How do archeologists use coins to date a site? Objective Learn how to interpret the markings on Spanish coins found at shipwrecked sites in order to practice relative dating. Background In 1705, a Spanish ship named La Galga wrecked off the coast of Virginia on its way to Spain from Havana, Cuba. In 1802, another ship, Juno, wrecked on its return to Spain from Veracruz, Mexico. Today, the shipwrecks lie off Assateague Island National Seashore. Students will use 3D replicas of coins associated with La Galga and Juno to learn relative dating, a method for dating sites that is important for arche Duration: 60 Minutes.