Submitted on 2007-02-14 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: Rostroconchs are unusual mollusk with some controversy over where it fits in the evolution of the Mollusca. The Rostroconchs have their two halves connected at the back and are not seperate halves as are Brachiopods or Pelecypods. They have been treated as primitive branches of evolution in Mollusks but are also seen as their own Taxon within the Mollusks. Their strangeness is what attracts me.

Photo title: A Rostroconch from Alpena

Taxa present: Rostroconchia

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Submitted on 2007-02-14 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: This view shows this mollusk from directly down on the speciman. This is about 1.5 cms. long.

Photo title: Rostroconch

Taxa present: Rostroconchia

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Submitted on 2007-02-17 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: This is a nice large example of the Devonian Blastoid, Heteroschisma alatum, oral view with fingers for scale. As I was stepping across a ditch, this was directly in front of the toe of my boot, I called my companions to see it before I tried to pick this up as it was large & easily seen. I hoped it was & it did prove to be complete.

Photo title: Devonian Blastoid

Taxa present: Heteroschisma alatum

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Submitted on 2007-02-17 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: This is a view showing the ornamentation in the interambulacral area of this blastoid that is charactoristic for species identification.

Photo title: side view of blastoid

Taxa present: Heteroschisma alatum

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Submitted on 2007-11-04 by Scott Vergiels

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: At about 19mm this blastoid is about twice the usual size for this species.

Photo title: 'Giant' Heteroschisma Blastoid

Taxa present: Heteroschisma alatum

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Submitted on 2007-11-04 by Scott Vergiels

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: Top view showing the ambulacra which measures 11mm across

Photo title: 'Giant' Heteroschisma Blastoid - Top View

Taxa present: Heteroschisma alatum

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Submitted on 2008-03-12 by Stan Hyne

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: A very nice colony measuring 100mm x 71mm. Commonly known as Petosky stone.

Photo title: Colonial Coral

Taxa present: Spongophyllum alpenense

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Submitted on 2008-03-22 by Joseph Koniecki

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: A beautiful colony that is 12 cm across. Photos do not do this grouping justice.

Photo title: Coral colony

Taxa present: Cylindrophyllum sp.

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Submitted on 2008-05-11 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: A complete coral head for the Spongophyllum alpenense species,similar to the famous 'Petoskey'stone,(Hexagonaria sp.) when these are water worn or polished. This is the natural fossil with unworn coralites as it was buried in sediment and preserved in detail.

Photo title: Spongophyllum alpenense, Coral head

Taxa present: Spongophyllum alpenense.

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Submitted on 2008-05-11 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: This is a side view of the Spongophyllum alpenense

Photo title: Another view of same coral head

Taxa present: Spongophyllum alpenense.

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Submitted on 2008-05-11 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: Closeup view of Spongophyllum alpenense coral showing detail of coralites. There are several Bryozoan colonies upon the same coral head. The coral is about 9'(22.8 cm) by 7' (17.7 cm) by 4 1/2' (11.4 cm) thick and weighs 8 1/2 lb or 3.85 Kg. This was removed from soft clay at the Potter Farm location in Alpena.

Photo title: Detail of coralites

Taxa present: Spongophyllum alpenense.

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Submitted on 2008-05-11 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes:

Photo title: very detailed view of coralites

Taxa present: Spongophyllum alpenense.

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Submitted on 2008-05-12 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: Another view of this large coral. The coral is 8'(20.5 cm)high by 9 1/2' (24. cm) wide. In the first view hand gives scale. In this a USA 25 cent piece is used.

Photo title: Another view of same branching coral,

Taxa present: Cystiphylloides petoskeyenes (potterenes?)

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Submitted on 2008-05-12 by David Thompson

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: This shows opening and internal structure of coral. This opening is 2' (5. cm) across.

Photo title: View of individual coralite,

Taxa present: Cystiphylloides petoskeyenes (potterenes?)

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Submitted on 2008-11-24 by Scott Vergiels

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: calyx view: Beautiful preservation from a clay layer. It measures 37mm in diameter.

Photo title: Horn Coral

Taxa present: Tabulophyllum traversense

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Submitted on 2008-11-24 by Scott Vergiels

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: side view: Beautiful preservation from a clay layer showing massive attachment talons. It measures 40mm high and 37mm in diameter.

Photo title: Horn Coral

Taxa present: Tabulophyllum traversense

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Submitted on 2008-11-24 by Scott Vergiels

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: Calyx view of a beautiful clay-layer coral. The specimen is 62mm high. Unfortunately, the city tinks this site looks better buried under a paved bicycle path!

Photo title: Rugose Coral

Taxa present: Tortophyllum cysticum

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Submitted on 2008-11-24 by Scott Vergiels

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: Side view of a beautiful clay-layer coral. The specimen is 62mm high. Unfortunately, the city tinks this site looks better buried under a paved bicycle path!

Photo title: Rugose Coral

Taxa present: Tortophyllum cysticum

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Submitted on 2008-12-02 by ummp invertebrate paleontology

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: This specimen is a paratype. It is 7 cm across.

Photo title: Coral - View #!

Taxa present: Favosites mammilatus

UMMP specimen number: paratype 47093

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Submitted on 2008-12-02 by ummp invertebrate paleontology

Location (approximate): Alpena, Alpena, MI

Strat unit: Potter Farm formation

Submitter notes: Close up of View #1.

Photo title: Coral - View #2

Taxa present: Favosites mammilatus

UMMP specimen number: paratype 47093

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