Nereidavus invisibilis? Scolecodont

This fossil appears to be a Nereidavus invisibilis? scolecodont found in the Silurian Waldron Shale of Clark County, Indiana, USA.  The fossil was found on top of another fossil as can be seen in the second picture.  The second fossil is a crinoid holdfast.

Thanks to Kenny for the pictures and identification.  See other possible scolecodonts found in the Waldron Shale: CLICK HERE and CLICK HERE.

Wikipedia has pictures of the modern sandworm Alitta virens (old genus name Nereis): CLICK HERE

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.