These brachiopods are the Onniella (Dalmanella) quadrata of the Maquoketa Group of Eldorado, Iowa.  The animals lived in the Late Ordovi...

Snail fossils found in the Maquoketa formation of Eldorado, Iowa. This small snails crept the sea floor in the late Ordovician period.  T...

Fossils, Rocks & Akiko from The Field Museum on Vimeo . The Field Museum of Chicago, Illinois has released a video (about 2 minutes...