ALA-481
Mortar Count: 2
Open
Alvarado Park
Mortar Count: 2
Open
Black Hills Trail
Mortar Count: 3
Open
Camp Confluence
Mortar Count: 1
Open
Canyon Trail Park Petroglyph Boulder CA-CCO-152
Mortar Count: 20
Open
Chitactac
Mortar Count: 75
Open
First Terrace
Mortar Count: 31
Open
Lower Volvon Village
Mortar Count: 200
Open
Lynch Canyon Rancher Petroglyph Rock
Mortar Count: 13
Open
Mira Vista Park
Mortar Count: 10
Open
Monte Bello Open Space–headwaters of Stevens Creek
Mortar Count: 12
Open
Ring Mountain #2
San Marin
Stromer Spring
Mortar Count: 25
Open
Sulphur Spring
Mortar Count: 5
Open
Upper Crow Creek
Mortar Count: 3
Open

Feature: Petroglyphs

1stTerraceCupuleRock

First Terrace

First Terrace31 bedrock mortars, a 23 cupule rock, and 3-4 housepits.Elevation 775 ft.This site and the Kitchen site are actually on the same terrace, separated by a creekbed, but because we discovered and named the Kitchen site first, we called this site the “First Terrace.”A view of the First Terrace. The cupule rock is near […]

LowerVillageNipple

Lower Volvon Village

Lower Volvon Village200 bedrock mortars and a 32 cupule rock. A second cupule rock also at the site. Numerous housepits.Elevation 1445 ft.This is one of the largest collections of bedrock mortars in California, and it is only about a mile and a half away from the main Volvon Village.The Lower Village sits on the side […]

LCYN5

Lynch Canyon Rancher Petroglyph Rock

Lynch Canyon Rancher Petroglyph Rock13 bedrock mortars and modern petroglyphs on two rocksElevation 539 ft.This camp sits near the headwaters of the North Fork of Lynch Creek.A large petroglyph panel may be found on this mortar rock.A closer look at the mortars.A nice workstation. Note the layout of the mortars and their size differences.Photograph by […]

MiraVistaPark2

Mira Vista Park

Mira Vista Park10 bedrock mortars and 60+ cupules on a chlorite blueschist boulder near Baxter Creek.Elevation 116 ft.See Canyon Trail Petroglyphs for more details about cupule petroglyphs. Also 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). […]

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. […]

ALA-481-1

ALA-481

ALA-4812 shallow bedrock mortarsElevation 655 ft.We finally discovered this site after years of looking for it. The mortars are on separate rocks near the creek. We know there’s a circle-within-a-circle petroglyph here somewhere, so we’ll be back..

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 […]

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 […]

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 […]

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.