Showcases the wealth of new research on sacred imagery found in twelve states and four Canadian provincesIn archaeology, rock-art—any long-lasting marking made on a natural surface—is similar to material culture (pottery and tools) because it provides a record of human activity and ideology at that site. Petroglyphs, pictographs, and dendroglyphs (tree carvings) have been discovered and recorded throughout the eastern woodlands of North America on boulders...

In Hidden Thunder, renowned watercolor artist Geri Schrab and archaeologist Robert "Ernie" Boszhardt give readers an up-close-and-personal look at rock art. With an eye toward preservation, Schrab and Boszhardt take you with them as they research, document, and interpret at the ancient petroglyphs and pictographs made my Native Americans in past millennia. In addition to publicly accessible sites such as Wisconsin’s Roche-a-Cri State Park and Minnesota’s Jeffers Petroglyphs, H...