Submitted on 2011-05-04 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This view shows the edge of the encrusting bryozoan on the top of the Brachiopod. The Brachiopod is 4.4 cm long by 5.8 cm wide.

Photo title: Second view of Brachiopod with Bryozoan

Taxa present: Paraspirifer bownockeri, Atactotoechus typicus

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Submitted on 2011-05-04 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This large brachiopod was infested by the worm, Cornulites, at an early stage. It also shows the tiny holes of the boring sponge, Clionoides, along what was once the lip of the Brachiopod. What is unusual here is that the worm died before the Brachiopod as the tube is truncated and the brachiopod continues to grow with a healing scar. The Brachiopod is 4.1 cm high by 5.9 cm wide.

Photo title: Brachiopod with healing worm scars

Taxa present: Paraspirifer bownockeri, Cornulites

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Submitted on 2011-06-09 by David Thompson

Location (approximate): Paulding, Paulding, OH

Strat unit: Silica formation

Submitter notes: Here are two examples of Atactotoechus typicus Bryozoan on a horn coral and on the Brachiopod, Megastrophia. The small raised regular monticules are visible on these examples. The Horn Coral is from the Silica formation in Paulding, Ohio and the Megastrophia is from the Silica of Milan, Michigan.

Photo title: Encrusting Bryozoan on varied taxon

Taxa present: Atactotoechus typicus, Heliophyllum halli, Megastrophia concava

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Submitted on 2011-06-09 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This is a Dolatocrinus barrisi with a Platyceras conicum attached to the tegmen. As J. Koniecki pointed out earlier in this listing, the Platyceras conicum is not listed in the species of the Alpena area but it is clear the the platyceras fauna was similiar to other areas of the Michigan Basin and this is another example. The crown and Platyceras are 1.54' or 3.9 cm tall and 1.24' or 3.3 cm wide. there are two additional views.

Photo title: Unusual Snail attached to Crinoid caylx

Taxa present: Dolatocrinus barrisi, Platyceras conicum

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Submitted on 2011-06-09 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: An additional view showing snail attachment to tegmen of crinoid

Photo title: Snail on crinoid

Taxa present: Dolatocrinus barrisi, Platyceras conicum

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Submitted on 2011-06-09 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This is the last view showing the attachment of the Platyceras to the crinoid. This is quite a small specimen and difficult to show all the details

Photo title: Third view of snail/Crinoid

Taxa present: Dolatocrinus barrisi, Platyceras conicum

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Submitted on 2011-06-09 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This is a Dolatocrinus asterias complete crinoid with full crown, feeding arms and stem, both disarticulated and complete of about 5' or 12.5 cm in length. The entire plate is 12.5' or 18 cm tall by 5' or 12.5 cm wide. the caylx itself is only .5' or 1.5 cm wide and the crown is a total of 4.5 cm tall.

Photo title: Complete small Crinoid on plate.

Taxa present: Dolatocrinus asterias

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Submitted on 2011-06-09 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: This is a close up view of the small crinoid previously. The species of Dolatocrinus asterias is quite variable in the plate structure of the calyx and this is a young example so the plates may not be typical.

Photo title: Detail of crinoid crown with feeding arms

Taxa present: Dolatocrinus asterias

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Submitted on 2011-08-14 by David Thompson

Location (approximate): Grand Ledge, Eaton, MI

Strat unit: Saginaw formation

Submitter notes: This is a root section of a Lycopod tree from the Pennsylvanian of central Michigan. The overall length of the root is 16.3 inches while the matrix is 10 inches long and about 3 inches deep. Rootlets can be seen going into the matrix. This is from the Lincoln Brick park near Grand Ledge and was collected in 1994. Lycopods were large trees that formed the deep swamps of the Pennsylvanian & this is probably from a Lepidodendron sp. All such root sections separated from the actual trees are labelled 'Stigmaria'

Photo title: Stigmaria. Overview of root and matrix

Taxa present: Stigmaria

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Submitted on 2011-08-14 by David Thompson

Location (approximate): Grand Ledge, Eaton, MI

Strat unit: Saginaw formation

Submitter notes: This shows the matching root and side rootlet scars in the matrix for this Stigmaria.

Photo title: Stigmaria and rootlets in matrix

Taxa present: Stigmaria

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Submitted on 2011-08-14 by David Thompson

Location (approximate): Grand Ledge, Eaton, MI

Strat unit: Saginaw formation

Submitter notes: This shows the root matched to the matrix showing the traces of the rootlets penetrating the matrix.

Photo title: Stigmaria root

Taxa present: Stigmaria

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Submitted on 2011-08-14 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Squaw Bay formation

Submitter notes: Although noted for nautiloids and especially ammonites, the Squaw Bay formation contains pieces of unknown wood. This is an example of wood preserved in the dense matrix and is about 6 inches long.

Photo title: Wood in Squaw Bay matrix

Taxa present: Wood

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Submitted on 2011-08-14 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Squaw Bay formation

Submitter notes: This photo shows the wood from the previous photo with it's counter half in the hard matrix since they split while being collected.

Photo title: Second wood example

Taxa present: Wood

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Submitted on 2011-08-21 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Squaw Bay formation

Submitter notes: This trace fossil is from the Squaw Bay formation of Alpena and is part of a larger piece. These trace fossils are attributed to a variety of causes from plant or algae fronds to worm feeding activity. The consensus seems to be for the systematic feeding activity of marine worms. This piece is about 18 inches long by 8 inches wide. A twelve inch ruler is for scale.

Photo title: 'rooster-tail' Trace Fossil, Zoophycos

Taxa present: Zoophycos

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Submitted on 2011-08-14 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This is another tiny pyritized crinoid from the Silica shale showing 11. mm of stem into cup that is 10.7 mm wide. The protective spines of this species did not protect it from the gastropod (possibly bucculentum sp.) from getting onto the tegmen.

Photo title: Crown of Gilbertsocrinus ohioensis with gastropod

Taxa present: Gilbertsocrinus ohioensis, Platyceras bucculentum

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Submitted on 2011-08-14 by David Thompson

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This photo shows the complete piece with a US ten cent piece for scale.

Photo title: Second view of Gilbertsocrinus

Taxa present: Gilbertsocrinus ohioensis, Platyceras bucculentum

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Submitted on 2011-08-21 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Squaw Bay formation

Submitter notes:

Photo title: Second view of Zoophycos

Taxa present: zoophycos

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Submitted on 2011-08-21 by David Thompson

Location (approximate): Jackson, Jackson, MI

Strat unit: Marshall formation

Submitter notes: This is the interior of a small section of nautiloid, probably Mooreoceras, that shows the Siphuncle and straight septa of the nautiloid. The piece is less then 1 inch or 2. cm

Photo title: Interior of small Nautiloid

Taxa present: Mooreoceras

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Submitted on 2011-08-21 by David Thompson

Location (approximate): Jackson, Jackson, MI

Strat unit: Marshall formation

Submitter notes: This is a small fragment of Ammonite from the Marshall sandstone. The internal whorl is visible but only a few of the simple sutures can be seen in the center making species identification difficult. The entire specimen is less then an inch across. A partial cast of the Pelecypod, Palaeoneilo sulcatina, is below the Ammonite.

Photo title: Ammonite

Taxa present: Ammonite , Palaeonnello sulcatina

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Submitted on 2011-08-21 by David Thompson

Location (approximate): Jackson, Jackson, MI

Strat unit: Marshall formation

Submitter notes: This piece has several Pelecypods,Palaeoneilo sulcatina, and nautiloids, Mooreoceras sp. as well as a fragment of gastropod in the center. The entire cluster is 3.4 inches or 8.6 cm wide

Photo title: Cluster of pelecypods, nautiloids

Taxa present: Palaeoneilo sulcatina, Mooreoceras marshallense, Gastropod

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