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Antholites speciosus Hungry Hollow formation Mike Topor

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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Koenenites cooperi Squaw Bay formation Joseph Koniecki

Submitted on 2007-02-18 by Joseph Koniecki

Location (approximate): Alpena, Alpena, MI

Strat unit: Squaw Bay formation

Submitter notes:

Photo title: Ammonites

Taxa present: Koenenites cooperi

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Cladochonus antiquus Hungry Hollow formation Mike Topor

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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Microcyclus thedfordensis, Eliasopora stellatum, Aulopora sp., Eldredgeops sp. Arkona formation Mike Topor

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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Xenocyathellus thedfordensis Arkona formation Mike Topor

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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Heteroschisma canadense Widder formation David Thompson

Submitted on 2007-02-17 by David Thompson

Location (approximate): Thedford, Lambton, ON

Strat unit: Widder formation

Submitter notes: This fully inflated Devonian Blastoid, Heteroschisma canadense, was found in this matrix with fragmants of bryzoan fronds, crinoid stems & corals pieces too small to identify. A U.S. 10 Cent piece for scale. In older literature, this is often called by the name,'Codaster'

Photo title: Another Hungry Hollow Blastoid

Taxa present: Heteroschisma canadense

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Gilbertsocrinus ohioensis, Platyceras Silica formation David Thompson

Submitted on 2007-02-17 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This Silica Crinoid, Gilbertsocrinus ohioensis, is beautifully displayed as a whole speciman elsewhere on this site. This example is a side view of the caylx with stem and showing the spine at the bottom in place while a small Platyceras is attached at the top right. Given the large spines on this crinoid, the Platyceras had to get on top some way other then crawling up the sides!

Photo title: Crinoid-Blastoid combination

Taxa present: Gilbertsocrinus ohioensis, Platyceras

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Gilbertsocrinus ohioensis, Platyceras Silica formation David Thompson

Submitted on 2007-02-17 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This view of the previous speciman shows the Platyceras more completely and another large spine at the bottom of the caylx. The Silica preservation has more pyrite in the fossils often making them rather 'brassy' looking.

Photo title: Another view of crinoid-platyceras

Taxa present: Gilbertsocrinus ohioensis, Platyceras

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Heteroschisma alatum Potter Farm formation David Thompson

Submitted on 2007-02-17 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: This is a nice large example of the Devonian Blastoid, Heteroschisma alatum, oral view with fingers for scale. As I was stepping across a ditch, this was directly in front of the toe of my boot, I called my companions to see it before I tried to pick this up as it was large & easily seen. I hoped it was & it did prove to be complete.

Photo title: Devonian Blastoid

Taxa present: Heteroschisma alatum

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Heteroschisma alatum Potter Farm formation David Thompson

Submitted on 2007-02-17 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: This is a view showing the ornamentation in the interambulacral area of this blastoid that is charactoristic for species identification.

Photo title: side view of blastoid

Taxa present: Heteroschisma alatum

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Rostroconchia Potter Farm formation David Thompson

Submitted on 2007-02-14 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: Rostroconchs are unusual mollusk with some controversy over where it fits in the evolution of the Mollusca. The Rostroconchs have their two halves connected at the back and are not seperate halves as are Brachiopods or Pelecypods. They have been treated as primitive branches of evolution in Mollusks but are also seen as their own Taxon within the Mollusks. Their strangeness is what attracts me.

Photo title: A Rostroconch from Alpena

Taxa present: Rostroconchia

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Rostroconchia Potter Farm formation David Thompson

Submitted on 2007-02-14 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: This view shows this mollusk from directly down on the speciman. This is about 1.5 cms. long.

Photo title: Rostroconch

Taxa present: Rostroconchia

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Hyperoblastus reimanni, Platyceras rarispinum, Fenestrellina Silica formation David Thompson

Submitted on 2007-02-14 by David Thompson

Location (approximate): Paulding, Paulding, OH

Strat unit: Silica formation

Submitter notes: This small piece of Devoinan sea bottom shows the Blastoid, Hyperoblastus reimanni, along with a Platyceras & a Bryozoan frond. The U.S. 10 cents piece is for scale

Photo title: Devonian Blastoid

Taxa present: Hyperoblastus reimanni, Platyceras rarispinum, Fenestrellina

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Botryllopora socialis Hungry Hollow formation John Topor

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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Arkonaster topororum Arkona formation John Topor

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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Greenops widderensis, Mucrospirifer thedfordensis, Devonochonetes sp. Widder formation John Topor

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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Crassiproetus crassimarginatus Hungry Hollow formation John Topor

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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Arthroacantha carpenteri Arkona formation David Thompson

Submitted on 2007-02-13 by David Thompson

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This is the top view of an Arthroacantha carpenteri crinoid calyx showing the anal pyramid with a very pronounced borehole. Again U.S. 10 cent pc. for scale.

Photo title:

Taxa present: Arthroacantha carpenteri

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Heliophyllum , Nucleocrinus elegans, Phacops Widder formation David Thompson

Submitted on 2007-02-12 by David Thompson

Location (approximate): Arkona, Lambton, ON

Strat unit: Widder formation

Submitter notes: This is how the speciman was found & collected with a nice Nucleocrinus blastoid with several 'horn' corals and a head for a Phacops(?) trilobite right next to the blastoid. This was collected at Hungry Hollow but in the upper Widder beds of the formations. A U.S.of A. 10 cent pc. is for scale.

Photo title: Nucleocrinus elegans in matrix

Taxa present: Heliophyllum , Nucleocrinus elegans, Phacops

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Spinocyrtia sp., Aulocystis commensalis Norway Point formation David Thompson

Submitted on 2007-02-12 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Norway Point formation

Submitter notes: This old Brachiopod was encrusted with several types of creatures living on her & they died with her also. There were boring sponges,'Clionoides' on the growth lines of her valves & Aulocystis tabulate coral on her brachial valve. There are some small bryzoan also but these are not identifiable. This brachiopod is from the Norway Point member, also known as the 'boat launch.' Scott Vergiels assisted in this identification.

Photo title: Spinocyrtia sp. with epifauna.

Taxa present: Spinocyrtia sp., Aulocystis commensalis

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