A photo of petroglyphs.
By Geology and Ecology of National Parks
June 1990 (approx.)
Detailed Description
Petroglyphs along the ancient shoreline of dry Tule Lake. The petroglyphs are obiviously younger than the high-standing lake levels of the last ice age that covered the rocks. However, carvings at different levels, and the abundance of carvings suggest that the site was visted by many generations (NPS, 2007; Swartz, 1978).
Sources/Usage
A photo of petroglyphs.