https://www.usgs.gov/publications/conodonts-chappel-limestone-texas
Conodonts from the Chappel limestone of Texas | U.S. Geological Survey
The Chappel limestone of Early Mississippian (late Kinderhook and probably partly early Osage) age crops out in the Llano region of Texas where it is as much...
from thechappel limestoneof texasconodonts