Turritella agate is from Wyoming. The proper name is Goniobasis, (pronounced gone-e-o-basis). The agatized fossil rough was misnamed many years ago, but the name turritella is still commonly used. The petrified agate or fossilized snails of turritella agate are colored ambered, golds or bluish in a gray black to dark brown matrix with the size of the fossil spiral snails up to 1 1/2" long. Size of the rough are from 1-15 pounds each. There may be some waste in this Eocene era (38-58 million years old) agate with areas not highly agatized. Slab turritella agate parallel with the flat lay of the snails to take advantage of the interesting shapes of these ancient gastropods that have been preserved by silica replacement. See turritella agate slabs for a slab sample. Turritella agate will make some very nice cabochons or tumble broken slabs or rough for unique tumbled stones.