Monte Bello Open Space–headwaters of Stevens Creek
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Monte Bello Open Space–headwaters of Stevens Creek


Monte Bello Open Space–headwaters of Stevens Creek
12 bedrock mortars and 34+ cupules, 14 on one rock and 20 on another
Elevation 2240 ft.

Looking up at the site, another one of Joel’s South Bay discoveries.


There are 14 cupules on the rock in the center of the photo. The proximity of cupule rocks to water sources is well-documented. See: Cupule Petroglyphs in the Diablo Range by E. Breck Parkman in the Journal of California and Great Basin Anthropology Vol. 8, No. 2, pp. 254-55 (1986).


A partial view of the main mortar rock. We found at least 20 cupules on this rock.


The rock with two possible PCNs. It’s hard to make them out in this photo. One features a pecked elliptical groove with a bread-loaf-shaped nucleated center. The nucleated center of the other is also loaf-shaped, but the pecked groove is horseshoe-shaped–a possible vulva form.


For an in-depth study of PCNs see Donna Gillette’s 2011 dissertation Cultural Markers on the Landscape: the PCN Pecked Curvilinear Nucleated Tradition in the Northern Coastal Ranges of California.

A closeup view of the possible PCNs.


Photographs by Bob Bardell