Submitted on 2009-02-05 by John Topor

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: Large pyritized specimens of Paraspirifer are common, but good small specimens are harder to come by. These 6 specimens were collected from unit 9. The largest measures 30mm x 24.5mm and the smallest is 25.8mm x 17mm.

Photo title: Brachiopod

Taxa present: Paraspirifer bownockeri

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Submitted on 2009-02-05 by John Topor

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: View #2: An uncleaned pyritized specimen from unit 9 of the Medusa North Quarry encrusted with the bryozoan Hederella. The larger Paraspirifer measures 54mm x 41mm.

Photo title: Brachiopod Pair

Taxa present: Paraspirifer bownockeri, Mediospirifer audaculus, Hederella sp.

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Submitted on 2009-02-05 by John Topor

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: View #1: An uncleaned pyritized specimen from unit 9 of the Medusa North Quarry encrusted with the bryozoan Hederella. The larger Paraspirifer measures 54mm x 41mm.

Photo title: Brachiopod Pair

Taxa present: Paraspirifer bownockeri, Mediospirifer audaculus, Hederella sp.

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Submitted on 2009-02-05 by John Topor

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: A common brachiopod in unit 7. Single valves showing good internal structure can be found. Pictured specimens range from 20-22mm long by 15-16mm wide

Photo title: Brachiopods

Taxa present: Pholidostrophia nacrea

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Submitted on 2009-02-05 by John Topor

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This common coral, found in the lower part of unit 7, is found at all Silica Fm. localities. The specimens in the photo range from 15mm to 25mm long.

Photo title: Coral

Taxa present: Aulocystis jacksoni

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Submitted on 2009-02-05 by John Topor

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: These bryozoans occur in bifoliate fronds often encrusted with the bryozoan Hernodia on its surface. From unit 7 of the Medusa North Quarry. The largest specimen measures 40mm x 20mm.

Photo title: Bryozoan

Taxa present: Intrapora irregularis

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Submitted on 2009-02-05 by John Topor

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: A heavily pyritized calyx showing the basal area spines. One of the more common crinoids of the formation. The calyx measures 22mm x 26mm and rests on matrix measuring 75mm x 61mm.

Photo title: Crinoid Calyx

Taxa present: Gilbertsocrinus ohioensis

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Submitted on 2009-02-05 by John Topor

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: These brachiopods occur in the upper part of the Silica Fm. in units 19, 22 & 23 encased in limestone. Their outer epidermal layer is missing due to exposure during blasting.

Photo title: Brachiopods

Taxa present: Leiorhynchus kelloggi

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Submitted on 2009-02-05 by John Topor

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: A very common brachiopod at this locality. The largest specimen measures 34mm x 16.4mm

Photo title: Brachiopods

Taxa present: Mucrospirifer prolificus

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Submitted on 2009-02-05 by John Topor

Location (approximate): Alpena, Alpena, MI

Strat unit: Thunder Bay formation

Submitter notes: One of four different genera that are found in this formation. This is a large specimen for the species. It measures 25.6mm high x 15mm at the widest point.

Photo title: Blastoid

Taxa present: Hyperoblastus bassleri

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Submitted on 2009-02-05 by John Topor

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: These three fine specimens were found together in the Medusa North Quarry. Note the different poses as they were not found on the same plane but were sort of loosely entwined. The one on the left measures 41.5mm x 28mm, Top right is 45.5mm x 26mm and lower right is 41mm x 23mm. Commonly known as Phacops.

Photo title: Trilobite Trio

Taxa present: Eldredgeops milleri

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Submitted on 2009-02-05 by John Topor

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: A large gastropod found in units 7-9. The specimen on the left in the photo measures 44mm x 35.5mm and the right is 42.5mm x 39mm.

Photo title: Gastropod

Taxa present: Platyceras bucculentum

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Submitted on 2009-02-05 by John Topor

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This brachiopod is common in unit 7. Specimens can show a great range of variation. The largest specimen in the photo measures 35mm x 36mm.

Photo title: Brachiopods

Taxa present: Pseudoatrypa devoniana

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Submitted on 2009-02-05 by John Topor

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: These specimens are likely from unit 7. Single valves are often found in this unit. The large specimen measures 24.5mm x 26.7mm.

Photo title: Brachiopod

Taxa present: Rhipidomella vanuxemi

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Submitted on 2009-02-05 by John Topor

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: VIEW #2: Zoarium of this species of bryozoan are usually present on the casts of the living chambers of cephalopods. In this case, a straight nautiloid cephalopod. The cephalopod measures 78.7mm long and 26mm at the widest point.

Photo title: Bryozoan encrusting a Cephalopod

Taxa present: Reptaria stolonifera

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Submitted on 2009-02-05 by John Topor

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: VIEW #1: Zoarium of this species of bryozoan are usually present on the casts of the living chambers of cephalopods. In this case, a straight nautiloid cephalopod. The cephalopod measures 78.7mm long and 26mm at the widest point. Note the small brachiopod attached on the right.

Photo title: Bryozoan encrusting a Cephalopod

Taxa present: Reptaria stolonifera

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Submitted on 2009-02-04 by John Topor

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: The bryozoan Hernodia is encrusting the bryozoan Intrapora. From unit 12 of the Medusa North Quarry. The largest of the 4 specimens in the photo measures 22mm long by 11mm wide.

Photo title: Bryozoan

Taxa present: Intrapora irregularis, Hernodia humifusa

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Submitted on 2009-02-04 by John Topor

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: A nice, large for the species, specimen measuring 13mm tall by 8.6mm wide. Most blastoids from this formation are small.

Photo title: Blastoid

Taxa present: Hyperoblastus reimanni

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Submitted on 2009-02-04 by John Topor

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: This rare blastoid is found in units 7, 13 & 14 of the Silica quarries. In old material collected in unit 13 it was more common and could sometimes be found with brachioles. This specimen measures 11.9mm X 9.1mm and is considered large.

Photo title: Blastoid

Taxa present: Hyperoblastus reimanni

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Submitted on 2009-02-04 by John Topor

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: These specimens were collected at the Martin-Marietta Quarry. The larger measures 25.3mm x 16.3mm.

Photo title: Brachiopod

Taxa present: Devonochonetes fragilis

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