Submitted on 2008-11-23 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This shows the curved nature of the matrix in which the crinoid was washed(?) and covered with additional matrix to preserve all.

Photo title: Third view showing the 'pipe' in which the crinoid was preserved.

Taxa present: Botryocrinus thomasi

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Submitted on 2008-11-23 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes:

Photo title: A more detailed view

Taxa present: Botryocrinus thomasi

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Submitted on 2008-11-23 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This crinoid with crown and stem was preserved at the bottom of a channel and was covered by Bryozoa. This was revealed after the fronds of bryozoans were removed.

Photo title: Crinoid with stem and arms

Taxa present: Botryocrinus thomasi

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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:

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

Taxa present: Platyceras bucculentum, Cornulites , Gilbertsocrinus ohioensis

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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: 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:

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:

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: 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): 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): 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): 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): 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:

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: 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 2008-11-07 by Joseph Koniecki

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: A spectacular plate with two complete crinoid crowns. In additon, there is another Arthroacantha and a Poteriocrinus on the bottom half of this plate (see next photo). There are also several Arthroacantha crowns on the back of this plate. It is 9 inches across the two crowns.

Photo title: Crinoid crowns

Taxa present: Arthroacantha carpenteri

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Submitted on 2008-11-07 by Joseph Koniecki

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This is the bottom half of the plate with the two Arthrocantha crowns. On the bottom half are two additional crinoids.

Photo title: Crinoid crowns

Taxa present: Arthroacantha carpenteri, Poteriocrinus arkonensis

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Submitted on 2008-11-07 by Joseph Koniecki

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Another spectacular individual crinoid crown. This crown is 4.5 inches tall.

Photo title: Crinoid crown

Taxa present: Arthroacantha carpenteri

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