Currently showing records 261 - 271 of 271 total

More Info Image Taxa Strat Unit Contributor
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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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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Thunder Bay formation David Thompson

Submitted on 2017-09-04 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:

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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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Partridge Point formation David Thompson

Submitted on 2017-04-07 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Partridge Point formation

Submitter notes: This is a very small Placoblastus obovatus at just 17.3 mm long and 8.8 mm wide. The average is about 3.5 cm but they can be very much larger! When small these can be confused with the Neucleocrinus melonformis from the same formations

Photo title: Baby Placoblastus

Taxa present:

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Herbertocaris wideneri Silica formation David Thompson

Submitted on 2015-04-03 by David Thompson

Location (approximate): Paulding, Paulding, OH

Strat unit: Silica formation

Submitter notes: Here is a very complete example of a Phillocarid mandible or Gastric tooth. These are attributed to the two largest species of Phillocarid, either Dithyrocaris or Herbertocaris. It isn't clear which. This very complete jaw or attachment structure is rarely preserved. The "teeth" are 3.5 cm or 1 inch long the matrix is 9.5 cm by 6 cm. collected by me on 6/28/14.

Photo title: Phillocarid "Mandible" & jaw,

Taxa present: Herbertocaris wideneri

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Dundee formation David Thompson

Submitted on 2016-06-08 by David Thompson

Location (approximate): Paulding, Paulding, OH

Strat unit: Dundee formation

Submitter notes: Collected at Paulding and prepped by Scott Vergiels.

Photo title: Dundee Limestone Rostroconch

Taxa present:

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Dundee formation David Thompson

Submitted on 2016-06-08 by David Thompson

Location (approximate): Paulding, Paulding, OH

Strat unit: Dundee formation

Submitter notes: This specimen shows an injury to the Rostroconch early in life and it survived to continue growing.

Photo title: Damaged Rostroconch.

Taxa present:

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