Griffithides sp. scale in cms CLASS - Trilobita ORDER - Ptychopariida FAMILY - Phillipsiidae GENUS/SPECIES - Griffithides sp. ROCK UNIT - Crawfordsville Formation AGE - Mississippian (330 million years old) LOCALITY - Crawfordsville, Indiana, USA Only a handful of trilobite families survived the large extinction event that occurred during the Late Devonian Period (about 365 million years ago) and only the family Phillipsiidae continued to the end of the Paleozoic Era (about 240 million years ago). The other trilobites in this drawer are also from this prolific Late Paleozoic family. PRI 41459