Submitted on 2007-03-05 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: Trilobite fragments in the Hungry Hollow member are common, but complete prone specimens are very rare due to the jumbled density of corals, etc. in the “coral zone”. This trilobite’s pygidium was beginning to tuck under when burial took place. See scale in photo for size.

Photo title:

Taxa present: Eldredgeops (Phacops) rana rana

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Submitted on 2007-03-05 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Three different specimens of Proctothylacocrinus berryorum: one showing a portion of the anal sac and another with a partial stem are included in the photo. This species occurs in the upper Arkona fm. Very rare! See scale in photo for size.

Photo title: Crinoid Calyxes

Taxa present: Proctothylacocrinus berryorum

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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 2007-03-04 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): 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: 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: 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 2007-02-21 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This first view of this large & old Paraspirifer brachiopod shows the Left side of the fossil with several epifauna clearly visable. Near the hinge point is the scar of Cornulites sp. worm tube that create distinctive scars on both halves of the brachiopods valves. On the top bracial is Aulopra microbuccinata tabulate coral is quite visable & there is bryozoan intermixed with the corals but are hard to identify without higher magnification

Photo title: Silica Paraspirifer bownockeri and epifauna

Taxa present: Paraspirifer bownockeri, Cornulites , Aulopora microbuccinata

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Submitted on 2007-02-21 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This is the right side of the same Paraspirifer bownockeri showing additional epifauna. Again the top is heavily infested with Aulopora tabulate coral but also there is a scared area from an early injury & this has made a snug spot for the inarticulate brachiopod, Petrocrania hamiltoniae, to take up residence.

Photo title: Another view of same paraspirifer

Taxa present: Petrocrania hamiltoniae, Aulopora microbuccinata, Paraspirifer bownockeri

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Submitted on 2007-02-21 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This is a different Paraspirifer bownockeri then the previous two views of the same brachiopod. This example shows the scar and living tube of Cornulites worm that has been on this Paraspirifer a long time given the depth of the scar created. On the top is another large inarticulate brachiopod, Petrocrania hamiltoniae.

Photo title: Third example of Paraspirifer

Taxa present: Petrocrania hamiltoniae, Cornulites , Paraspirifer bownockeri

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Submitted on 2007-02-20 by David Thompson

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: This Platyceras has an inarticulate Brachiopod, Philhedra crenistriata, living on it. In the Devonian seas, if you were solid, someone started living on you quickly. This inarticulate has clear lines radiating from the center as a diagnostic feature and this shows clearly in this picture.

Photo title: Snail with inarticulate brachiopod

Taxa present: Platyceras bucculentum, Philhedra crenistriata

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Submitted on 2007-02-20 by David Thompson

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: This is a Platyceras with the bryozoan, Botryllopora socialis, encrusting it. Elsewhere on this site John Topor shows another example of this unique 'star-shaped' bryozoan on matrix. Here it is happily living on a snail. A 10 cent piece is for scale.

Photo title: Snail with Bryozoa

Taxa present: Botryllopora socialis, Platyceras bucculentum

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Submitted on 2007-02-19 by David Thompson

Location (approximate): Paulding, Paulding, OH

Strat unit: Silica formation

Submitter notes: The Phyllocarids were large shrimp-like crustaceans with four species identified in the Silica Formation. These mandibles are often found with nothing else to identify the species. This is a complete set from one side of the animal. 10 cent piece for scale.

Photo title: Phyllocarid 'jaw'

Taxa present: Phyllocarid mandible

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Submitted on 2007-02-19 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This Cystoid shows a considerable tail portion in addition to the body of this cystoid. The background is finely broken Bryzoan fronds. This is from the Thunder Bay Limestone near Partridge Point, Alpena. The U.S. 10 cent pc. is for scale. The body is 2 cm long with the additional tail just about 3 cm.

Photo title: Devonian Cystoid

Taxa present: Lipsanocystis traversensis

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Submitted on 2007-02-18 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: Phacops iowensis southworthi eyes always contain 13 dorsoventral files and is only known from the Hungry Hollow member of the Widder formation where it is very rare. (The holotype is only a cephalon) The species of P. iowensis and E. rana co-exist in only a few Hamilton formations. This cephalon of P. iowensis southworthi is preserved a few millimeters atop a nearly complete specimen of E. rana rana. The cephalon measures 35mm wide and 23mm high. The E. Rana rana measures 35mm long

Photo title: Trilobite Association

Taxa present: Phacops (Eldredgeops?) iowensis southworthi, Eldredgeops (Phacops) rana rana

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Submitted on 2007-02-18 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Corocrinus is the second most common crinoid in the formation behind Arthroacantha. It's distinctive ornamentation and three notches on the basals are characteristic of the crinoid. However, it's placement needs revision. The specimen is 22mm high and 15mm wide

Photo title: Crinoid Calyx

Taxa present: Corocrinus(?) calypso

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Submitted on 2007-02-18 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: The preservation of blastoids in the formation is exceptional. Clusters are very rare! This group of five larger specimens is indeed a find. The blastoids range in size from 10 - 13mm in height.

Photo title: Blastoid Cluster

Taxa present: Hyperoblastus filosa

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Submitted on 2007-02-18 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Certainly one of the most attractive crinoids of the formation. Very Rare! It was described by Winifred Goldring on a specimen that had regenerated arms.

Photo title: Crinoid Crown

Taxa present: Gennaeocrinus mourantae

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Submitted on 2007-02-18 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Corocrinus is the second most common crinoid in the formation next to Arthroacantha. This specimen shows the arm structure. The plates of the calyx are difficult to see because of pyrite. The crown measures 45mm high and 55mm wide.

Photo title: Crinoid Crown

Taxa present: Corocrinus(?) calypso

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Submitted on 2007-02-18 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: H. juvene is much smaller in size and not as common as Heliophyllum halli halli in the Hungry Hollow member. The largest of the three specimens in the photo is 40mm long and 15mm in diameter. The smallest is about 15mm long and wide.

Photo title: Horn Corals

Taxa present: Heliophyllum juvene

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