A unprepared nothosaurus neural arch.  A small piece of the bone is in the counter plate and must be glued back on. 

 

 Location: Heilbronn
Epoch/Age: Triassic, "Oberer Muschelkalk, "Grenzbonebed",~ 235 Million years
Size of the stone: 15 × 16 cm
Size of the fossil (estimated) : 3 × 2,5 cm