Waldron Shale Ostracod Fossil

Here is a picture of an ostracode microfossil found in the Waldron Shale of Clark County, Indiana, USA. It is about 420 million years old which puts it in the Silurian Period.

After looking at the paper entitled "A Study of the Ostracoda Fauna of the Waldron Shale, Flat Rock Creek, St. Paul, Indiana" by Horace Noble Coryell and Marjorie Williamson published by the The American Museum of Natural History (New York City, Number 870) on July 6, 1936, it appears to be some sort of Cornulina sp.  See their paper here: WEB LINK.

Thanks to Kenny for the picture.

Waldron Shale Scolecodont Fragment

This picture is of a microfossil called a scolecondont (part of a worm jaw). It was found in the Waldron Shale of Clark County, Indiana, USA. The age is around 420 million years old which would place it in the Silurian Period.

It reminds me of a Silurian scolecodont found in Sweden called Kettnerites sp.  Also one found in New York called Nereidavus invisibilis. I have not been able to find much research on the ones found in the American Waldron Shale though.

Thanks to Kenny for the picture.

Harpacodus Pentalodont Fossil Tooth

Here are some images of the Harpacodus dentatus? petalodont fossil tooth. It was found in the Big Clifty Formation of the Indiana Springs Shale Member of Crawford County, Indiana, USA. The creature existed in the Mississippian Period.

See another example of one at the Indiana State Museum web site HERE.

Thanks to Mark for showing me this fossil.