Sieberella roemeri? Brachiopod

A mold of the internal structure of what I think is a Sieberella roemeri? brachiopod.  Fossil found in the Silurian Waldron Shale of Clark County, Indiana, USA.  The Index Fossils of North America list the genus Sieberella named by Oehlert in 1887.  The species was named by Hall and Clarke and is similar to a Gypidula coeymanensis and also was referred to as a Pentamerus sieberi by Buch.

This particular brachiopod is hard to find and so far I have only found two with them both being internal impression of one valve.  Fossil marks the 19th brachiopod species identified in the Waldron Shale.  See the others at this posting: CLICK HERE

National Fossil Day 2011

It's National Fossil Day™ in the United States.  There are no events planned in the area where I live.  Even so, I will try and find a fossil or something to commerate the day.

Go to the official web site to learn more: http://nature.nps.gov/geology/nationalfossilday/

Note National Fossil Day is a trademark of the National Park Service.

Orbitremites kentuckiensis Blastoid

Today's posting is a super rare treat! The fossil shown here is a paratype of the blastoid Orbitremites kentuckiensis.  This fossil is one of two left in the personal collection of Dr. James Conkin who named it.  The holotypes are stored at the Smithsonian National Museum of Natural History (USNM PAL 127316): CLICK HERE TO SEE.   Amazingly, the Smithsonian has imaged these specimens in their database.  It is rare that I find specimens in their HUGE database that have been imaged.  Maybe they like pyritized blastoids which appear to be very rare.  The fossils might also consist of marcasite which if not properly stored can break down (pyrite disease) into melanterite and sulphuric acid.

Dr. Conkin tells the story of discovering the Coral Ridge Member (New Providence Formation or Knobstone Group) of Jefferson County, Kentucky, USA in 1957 and the pyrite fossil fauna there in his 2006 paleontological memoir "I SEE... WONDERFUL THINGS" on pages 101-103. He describes the area as "a frozen paradise of former life."  The book contains a bittersweet story about what happened to the third paratype specimen as a squirrel mistook it for a nut.

This is a very interesting book filled with images of fossils and stories of how they were found throughout his long career.  The locations range from China to throughout the United States (e.g. Kentucky, Indiana, Tennessee, Texas).

Dr. Conkin also found another new species of this blastoid named Orbitremites coralridgensis.  The holotype (USNM PAL 127324) can be seen at the Smithsonian collection web site: CLICK HERE. Note the genus may now be known as Globoblastus.

Copies of this unique book might still be obtained from Hycliffe Publishing, LLC

P.O. Box 7434
Louisville, KY 40207-0434
TELEPHONE: (502) 895-4658
E-mail me at louisvillefossils@gmail.com if you need help getting in contact with them.

worldcat.org lists two copies available at libraries in the University of Iowa and Tulsa, Oklahoma: CLICK HERE

Thanks to Dr. Conkin for letting me photograph this fossil specimen.  Note fossil has been coated to help prevent marcasite breakdown.