Natural formation (Material Keyword)

DOCUMENT Full-Text John Ruskamp.

Located above the Little Colorado River in east-central Arizona, a natural rock formation casts a dynamic shadow-line onto a panel of ancient rock art during the summer solstice. Two hours later a rock chimney allows a narrow beam of sunlight to pass through, forming a Sun Dagger that illuminates the petroglyphs beneath it in a dynamic manner, similar to the solar marker located upon Fajada Butte in Chaco Canyon. Although this solar marker is considerably older than the one on Fajada Butte, here...