It is probably a modern forgery, close to 1920, adding forged Fray Marcos de Niza signature to a partial reproduction of the inscription found on "Inscription Rock" at El Morro, New Mexico.
See: Katharine Bartlett and Harold S. Colton, "A Note on the Marcos de Niza inscription near Phoenix, Arizona" Plateau vol.12, n°4, April 1940, p.53-59.
See also: Dorn et al., "Assessing Early Spanish Explorer Routes Through Authentication of Rock Inscriptions" The Professional Geographer volume 64, issue 3, 2012.
The exact location this photograph was taken is available at: [1]
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== Summary == This photograph was taken at the Pima Canyon Trailhead at South Mountain in Phoenix. It was enscribed by Friar Marcos De Niza in his search for one of the lost cities of gold. The exact location this photograph was taken is available at: [ht