Thunderbird Being
"Painting and engraving of rock are some of the oldest surviving forms of human expression.. This expression is a worldwide phenomenon with tens of thousands of sites on six continents. The images in different regions are distinctive with characteristic styles, subjects, and methods of execution.
Rock art, a generic term used by researchers that is applied to rock engravings and rock paintings and drawings, is broadly described in two categories: 1) rock paintings and drawings, jointly referred to as pictographs; and 2) rock engravings, often referred to as petroglyphs.
Drawings were inscribed or chalked onto rock while paintings were made by applying wet pigments. Pictographs, which were produced by an additive process, survive today in caves, rock shelters, or exposed rock surfaces where the images are partly protected from weathering.
Petroglyphs were created on rock surfaces by a subtractive process; the rock may be pecked, hammered, or abraded. Images surviving at the Jeffers site were all created using a pecking method to form both outline and infilled figures."
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