Mark Gary and Dan Foster in Mendocino County and Rock Art Conservation, Society for California Archaeology NEWSLETTER, Volume 24, Number 3, May 1990, show an image of the Keystone Petroglyph Boulder (MEN-2200), writing that it is:
"[P]erhaps the most complex boulder in the northwest coast region and also one of tremendous archeological significance ... [with analysis showing that] at least three distinctive "styles" are present, one superimposed upon the other."The basis for the underlying drawing of the megalithic stone boulder shown here is copyright by John Betts and we have used it as our basis to decipher that Keystone Petroglyph Boulder viz. Megalith as follows:
Decipherment of the Keystone Boulder of Mendocino County, California
as Representing Principally the Stars of Virgo ca. 500 B.C., but also showing stars of Corvus, Crater, Sextans, Hydra and Leo
The underlying drawing used as the basis for the decipherment is copyright by John Betts
though this is not the original drawing, but only an adaptation for which we make no warranty of correctness. Please consult the original drawing at the source cited above.
The decipherment is by Andis Kaulins, who is unaffiliated
and who has added the red marks and texts for purposes of explanation.
Using Starry Night Pro (http://astronomy.starrynight.com) as the background
The Stars Represented by the Cupmarks viz. Cupules and Lines
on the Keystone Boulder, Mendocino County, California
(explanatory red lines and circles added by Andis Kaulins,
who is not affiliated with Starry Night Pro)
Crystal clear, really.
There is little doubt about the general correctness of this particular decipherment. Perhaps some details may prove incorrect down the road, but the essential astronomical nature and the general sky area depicted are obvious.
THIS POSTING IS Posting Number 116 of
The Great Mound, Petroglyph and Painted Rock Art Journey of Native America
Keystone Petroglyph Boulder viz. Megalith, Mendocino County, California, Marks Principally the Stars of Virgo at the Autumn Equinox ca. 500 B.C.