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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Submitted on 2008-11-07 by Joseph Koniecki

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: This piece contains three crinoid crowns and a very large conularid.

Photo title: Crinoid crowns with a Conularid

Taxa present: Arthroacantha carpenteri, Conularia sp.

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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): 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 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: Alpena formation

Submitter notes: These were from bioherm areas of the Alpena Limestone

Photo title: Series of crinoid calyxes graded in size, tegmen view

Taxa present: Dolatocrinus asterias

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Submitted on 2008-11-23 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Alpena formation

Submitter notes:

Photo title: Bottom (stem) view of previous three crinoid calyxes

Taxa present: Dolatocrinus asterias

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Submitted on 2008-11-23 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Alpena formation

Submitter notes:

Photo title: Closeup view of largest caylx in previous entry

Taxa present: Dolatocrinus asterias

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Submitted on 2008-11-23 by David Thompson

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: Both of these crowns are very small but this little one is only 7 mm high.

Photo title: Closeup of the smallest crown from previous photo

Taxa present: Eutaxocrinus wideneri

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Submitted on 2008-11-23 by David Thompson

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: The US 10 cent piece is for scale .

Photo title: Big and little crinoid crown example of the same species.

Taxa present: Eutaxocrinus wideneri

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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 calyx was preserved in soft shale mud so that all the details were protected.

Photo title: well preserved caylx (bottom or stem view)

Taxa present: Megistocrinus multidecoratus

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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: Top or tegmen view of crinoid

Taxa present: Megistocrinus multidecoratus

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Submitted on 2008-11-23 by David Thompson

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: Although not common, these fossils are found in the Silica. This shows a crinoid stem that has coiled back upon itself around its attachment point. In this case the crinoid has attached to the inside of a Phacops trilobite head. The top of the crinoid stem and cirri attachments can be seen with four coils of the stem all around it

Photo title: A fossil oddity.

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: 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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