Submitted on 2025-09-03 by Joseph Koniecki

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This specimen is 5 cm tall. This specimen is one of those rare inflated specimen that are occasionally found. It was also found sitting on a piece of marcasite surrounded by softer shale.

Photo title: Trilobite

Taxa present: Eldredgeops milleri

View full record

Submitted on 2025-09-03 by Joseph Koniecki

Location (approximate): Milan, Washtenaw, MI

Strat unit: Silica formation

Submitter notes: Specimen is 6.5 cm top to bottom.

Photo title: Trilobite

Taxa present: Eldredgeops milleri

View full record

Submitted on 2025-09-03 by Joseph Koniecki

Location (approximate): Paulding, Paulding, OH

Strat unit: Silica formation

Submitter notes: This specimen is not as large as the previous but is still a very large specimen for this site. The trilobite measures 4.5 cm across the cephalon.

Photo title: Trilobite

Taxa present: Eldredgeops crassituberculata

View full record

Submitted on 2025-09-03 by Joseph Koniecki

Location (approximate): Arkona, Lambton, ON

Strat unit: Hungry Hollow formation

Submitter notes:

Photo title: Trilobites with Gastropod and Blastoid

Taxa present: Platyceras sp., Hyperoblastus sp., Pseudodechenella arkonensis

View full record

Submitted on 2025-09-03 by Joseph Koniecki

Location (approximate): Paulding, Paulding, OH

Strat unit: Silica formation

Submitter notes: Another large specimen. This one also measures 4.5 cm across the cephalon.

Photo title: Trilobite

Taxa present: Eldredgeops crassituberculata

View full record

Submitted on 2025-07-18 by John Topor

Location (approximate): Arkona, Lambton, ON

Strat unit: Arkona formation

Submitter notes: Formally Atractocrinus. Occurs in the upper Arkona Formation. It is usually found as just a calyx and rarely with a tegmen. Only one known specimen is preserved with a small amount of arms. The center specimen is 22mm tall. See scale in photo for size.

Photo title: Crinoid Calyxes

Taxa present: Atelestocrinus concinnus

View full record

Submitted on 2025-06-07 by Mary Ann Szwabowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This speciman is a crusher tooth plate

Photo title: Fish Tooth

Taxa present: ptyctodont

View full record

Submitted on 2025-05-30 by Mary Ann Szwabowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: The pyritized lophophore is exposed

Photo title: Pyritized Paraspirifer Lophophore

Taxa present: Paraspirifer bownockeri

View full record

Submitted on 2025-05-30 by Mary Ann Szwabowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: None

Photo title: Mucrospirifer encrusted with Bryozoan

Taxa present: Mucrospirifer prolificus, Fistulipora

View full record

Submitted on 2025-05-30 by Mary Ann Szwabowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Dundee formation

Submitter notes: None

Photo title: Rostroconch

Taxa present: Conocardium cuneas

View full record

Submitted on 2024-09-07 by Mary Ann Szwabowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: Perfectly enrolled trilobite

Photo title: Trilobite

Taxa present: Eldredgeops crassituberculata

View full record

Submitted on 2024-09-07 by Mary Ann Szwabowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This brachiopod is encrusted with bryozoan

Photo title: Brachiopod with Bryozoan

Taxa present: Fistulipora , Pseudoatrypa

View full record

Submitted on 2024-09-07 by Mary Ann Szwabowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This solitary coral is encrusted with bryozoan

Photo title: Solitary Coral

Taxa present: Fistulipora , Heliophyllum halli

View full record

Submitted on 2024-03-20 by Mary Ann Szwabowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: This brachiopod is encrusted with a peacock colored pyrite and measures 5.0 cm.

Photo title: Pyritized Brachiopod

Taxa present: Paraspirifer bownockeri

View full record

Submitted on 2024-03-20 by Mary Ann Szwabowski

Location (approximate): Sylvania, Lucas, OH

Strat unit: Silica formation

Submitter notes: Speciman measure about 6.0 cm

Photo title: Trilobite - Eldredgeops milleri

Taxa present: Eldredgeops milleri

View full record

Submitted on 2024-02-11 by Michael Lask

Location (approximate): Paulding, Paulding, OH

Strat unit: Silica formation

Submitter notes: 55 mm

Photo title: Eldredgeops crassituberculata

Taxa present: Eldredgeops crassituberculata

View full record

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

View full record

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

View full record

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.

View full record

Submitted on 2024-01-12 by Mary Ann Szwabowski

Location (approximate): Napoleon, Jackson, MI

Strat unit: Marshall formation

Submitter notes: This specimen from the lower Marshall Formation is a crusher tooth belonging to the Chondrichthyans class of fish and measures 12.7mm long

Photo title: Shark Tooth

Taxa present: Deltodus

View full record