Cave decorated with Palaeolithic wall paintings, the first such to be discovered, in 1879. The paintings are realistic depictions of bison, deer, and horses in polychrome (several colours). The cave is near the village of Santillana del Mar in Santander province, northern Spain; other well-known Palaeolithic cave paintings are in Lascaux, southwestern France.
The arms show a Bible open at the Gospel of St John, a Trinitarian symbol. The white cross symbolizes faith. The arms appear on national and state flags. Effective date: 14 September 1863.