Submitted on 2008-11-23 by David Thompson

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: Given the fauna at this location, I would venture to call this a Arthroacantha stem but there is not sufficient data to do so.

Photo title: Another view of coiled stem.

Taxa present: unknown crinoid stem

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Submitted on 2008-11-23 by David Thompson

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: This is a very common brachiopod in the Silica and Arkona locations but that is NOT why I have put it on this site. This is the ventral view and is quite uninteresting really, not even complete. The story is on the other side.

Photo title: A common Silica brachiopod

Taxa present: Mucrospirifer thedfordensis

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Submitted on 2008-11-23 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: Attached to the slightly larger Brachiopod is a very tiny passenger that is complete in every way. This illustrates Jonathon Swift's famous quote; 'A flea hath smaller that on him prey, and these have smaller still to bite 'em; and so proceed ad infinitum.' This is not a prey situation but rather if it is hard and sits still; grow on it! The baby brachiopod is 5.6 mm long to the host's 20. mm.

Photo title: A tiny hitchhiker!

Taxa present: Mucrospirifer thedfordensis

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Submitted on 2008-11-23 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes:

Photo title: Another view of the baby Brachiopod

Taxa present: Mucrospirifer thedfordensis

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Submitted on 2008-11-23 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This lovely, complete caylx was found in the bottom of a boot print on the spoil piles of Sylvania, Ohio where I was able to retrieve it! 'acantha' means 'prickly' in Latin and each of the pustules on this calyx had a tiny movable spine on it to repel predators. these are often preserved but not in this specimen.

Photo title: A complete caylx

Taxa present: Athroacantha carpenteri

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Submitted on 2008-11-23 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This tegmen is without a gastropod and the anal tube is at 6:00 o'clock position

Photo title: Tegmen view of previous crinod caylx

Taxa present: Athroacantha carpenteri

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Submitted on 2008-11-23 by David Thompson

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: This Arthroacantha is from Milan, MI and is heavily pyritized but the Platyceras is clearly in place on the tegmen.

Photo title: Caylx with a gastropod

Taxa present: Athroacantha carpenteri, Platyceras bucculentum

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Submitted on 2008-11-23 by David Thompson

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes:

Photo title: Another view of crinoid/gastropod combination

Taxa present: Athroacantha carpenteri, Platyceras bucculentum

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Submitted on 2008-11-23 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: Note the 'prickly' thorns at the nodes of the arms which along with the spines on the caylx made these rather hard to hold. Note the gold pyrite triangle in the front arms where there had been a platyceras attached but was broken off.

Photo title: A crinoid crown.

Taxa present: Athroacantha carpenteri

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Submitted on 2008-11-23 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes:

Photo title: The back view of previous crinoid

Taxa present: Athroacantha carpenteri

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Submitted on 2008-11-23 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes:

Photo title: Detailed view of arms

Taxa present: Athroacantha carpenteri

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Submitted on 2008-11-23 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: The crinoid/snail combination is quite common and this is stem view of caylx

Photo title: A different species with gastropod

Taxa present: Gilbertsocrinus ohioensis, Platyceras bucculentum

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Submitted on 2008-11-23 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: Note that in this speciman, there are multiple 'worm tubes' or Cornulites around the opening of the Platyceras. I have not seen this association before. Usually the Cornulites infest the lip of the large Paraspirifer bownockeri from the Silica and need an open area at their mouth. How they could have had this with the Platyceras tightly attached to the crinoid tegmen is not clear to me.

Photo title: Tegmen view of previous crinod caylx showing the snail (Platyceras) in position

Taxa present: Platyceras bucculentum, Gilbertsocrinus ohioensis, Cornulites

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Submitted on 2008-11-23 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes:

Photo title: Side view of crinoid/snail with worm tubes

Taxa present: Platyceras bucculentum, Cornulites , Gilbertsocrinus ohioensis

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Submitted on 2014-10-04 by Michael Lask

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: Cephalon view: This is the first whole Trilobite I ever found. I was hunting with my daughter Zoe in the old North Quarry on June 23, 2007. This is the only one we found that day with a head. It might also be the last roller that Richard Heimlich ever prepared. The specimen measures 23.7mm x 14.8mm.

Photo title: Trilobite

Taxa present: Eldredgeops crassituberculata

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Submitted on 2014-10-04 by Michael Lask

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: Pygidium view: This is the first whole Trilobite I ever found. I was hunting with my daughter Zoe in the old North Quarry on June 23, 2007. This is the only one we found that day with a head. It might also be the last roller that Richard Heimlich ever prepared. The specimen measures 23.7mm x 14.8mm.

Photo title: Trilobite

Taxa present: Eldredgeops crassituberculata

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Submitted on 2014-10-04 by Michael Lask

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: Side view: This is the first whole Trilobite I ever found. I was hunting with my daughter Zoe in the old North Quarry on June 23, 2007. This is the only one we found that day with a head. It might also be the last roller that Richard Heimlich ever prepared. The specimen measures 23.7mm x 14.8mm.

Photo title: Trilobite

Taxa present: Eldredgeops crassituberculata

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Submitted on 2014-10-04 by Michael Lask

Location (approximate): Paulding, Paulding, OH

Strat unit: Silica formation

Submitter notes: An unprepared specimen in matrix. Collected in 2008. The slab measures 182mm x 140mm. The trilobite is 24mm X 26mm wide.

Photo title: Trilobite

Taxa present: Eldredgeops crassituberculata

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Submitted on 2008-11-24 by Michael Lask

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: Collected in North Quarry in 2007. Trilobite pygidium lies nearby. The clam measures 77mm x 69.4mm.

Photo title: Pelecypod

Taxa present: Limoptera curvata, Phacops sp.

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Submitted on 2008-11-24 by Michael Lask

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: Pedicle valve view of a classic Silica fm. brachiopod. Collected in the North Quarry in 2007. The specimen measures 55.5mm x 39.7mm.

Photo title: Brachiopod

Taxa present: Paraspirifer bownockeri

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