Below is the brachiopod Acanthothiris spinosa that was found at a quarry near Segenthal, Germany. I purchased it from Matthias Weissmueller's E-bay store. It has a number of round holes in the shell where hematite oolites once were. This is not uncommon for fossils found in certain layers at Segenthal.
Matthias collected and self prepped the fossil which comes from Jurassic aged rocks (Bajocian stage).