Rare, 1.5" Carboniferous Horseshoe Crab (Euproops) - England

This is a rare, Upper Carboniferous Xiphosuran (Horseshoe Crab) from England. The ancestry of modern day horseshoe crabs (Limulus) can be traced all the way back to the Cambrian. It was collected from a quarry in Lancashire, England which is no longer accessible as it is now a landfill pit.