The top image is a nodule containing a calymenid trilobite fossil. The bottom images show the extracted fossil (right) and the natural mold it left behind in the counterpart section of the nodule (left).
Photo credit: Thomas Bresson
The top image is a nodule containing a calymenid trilobite fossil. The bottom images show the extracted fossil (right) and the natural mold it left behind in the counterpart section of the nodule (left).
Photo credit: Thomas Bresson