A slab of Old Red Sandstone showing a early fossil Crossopterygian fish (Lobe fin fish) Osteolepis panderi. 380 Million Years Old. Devonian Period. Old Red Sandstone. Spittal Beds. Locality Caithness, Scotland, UK. The fossil fish shows lovely detail of body, tail fin,scales and skull ! See pics below! Fish measures approx 90mm. Slab measures 112mm x 48mm. Museum Quality! A Classic Scottish fossil!  The Crossopterygian fish (lobe fin fish) were on the same lineage as primitive amphibians as their fins later developed in to limbs !  More Pics Below !.....