The north Atlantic group is in the priscan habitat of the tribes of the Algonquian linguistic family, and extends from Nova Scotia southward to Pennsylvania, where the sculpturings are frequent, especially on the Susquehanna, Monongahela, and Alleghany rivers, and across Ohio from Lake Erie to the Kanawha river, in West Virginia. Isolated localities bearing the same type are found westward on the Mississippi river and a few of its western tributaries, to and including the Wind river mountains, in Wyoming, the former habitat of the Blackfeet Indians. All of these petroglyphs present typical characters, sometimes undefined and complicated. From their presumed authors, they have been termed the Algonquian type. Upon close study and comparison they show many features in common which are absent in extra-limital areas.
Immediately south of the Kanawha river, in West Virginia, and extending southward into Virginia, Tennessee, and North Carolina, the pecked or sculptured petroglyphs are replaced by painted figures of a style differing from the Algonquian. These are in the area usually designated as Cherokee territory, but there is no evidence that they are the work of that tribe; indeed, there is no indication of their authorship. The absence of pecked characters in this area is certainly not due to an absence of convenient material upon which to record them as the country is as well adapted to the mode of incision as is the northern Atlantic area.
Upon the Pacific slope a few pecked as well as colored petroglyphs occur scattered irregularly throughout the extreme northern area west of the Sierra Nevada, but on the eastern side of that range of mountains petroglyphs appear in Idaho, which have analogues extending south to New Mexico and Arizona, with remarkable groups at intervals between these extremes. All of these show sufficient similarity of form to be considered as belonging to a type which is here designated “Shoshonean.” Tribes of that linguistic family still occupy, and for a long time have occupied, that territory. Most of this Shoshonean group consists of pecked or incised characters, though in the southern area unsculptured paintings predominate.
On the western side of the Sierra Nevada, from Visalia southward, at Tulare agency, and thence westward and southward along the Santa Barbara coast, are other groups of colored petroglyphs showing typical features resembling the Shoshonean. This resemblance may be merely accidental, but it is well known that there was intercourse between the tribes on the two sides of the Sierra Nevada, and the Shoshonean family is also represented on the Pacific slope south of the mountain range extending from San Bernardino west to Point Conception. In this manner the artistic delineation of the Santa Barbara tribes may have been influenced by contact with others.