mysterious carvings

The researchers also discovered that many pieces of quartzite were crushed around the slab Hendraburnick Quoit so that they sparkled in the dark.

Scientists have discovered the oldest rock carvings in North America dating back at least 10,000 years and are trying to decode them.

During excavation in Narigua, Coahuila state (Mexico), archaeologists discovered about 8,000 stone carvings, dating back over 6,000 years.