Silurian period brachiopods that I have not identified with embedded pyrite crystals.  Last two images should have been stacked plus sti...

Rhynchotreta cuneata This post includes pictures of 19 different species of brachiopods found in the Waldron Shale of Clark County, Indi...

In the past, pictures have been presented of the Orthospirifer and Athyris with exposed lophophores.  This image is one of the few with...