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: 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: 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: 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: 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: 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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Submitted on 2007-02-18 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This tabulate coral is restricted to the upper part of the formation. The largest of the five specimens shown is 40mm high by 30mm wide. The smallest is 25mm by 25mm.

Photo title: Tabulate Coral

Taxa present: Aulocystis ramosa

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Submitted on 2007-02-18 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: These tabulate corals are commonly attached to crinoid stems which probably enabled them to stay above the sea floor to improve their chances for food. These specimens are approximately 25mm in diameter.

Photo title: Tabulate Coral

Taxa present: Antholites speciosus

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Submitted on 2007-02-18 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: These somewhat common corals, like Antholites, are found attached to crinoid stems. Favorite hosts are the crinoids' Dolatocrinus and Megistocrinus. On some specimens, Cladochonus deforms the stem of it's host. It is not known how destructive this may have been, if at all, to the life of the crinoid host. The largest of the three pictured specimens is 30 X 40mm. The smallest colony is 22mm in diameter.

Photo title: Tabulate Corals

Taxa present: Cladochonus antiquus

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Submitted on 2007-02-18 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Top row: Contrasts a very large specimen (20mm) with a very small one (6mm) and 2 average size (12mm) specimens showing top and bottom views. Middle row: First specimen has turned-up margin; the second shows rejuvenation; the third is twins (two growing together); The fourth is encrusted with the Bryozoan, Eliasopora. The fifth is encrusted with Aulopora. Third row: Shows various attachments; #'s 1&2 are attached to trilobite fragments. #3 is attached to a tiny chonetid brachiopod. #4 is attached to a small crinoid columnal, and #5 is attached to a Pelecypod fragment.

Photo title: Button Corals

Taxa present: Microcyclus thedfordensis, Eliasopora stellatum, Aulopora sp., Eldredgeops sp.

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Submitted on 2007-02-18 by Mike Topor

Location (approximate): Thedford, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Occurs high in the Arkona formation in the same horizon as the button coral Microcyclus, but not as numerous. Because of it's shape it's often called the 'slipper coral'. The largest of the six specimens measures 13mm long and nearly as wide.

Photo title: Coral

Taxa present: Xenocyathellus thedfordensis

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Submitted on 2007-03-05 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: Alveolites is common in the Hungry Hollow member. This distinct colony coral is disc-shaped. This specimen is large for the species. Generally, younger specimens will exhibit a smoother surface. This un-cleaned coral shows patches of shale on its surface. A tiny colony of Botryllopora socialis has made a home on the shale near the center of the colony. You will need to zoom in to see it. The coral measures 135mm x 115mm and is approximately 45mm thick.

Photo title: Colony Coral

Taxa present: Alveolites goldfussi, Botryllopora socialis

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Submitted on 2007-03-05 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: This horn coral from the Hungry Hollow member is not common in the formation. This specimen is a very fine example. The coral is approximately 85mm long with a cup diameter of 45mm.

Photo title: Solitary Coral

Taxa present: Bethanyphyllum robustum

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Submitted on 2007-03-05 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: The photo shows three different views of three specimens. On the left is the top view showing the tegmen, the center shows a side view of the plate ornamentation, and on the right shows the stem attachment area. Of all the crinoids that occur in the formation, your best chance is finding this Dolatocrinus sp. However, all crinoids in the Hungry Hollow member are rare. See scale in photo for size.

Photo title: Crinoid Calyxes

Taxa present: Dolatocrinus bulbaceous

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Submitted on 2007-03-05 by Mike Topor

Location (approximate): Thedford, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: Heliophyllum halli comprises the bulk of the solitary coral species found in the “coral zone” of the Hungry Hollow member. They are the most common coral to be found there. These two specimens are slightly smaller than average, but show the general form well. The diameter of the specimen on the left is 39mm. The length of the coral on the right is 67mm and the width is 42mm.

Photo title:

Taxa present: Heliophyllum halli

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Submitted on 2007-03-05 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: A partial crown from the Arkona fm. Surrounded by stem fragments of the same species. Extremely rare! See scale in photo for size.

Photo title: Crinoid

Taxa present: Melocrinus

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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 2007-03-06 by Mike Topor

Location (approximate): Thedford, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: Views of the pedicle and brachial valves of two different specimens of the species. Rhipidomella vanuxemi is smaller than R. Penelope and not as common. The brachial valve is on the left and the pedicle valve on the right in the photo. These brachiopods are approximately 8mm thick. See scale in photo for size.

Photo title: Brachiopod

Taxa present: Rhipidomella vanuxemi

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Submitted on 2007-03-06 by Mike Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes: Views of the pedicle and brachial valves of three different specimens of the species: The top row is one specimen with the valves separate, each showing internal structure. The bottom row is two different brachiopods with exterior views of the pedicle valve (left) and the brachial valve (right). The pedicle valve of the internal view is also on the left side of the photo. They are much larger than P. vanuxemi and common in the formation. The two specimens on the bottom row are approximately 8mm thick and 35mm wide x 36mm high.

Photo title: Brachiopod

Taxa present: Rhipidomella penelope

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