First described by Norwood and Preatten in 1855, Shansiella carbonaria is a very common fossil gastropod. The species has been found from 306.95 until 295 million years ago. The genus Shansiella, first described by Yin in 1932, existed from 360.7 until 254 million years ago. The genus described after the species is confusing. However, the species was originally named Pleurotomaria carbonaria. Later it moved to the newer genus Shansiella in 1932.
This specimen is from the Ford City Pine Creek Limestone. These weather out with beautiful shell patterns visible at that location. The shale/limestone layer they are embedded in is very fissile, being able to be split quite easily. In comparison to the more cement like Brush Creek limestone, this is an easy matrix to work.
In the photo above, the growth lines are visible on the right side. The aperture, or shell opening, is to the left.
Shansiella carbonaria on the web
- Pine Creek Gastropods – From an earlier trip