"Other parts of the initiation rites involved isolation in a warmed pit for three days, thereby mimicking the ritual isolation and immobility practiced at childbirth; the ingestion of tobacco and resulting receipt of a supernatural vision; and apparently at the culmination of the initiation, the painting of the designs representing the spirit received during the girl's altered state." (David S. Whitley)
A slightly different take on the last part of the initiation follows:
"The final event of the Indian puberty celebration consisted of a race, called a "hayie," to a certain rock where a relative of each girl awaited her with a little pot of red ochre paint. On arrival, each initiate painted a design on the rock. Indian informants indicated that these designs were always diamond-shaped and represented the rattlesnake." (Dolcie H. Vuncannon)
Once the initiates had completed these rites, they were considered women.
A photo of the "pictograph rock" You can see part of the fence around it also
The same photo enhanced by DStretch
A closer view of the symbols
Same image after DStretch - Notice that all the patterns described above are present here
Included just because I liked it
Earlier posts to similar pictograph sites:
Female puberty initiation site in Joshua Tree National Park
Female puberty initiation site (possible) in Joshua Tree National Park
Female puberty initiation site in Anza-Borrego Desert State Park
.