Welcome to Catnapin's

Devonian Fossil Gallery - Brachiopod

Brachiopoda, Articulata, Atrypidida

(Phylum, Class, Order)

Previous Arrow    Fossil Index     Next Arrow

Fossil identification by Jo Cox unless otherwise noted

*****************************************************************

?

(Family)

Atrypa is found from the Silurian through the Devonian periods.

#1  Atrypa reticularis

Period: Devonian

Stage: Frasnian

Formation: Lime Creek

Member: Cerro Gordo

Location: Bird Hill, north central Iowa

Collection: Jo Cox

Size: 15 mm wide

Identification: Charles Newsom, U. of Iowa

     

Description: This specimen is biconvex and reticulate.  Anterior margin is straight.

 

#2  Atrypa reticularis

Period: Devonian

Stage: Frasnian

Formation: Lime Creek

Member: Cerro Gordo

Location: Bird Hill, north central Iowa

Collection: Jo Cox

Size: 17 mm wide

Identification: Charles Newsom, U. of Iowa

        

Description: This specimen is biconvex (pedicle valve is much flatter) and reticulate. Anterior margin has a deep sulcus on the pedicle valve, and a very slight fold on the brachial valve.

 

#3  Atrypa reticularis

Period: Devonian

Stage: Frasnian

Formation: Lime Creek

Member: Cerro Gordo

Location: Bird Hill, north central Iowa

Collection: Jo Cox

Size: 20 mm wide

Identification: Charles Newsom, U. of Iowa

     

Description: This specimen is biconvex (pedicle valve is much flatter). It is reticulate, but not as much as #1 & #2. Anterior margin has a shallow sulcus on the pedicle valve, and a very slight fold on the brachial valve. Reticulation is strongest at the margin of the fold and the center of the sulcus.

*****************************************************************

Previous Arrow    Fossil Index     Next Arrow

Email:
fossilcritter"at"catnapin.com

to reduce spam, change "at" to @
please be specific

Home Page    IconWriting   Art Index   Martial Arts Index   Wildflower Index   Critter Index   About Us   Links

Copyright Notice:  All photos are copyrighted and protected by the laws of the United States.
Unauthorized duplication for sale or distribution is prohibited.