Dating turritella fossil
The shells are quite frequently found as fossils, and the carbonate stone made from large quantities of Turritella shells is often referred to as "Turritella limestone", or, if silicified, "Turritella agate".
Several other names, however, have been used, most of them based either on the locality from which the rock came or someone's idea of a term that might increase sales of anything made from the rock.It has been polished to bring out the fossils which show up white in the black matrix. $13.50 Each These turritella fossils are agatized coquinite of the Green River Formation.This piece is 3 1/2 inches long by 1 1/2 inches wide and about one inch thick.The rock in which these snail shells are so abundant varies from a soft sandstone to a dense chalcedony.This dense silicified rock is popular with gem and mineral hobbyists, as well as with New Age practitioners.Turritella Fossils St Mary's Formation These turritella fossils are free of their matrix. $23.50 Each Turritella Fossils Agatized Green River B These turritella fossils are agatized coquinite of the Green River Formation.
This piece measures 2 1/2 inches by 2 inches and is about an inch thick.
The fossils are from the Eocene Epoch, and are about 38 to 54 million years old. You can see in the picture several turritellas exposed.
What you cannot see is that this rock is composed almost entirely of turritella shells! They are from the Miocene Epoch and are about 8 million years old. Your turritella will be very similar to those pictured here.
They have tightly coiled shells, whose overall shape is basically that of an elongated cone.
The name Turritella comes from the Latin word turritus meaning "turreted" or "towered" and the diminutive suffix -ella.
Because each of these gemrocks is so-to-speak unique, descriptions, noteworthy localities, etc.