average size of these specimens is 7 cm across. These specimens are homeotypes.

Photo title: Corals

Taxa present: Pinnatophyllum scyphus

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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 2008-03-30 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: Hungry Hollow formation

Submitter notes: These very rare sponges from the Hungry Hollow mb. are somewhat saucer-shaped and covered with smooth spicules. The slab measures 40mm x 35mm.

Photo title: Sponge (Porifera)

Taxa present: Gondekia hastula

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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: Hungry Hollow formation

Submitter notes: Evan Topor found this large crinoid calyx. The find was made even better when the large gastropod was uncovered alongside it. The crinoid is 27mm in diameter and the gastropod is 34mm in diameter. The slab is 88mm x 57mm.

Photo title: Crinoid Calyx and Gastropod

Taxa present: Dolatocrinus liratus, Naticonema lineata

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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: 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: 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: 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: 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: Hungry Hollow formation

Submitter notes: This camerate crinoid is slightly rarer than Dolatocrinus or Megistocrinus in the formation. Some specimens can be heavily pyritized. This partial crown measures 43mm high, 36mm wide and the calyx is about 14mm in diameter.

Photo title: Partial Crinoid Crown

Taxa present: Gilbertsocrinus spinigerus

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Submitted on 2008-03-30 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: A very rare crinoid calyx. The larger specimen measures 12mm x 9mm and the smaller is 7.5mm x 8.5mm.

Photo title: Crinoid Calyx

Taxa present: Pyrenocrinus berryorum

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Submitted on 2008-03-30 by Mike Topor

Location (approximate): Thedford, Lambton, ON

Strat unit: Widder formation

Submitter notes: This cluster of small blastoids is from the Rock Glen Sub member beds of the Widder Formation. Small size is typical for this un-described species, although it is closely equivalent stratigraphically (slightly higher) to the New York species H. goldringae. All of the specimens are 5-6mm in height and are on the large side. Most specimens are smaller.

Photo title: Blastoid

Taxa present: Hyperoblastus sp.

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Submitted on 2008-03-30 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: One of the rarest of all blastoids in any of the formations in the Arkona-Thedford area, this inflated specimen on matrix is 17.8mm tall and 9mm at the widest point.

Photo title: Blastoid

Taxa present: Pleuroschisma lycorias

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Submitted on 2008-03-30 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: One of the rarer blastoids occurring in the Hungry Hollow Fm., Its distinctive features include striations and bumps on the radials as well as highly ornamented basals. The largest of the pictured specimens measures 16mm in height and the smallest is 14.8mm tall.

Photo title: Blastoid

Taxa present: Hyperoblastus cummingsi

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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 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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