Alvarado Park
Mortar Count: 2
Open
Black Hills Trail
Mortar Count: 3
Open
Evergreen Valley Cupule Rock on Silver Creek
Monte Bello Open Space–headwaters of Stevens Creek
Mortar Count: 12
Open
Possible PCN
Ring Mountain
Ring Mountain #2
San Marin
Stromer Spring
Mortar Count: 25
Open
Upper Crow Creek
Mortar Count: 3
Open

Feature: PCN

BPPCN

Possible PCN

Possible PCNElevation 1045 ft.Most pecked, curvilinear, nucleated rock art elements we’ve encountered occur on schist. This one, if it is one, occurs on sandstone.Heather and Jim inspect the possible PCN. Near this rock lies another flat-topped rock with several large, shallow basins on it..

RingMountain

Ring Mountain

Ring MountainMultiple PCNsA PCN is created by pecking a circular or oval groove in a rock (typically schist in the Bay Area) leaving a raised “nucleated” center that may itself be subject to further manipulation.For an in-depth study of PCNs see Donna Gillette’s 2011 dissertation Cultural Markers on the Landscape: the PCN Pecked Curvilinear Nucleated […]

RingM1

Ring Mountain #2

Ring Mountain #2Multiple PCNs and fantastic viewsElevation 488 ft.Thanks to Danielle for getting us back out to Ring Mountain.A PCN is created by pecking a circular or oval groove in a rock (typically schist in the Bay Area) leaving a raised “nucleated” center that may itself be subject to further manipulation.For an in-depth study of […]

SanMartinPCNs1

San Marin

San MarinMultiple PCNsElevation 174 ft.A form of rock art known as the pecked curvilinear mucleated (PCN) petroglyph survives in a number of North Bay locations and can be found throughout the Coast Range mountains from the Oregon border to Santa Barbara.For an in-depth study of PCNs see Donna Gillette’s 2011 dissertation Cultural Markers on the […]

StromerSpring

Stromer Spring

Stromer Spring25 bedrock mortars, cupules, and PCN-style petroglyphsElevation 2023 ft.We used to drink from Stromer Spring in the not-so-distant past. The Park District warns against doing it now.A nice, single-track trail passes near here. We followed it many times without ever stopping to examine these rocks. If we considered them at all, we dismissed them […]

CrowCreekPCN

Upper Crow Creek

Upper Crow Creek3 bedrock mortars and a PCN.This sure looks like a Pecked Curvilinear Nucleated petroglyph to us. If it is, does that mean this site had some special significance?

AlvaradoPark2

Alvarado Park

Alvarado Park2 bedrock mortars, 275+ cupules, 2 PCNs, and midden behind gazebo.This chlorite blueschist outcropping on Wildcat Creek has more cupules on it than any other we know of in the Bay Area. Was it just the blueschist found here and on Baxter Creek that attracted cuple-makers, or was something else at work?Jim and Heather […]

Black-Hills-Trail-Possible-PCN

Black Hills Trail

Black Hills Trail.Three bedrock mortars, a possible PCN, and a slick.Elevation 1520 ft.Pecked curvilinear nucleated petroglyphs are not supposed to occur in Contra Costa County.We’re not so sure.

EVC1

Evergreen Valley Cupule Rock on Silver Creek

Evergreen Valley Cupule Rock on Silver Creek32+ cupulesElevation 570 ft.Thanks to Joel for directing us here.The rock.Some of the cupules on this rock could probably be classed as bedrock mortars.We believe the trinomial for this site is CA-SCL-63. There are PCNs on this rock too, but we didn’t notice any. See A Stylistic Analysis of […]

MBOS5

Monte Bello Open Space–headwaters of Stevens Creek

Monte Bello Open Space–headwaters of Stevens Creek12 bedrock mortars and 34+ cupules, 14 on one rock and 20 on anotherElevation 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. […]