Echinoids: Archaeocidaris immanis (PRI 45520)3D Model
Fossil specimens of the echinoid Archaeocidaris immanis from the Pennsylvanian Winchell Limestone of Brown County, Texas (PRI 45520). Specimen is on display at the Museum of the Earth, Ithaca, New York. Longest dimension of rock is approximately 21 cm. Model by Emily Hauf.