Currently showing records 81 - 100 of 1727 total

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Aulopora microbuccinata Silica formation David Thompson

Submitted on 2014-10-03 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This large Brachiopod is encrusted with Aulopora microbuccinata which has grown over the lip of the Brachiopod meaning it was probably dead. The brachiopod is 6.1 cm wide by 4.1 cm long and 4.4 cm deep. This is heavily piritized as are many of the Sylvania fossils.

Photo title: Coral on Brachiopod

Taxa present: Aulopora microbuccinata

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Placoblastus obovastus Thunder Bay formation David Thompson

Submitted on 2014-10-03 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This is a straight comparison of size with my smallest sample and the largest

Photo title: The Little and the big.

Taxa present: Placoblastus obovastus

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Paraspirifer bownockeri Silica formation David Thompson

Submitted on 2014-10-02 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: Here is a large Bownockeri with a huge inarticulate Petrocrania hamiltonae attached. Inarticulates do not get much bigger then this. The Brachiopod is 5.6 cm wide, 4.2 cm long and 4.1 cm deep. The inarticulate is 2 cm around

Photo title: Large Brachiopod with Inarticulate.

Taxa present: Paraspirifer bownockeri

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Megastrophia concava Silica formation David Thompson

Submitted on 2014-10-02 by David Thompson

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: A nice big articulate brachiopod that is 5.4 cm wide and 4.6 cm long. Just visible on the hinge line is an inarticulate brachiopod shown in the next picture.

Photo title: Large Brachiopod

Taxa present: Megastrophia concava

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Megastrophia concavus Silica formation David Thompson

Submitted on 2014-10-02 by David Thompson

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: These inarticulates, the largest being Petrocrania hamiltonae, and 1.5 cm, are out of the way at the back of the big Megastrophia. The tiny ones are .76 mm and are in the Philhedra family but they may be stewerti or crenistriata sp., it is hard to tell.

Photo title: Multiple Inarticulates hiding out on the hinge line.

Taxa present: Megastrophia concavus

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Paraspirifer bownockeri Silica formation David Thompson

Submitted on 2014-10-02 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This is a side view of the previous Brachiopod.

Photo title: Another view

Taxa present: Paraspirifer bownockeri

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Megistocrinus nodosus Thunder Bay formation David Thompson

Submitted on 2014-10-02 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This Megistocrinus shows some wear and tear with a number of nodes damaged. It is 3 cm thick by 5. cm wide.

Photo title: Crinoid calyx

Taxa present: Megistocrinus nodosus

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Megistocrinus nodosus Thunder Bay formation David Thompson

Submitted on 2014-10-02 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: Two different sizes of the same species. The larger is in the previous photo, the small one is 3 cm thick by 5. cm wide.

Photo title: Big and small Megistocrinus nodosus

Taxa present: Megistocrinus nodosus

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Pithocrinus cooperi Alpena formation David Thompson

Submitted on 2014-10-02 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Alpena formation

Submitter notes: This is a nice crown with the calyx 3.8 cm wide and 2.8 cm deep. The overall crown is 8.1 cm long with nice arm definition

Photo title: Crinoid crown

Taxa present: Pithocrinus cooperi

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Strophodonta demissa Silica formation David Thompson

Submitted on 2014-10-02 by David Thompson

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: This small Brachiopod has two inarticulates. This is the ventral (bottom) side with the scar of a Petrocrania species showing.

Photo title: Strophodonta brachiopod with two inarticulates!

Taxa present: Strophodonta demissa

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Strophodonta demissa Silica formation David Thompson

Submitted on 2014-10-02 by David Thompson

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: This is the brachial (top) valve with an intact Petrocrania hamiltonae snugly in place. It is unusual to have inarticulates on both valves of a brachiopod.

Photo title: The other side of the previous brachiopod

Taxa present: Strophodonta demissa

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Paraspirifer bownockeri Silica formation David Thompson

Submitted on 2014-10-02 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This is a different brachiopod from the same location also encrusted with Aulopora microbuccianata. It also show a small hole in the shell that looks like a snail boring. This Brachiopod is 7. cm wide, 4.6 cm long and 4.3 cm thick.

Photo title: Another Brachiopod with corals

Taxa present: Paraspirifer bownockeri

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Paraspirifer bownockeri Silica formation David Thompson

Submitted on 2014-10-02 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This different view shows the inarticulate a bit better. see previous entry for sizes.

Photo title: Another view.

Taxa present: Paraspirifer bownockeri

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Fenestrellina sp. Silica formation Joseph Koniecki

Submitted on 2014-08-06 by Joseph Koniecki

Location (approximate): Paulding, Paulding, OH

Strat unit: Silica formation

Submitter notes: This colony measures 9 cm across the plate

Photo title: Bryozoa

Taxa present: Fenestrellina sp.

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Myzostomida Potter Farm formation David Thompson

Submitted on 2014-07-08 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: This is an infested crinoid stem with multiple small borings of a parasitic worm: Myzostomida. This has 9 borings in this one stem section. Not too much is known about these galls or tumors as they are also called. They are not too common.

Photo title: Parasitic gall on crinoid columnal

Taxa present: Myzostomida

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Myzostomida Potter Farm formation David Thompson

Submitted on 2014-07-08 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: The Myzostomida are an order of small marine polychaete worms, which are parasitic on crinoids causing gall swelling and holes but rarely leaving any other trace.

Photo title: Parasitic gall on crinoid

Taxa present: Myzostomida

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Gilbertsocrinus alpenensis Bell formation David Thompson

Submitted on 2014-05-26 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Bell formation

Submitter notes: This is the base view of the crinoid with snail. The Platyceras is visible at lower left. There is even a small bryozoan on the Platyceras. The base, including the snail, is 20mm wide by 16 mm tall by 12 mm. deep. Collected 5-23-14

Photo title: base of crinoid

Taxa present: Gilbertsocrinus alpenensis

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Gilbertsocrinus alpenensis Bell formation David Thompson

Submitted on 2014-05-26 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Bell formation

Submitter notes: The Bell shale is quite sparse and finding this crinoid with Platyceras attached was rare & unusual. The tegmen has been scraped open to reveal the attachment of the snail to the crinoid.

Photo title: Crinoid with Snail.

Taxa present: Gilbertsocrinus alpenensis

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Vasocrinus Alpena formation David Clark

Submitted on 2014-05-16 by David Clark

Location (approximate): Alpena, Alpena, MI

Strat unit: Alpena formation

Submitter notes: A very rare crinoid found on the flank beds of a bioherm by Travis Vivian.

Photo title: Vasocrinus calyx

Taxa present: Vasocrinus

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Botryocrinus thomasi Partridge Point formation David Clark

Submitted on 2014-05-16 by David Clark

Location (approximate): Alpena, Alpena, MI

Strat unit: Partridge Point formation

Submitter notes: A small calyx with interesting ornimentation from Partridge Point

Photo title: Botryocrinus thomasi calyx

Taxa present: Botryocrinus thomasi

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