Petroglyphs (also called rock engravings) are pictogram and logogram images created by removing part of a rock surface by incising, picking, carving, and abrading. Outside North America, scholars often use terms such as "carving", "engraving", or other descriptions of the technique to refer to such images. Petroglyphs are found world-wide, and are often associated with prehistoric peoples. The word comes from the Greek words petro-, theme of the word "petra" meaning "stone", and glyphein meaning "to carve", and was originally coined in French as petroglyphe.

'Little Horny Man': Rock Carving of Giant Phallus Discovered   Live Science - February 22, 2012
A stick figure man with a giant phallus dubbed "the little horny man" by its discoverers is the oldest rock carving found yet in the Americas, researchers say. These findings might shed new light on when the New World was first settled, scientists added. The time frame during which humans first reached the Americas remains hotly debated. One key to settling this controversy would involve uncovering early examples of human artifacts, such as art. Scientists discovered one ancient sample of such art in a cave named Lapa do Santo in central-eastern Brazil. The region is home to Luzia, the oldest human skeleton found to date in South America.

Petroglyphs

Interesting Petroglyphs from around the world that often depict a theme about creation replete with clues about the journey of humanity. They are often associated with Ancient Aliens and Fertility Gods and Goddesses.

Min - Egyptian God of Fertility

Paleontology - Phallus