Submitted on 2007-02-03 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This dual speciman shows a large adult & smaller trilobite. They are in the same layer & it would be nice to think of 'Mom & Baby' but the association may not be close at all. Clearly they were killed very quickly as they have not really started to enroll as this species often is found. This was self collected in Sylvania but prepared by Scott Vergiels of our 'Friends' who has prepared most of the trilobites I have posted. Sorry I'm old fashioned & these are still 'Phacops' to me.

Photo title: Phacops (Eldredgeops) milleri

Taxa present: Phacops (Eldredgeops) milleri

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Submitted on 2007-02-03 by David Thompson

Location (approximate): Paulding, Paulding, OH

Strat unit: Silica formation

Submitter notes: This is both a large & pristine example of this Taxon collected from Paulding Co. in Ohio. The speciman when collected had only a top of a few axial rings showing out of the shale.

Photo title: Pseudodechenella lucasensis

Taxa present: Pseudodechenella lucasensis

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Submitted on 2007-02-03 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Traverse formation

Submitter notes: This very large example of this Blastoid is hand held to give scale to the speciman. This is a side view to show the thin feeding grooves (ambulacra)

Photo title: Placoblastus obovatus

Taxa present: Placoblastus obovatus

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Submitted on 2007-02-03 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This is an Oral view of the same speciman with the Anal opening about 2:00 o'clock. Hands give scale

Photo title: Placoblastus obovatus

Taxa present: Placoblastus obovatus

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Submitted on 2007-02-03 by David Thompson

Location (approximate): Paulding, Paulding, OH

Strat unit: Silica formation

Submitter notes: This speciman is unusual due to the preservation & preparation from the underside which shows the Hypostome or mouth area. The thin shell is translucent in this view. Crassi's have 84 eye facets as opposed to 104 in the milleri species of this Devonian trilobite.

Photo title:

Taxa present: Phacops (Eldredgeops) rana crassituberculata

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Submitted on 2007-02-04 by David Thompson

Location (approximate): , Paulding, OH

Strat unit: Silica formation

Submitter notes: This third view of this Phacops continues to show the hypostome (mouth cover) and shows the 'pits' along the lip of this taxon. The exact purpose of these has been debated as locking points for the pygidium when the bug is enrolled or it may be something completely unrelated. Post your ideas!

Photo title:

Taxa present: Phacops (Eldredgeops) rana crassituberculata

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Submitted on 2007-02-05 by David Thompson

Location (approximate): Paulding, Paulding, OH

Strat unit: Silica formation

Submitter notes: This view of this trilobite shows the outside shell & eyes & is the second picture

Photo title:

Taxa present: Phacops (Eldredgeops) rana crassituberculata

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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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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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Submitted on 2007-02-12 by David Thompson

Location (approximate): Arkona, Lambton, ON

Strat unit: Widder formation

Submitter notes: This is another view in more detail of the Nucleocrinus blastoid from the Widder beds of Hungry Hollow. This shows the Phacops head to better advantage and the Heliophyllum coral behind them. The actual size of the blastoid is 1 cm. long exactly.

Photo title:

Taxa present: Heliophyllum halli, Phacops , Nucleocrinus elegans

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Submitted on 2007-02-12 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Traverse formation

Submitter notes: This is an unusual species with a Platyceras attached. Not too many Dolatocrinus with the snail attached. More often scars are found. This was found in the Alpena Limestone near a bioherm in Alpena. A dime is used for scale.

Photo title: Crinoid with snail

Taxa present: Dolatocrinus asterias, Platyceras bucculentum

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Submitted on 2007-02-12 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Traverse formation

Submitter notes: This view is of the top view of the crinoid showing the position of the Platyceras in relation to the anal opening & arms. This is from the Alpena Limestone but is from a bioherm in the formation where more crinoids are found. a dime is for scale.

Photo title:

Taxa present: Dolatocrinus asterias, Platyceras bucculentum

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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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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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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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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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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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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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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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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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