Submitted on 2014-10-04 by Michael Lask

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: About 33 mm across

Photo title: Brachiopod

Taxa present: Mucrospirifer sp

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Submitted on 2014-10-04 by Michael Lask

Location (approximate): Toledo, Lucas, OH

Strat unit: Silica formation

Submitter notes: 71 mm along the curve, this was collected from the Seaway Quarry (near the Toledo Airport) during the spring of 2012 by Dan Edmondson. He also prepared it.

Photo title: Trilobite

Taxa present: Eldredgeops crassituberculata

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Submitted on 2014-10-04 by Michael Lask

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: 18 mm from the top of the arms to the bottom of the calyx. Collected and prepared by Patricia Rutkowski.

Photo title: Crinoid

Taxa present: Gilbertsocrinus ohioensis

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Submitted on 2014-10-04 by Michael Lask

Location (approximate): Alpena, Alpena, MI

Strat unit: Alpena formation

Submitter notes: About 240 mm across, this roughly 15 pound tree stump was collected b Patricia Rutkowski from the Antrim Shale of the Paxton Quarry. Callixylon Newberryi is a primitive conifer that dates back to the late Devonian Period, which is considered the time period when trees first evolved. The Callixylon is a member of the extinct order of tree like plants named Archaeopteridales. These plants with fern like leaves are estimated to be 350 to 375 Million years old making them among the worlds oldest trees. These tree like plants had leaves similar to ferns. For many years scientists classified Archaeopteris as a separate genus than Callixylonin under the order of Archaeopteridales. In the 1960s, paleontologists were able to demonstrate that the fossil wood known as Callixylon and the petrified fern leaf imprints known as Archaeopteris were actually part of the same plant. This plant no matter what it is called has turned out to be the link between trees and ferns.

Photo title: Plant

Taxa present: Callixylon newberryi

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Submitted on 2014-10-04 by Michael Lask

Location (approximate): Alpena, Alpena, MI

Strat unit: Alpena formation

Submitter notes: Collected by Patricia Rutkowski from the Antrim Shale of the Paxton Quarry, the specimen is 303 mm long. Callixylon Newberryi is a primitive conifer that dates back to the late Devonian Period, which is considered the time period when trees first evolved. The Callixylon is a member of the extinct order of tree like plants named Archaeopteridales. These plants with fern like leaves are estimated to be 350 to 375 Million years old making them among the worlds oldest trees. These tree like plants had leaves similar to ferns. For many years scientists classified Archaeopteris as a separate genus than Callixylonin under the order of Archaeopteridales. In the 1960s, paleontologists were able to demonstrate that the fossil wood known as Callixylon and the petrified fern leaf imprints known as Archaeopteris were actually part of the same plant. This plant no matter what it is called has turned out to be the link between trees and ferns.

Photo title: Plant

Taxa present: Callixylon newberryi

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Submitted on 2015-12-20 by Michael Lask

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: The stem alone is 137 mm long. Collected and prepared by Patricia Rutkowski. This incredible specimen is on a chunk of Arkona Shale that is over 15 inches long. Pat spent countless hours preparing this classic crinoid.

Photo title: Crinoid

Taxa present: Arthroacantha carpenteri

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Submitted on 2014-11-18 by Michael Lask

Location (approximate): Berkey, Lucas, OH

Strat unit: Silica formation

Submitter notes: 46 mm long. Collected and prepared by Patricia Rutkowski.

Photo title: Trilobite

Taxa present: Eldredgeops crassituberculata

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Submitted on 2014-11-18 by Michael Lask

Location (approximate): Berkey, Lucas, OH

Strat unit: Silica formation

Submitter notes: 35 mm from the top of the arms to the bottom of the calyx with about 29 mm of stem. Collected and prepared by Patricia Rutkowski.

Photo title: Crinoid

Taxa present: Logocrinus brandoni

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Submitted on 2015-12-20 by Michael Lask

Location (approximate): Berkey, Lucas, OH

Strat unit: Silica formation

Submitter notes: 43 mm long. Collected and prepared by Patricia Rutkowski.

Photo title: Trilobite

Taxa present: Eldredgeops milleri

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Submitted on 2015-12-20 by Michael Lask

Location (approximate): Berkey, Lucas, OH

Strat unit: Silica formation

Submitter notes: 24 mm across. Collected and prepared by Patricia Rutkowski.

Photo title:

Taxa present: Strataster devonicus

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Submitted on 2015-12-20 by Michael Lask

Location (approximate): Berkey, Lucas, OH

Strat unit: Ohio formation

Submitter notes: Dundee Limestone, Sylvania, Ohio (Devonian) - 40 mm. Rostroconchs are an extinct class of molluscs.

Photo title:

Taxa present: Hippocardia cunea

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Submitted on 2015-12-20 by Michael Lask

Location (approximate): Alpena, Alpena, MI

Strat unit: Squaw Bay formation

Submitter notes: 43 mm across. Collected by Patricia Rutkowski. Prepared by Scott Vergiels.

Photo title:

Taxa present: Tornoceras uniangulare

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Submitted on 2024-02-11 by Michael Lask

Location (approximate): Alpena, Alpena, MI

Strat unit: Squaw Bay formation

Submitter notes: 29 mm across. Collected by Patricia Rutkowski. Prepared by Scott Vergiels.

Photo title:

Taxa present: Koenenites cooperi

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Submitted on 2024-02-11 by Michael Lask

Location (approximate): Alpena, Alpena, MI

Strat unit: Squaw Bay formation

Submitter notes: The larger one is 34 mm across. Collected by Patricia Rutkowski. Prepared by Scott Vergiels.

Photo title:

Taxa present: Koenenites cooperi

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Submitted on 2015-12-20 by Michael Lask

Location (approximate): Alpena, Alpena, MI

Strat unit: Squaw Bay formation

Submitter notes: Koenenites cooperi (the largest is 63 mm across) and Bactrite warthini (54 mm long), Squaw Bay, Alpena, Michigan (Devonian). Collected and prepared by Patricia Rutkowski.

Photo title:

Taxa present: Koenenites cooperi

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Submitted on 2015-12-20 by Michael Lask

Location (approximate): Alpena, Alpena, MI

Strat unit: Squaw Bay formation

Submitter notes: 44 mm. Collected by Patricia Rutkowski.

Photo title:

Taxa present: Michelinoceras sp.

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Submitted on 2015-12-20 by Michael Lask

Location (approximate): Alpena, Alpena, MI

Strat unit: Squaw Bay formation

Submitter notes: 44 mm. Collected and prepared by Patricia Rutkowski.

Photo title:

Taxa present: Bactrite warthini

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Submitted on 2015-12-20 by Michael Lask

Location (approximate): Alpena, Alpena, MI

Strat unit: Squaw Bay formation

Submitter notes: 56 mm. This bivalve (clam!) was collected by Patricia Rutkowski.

Photo title:

Taxa present: Paneka sp.

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Submitted on 2015-12-20 by Michael Lask

Location (approximate): Alpena, Alpena, MI

Strat unit: Antrim formation

Submitter notes: 10 mm long

Photo title:

Taxa present: Lingula sp.

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Submitted on 2024-02-11 by Michael Lask

Location (approximate): Alpena, Alpena, MI

Strat unit: Paxton formation

Submitter notes: Dunkleosteus sp., Antrim Shale, Traverse Group, Paxton Quarry, Alpena, Michigan (Devonian) - 326 mm long (over a foot!) This is a section of the left, lower inferognathal element (part of the lower jaw). Collected and prepared by Patricia Rutkowski. She recovered part of it in 1994 and another part in 1998.

Photo title:

Taxa present: Dunkleosteus sp.

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