This post is on recently found Silurian Period brachiopods from the Waldron Shale (also called Niagara Limestone), Clark County, Indiana. These first 3 pictures are probably of the Rhynchotrematidae cf. Stegerhynchus sp. or an Eospirifer eudora.
This next brachiopod appears to be the Meristella maria Hall(1863), also known as Meristina maria Hall(1867,1879).