Volvon Village on Mallory Creek
Mortar Count: 715
Open
Upper Welch Creek Road
Mortar Count: 5
Open
West Ohlone Rocky Ridge
Mortar Count: 17
Open
ALA-60 at Crow Canyon Road and Castro Valley Boulevard
Mortar Count: 44
Open
Wildcat Creek Cupule Rock
Alvarado Park
Mortar Count: 2
Open
Williams Gulch
Mortar Count: 2
Open
Blue Oak Trail
Mortar Count: 16
Open
Briggs Creek below Alma College
Mortar Count: 25
Open
Canada del Cierbo
Mortar Count: 28
Open
Canyon Milling site
Mortar Count: 29
Open
Canyon Trail Park Petroglyph Boulder CA-CCO-152
Mortar Count: 20
Open
Chinese Tree of Heaven
Mortar Count: 18
Open
Diablo Grande Cave
Mortar Count: 9
Open
Don Edwards Preserve
Mortar Count: 4
Open
Elephant Rock
Mortar Count: 1
Open
Evergreen Valley Cupule Rock on Silver Creek
First Terrace
Mortar Count: 31
Open
Gossip Rock
Mortar Count: 5
Open
Lake Del Valle, Campsite 74
Mortar Count: 1
Open
Los Vaqueros Log Cabin Village
Mortar Count: 60
Open
Lower Volvon Village
Mortar Count: 200
Open
Lynch Canyon Village
Mortar Count: 51
Open
Mallory Creek Village
Mortar Count: 45
Open
Manhattan Trail–Black Diamond Mines
Mortar Count: 1
Open
Manzanita berry grinding slick with one cupule
Mid-Walpert Village
Mortar Count: 32
Open
Mira Vista Park
Mortar Count: 10
Open
Monte Bello Open Space–headwaters of Stevens Creek
Mortar Count: 12
Open
Pena-Vaca Adobe
Mortar Count: 20
Open
Pine Canyon #1
Mortar Count: 2
Open
Rock City
Mortar Count: 13
Open
Round Valley Village
Mortar Count: 317
Open
Silva/Kellogg Lower
Mortar Count: 2
Open
Stone Corral
Mortar Count: 33
Open
Stromer Spring
Mortar Count: 25
Open
Tolenas Springs Village
Mortar Count: 41
Open
Upper Pond Village Creek
Mortar Count: 10
Open
Upper San Leandro Reservoir
Mortar Count: 8
Open

Feature: Cupules

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. […]

DiabloGrandeCave

Diablo Grande Cave

Diablo Grande Cave1 bedrock mortar and a 28 cupule slab8 bedrock mortars in a cave with (obscure) hematite pictographsElevation 1179 ft.Jim photographs the cupule rock. The cupules are hard to make out, so look carefully. That’s the cave (or rock shelter) with bedrock mortars in the background.

PenaVaca3

Pena-Vaca Adobe

Pena-Vaca Adobe11 bedrock mortars and at least 9 portable mortarsElevation 179 ft.The original adobe dates from 1842.The low wall here partially encloses a burial ground.A diverse set of mortars. Lots of cupules/anvils too.A pretty setting near the Indian Council Grounds.

DonEdwardsBoulder

Don Edwards Preserve

Don Edwards Preserve4 bedrock mortars, possible cupulesElevation 103 ft.Another one of Jeff’s amazing finds.Nearly all the bedrock mortars we’ve encountered in the Bay Area occur on sandstone. These are the only ones we’ve seen in metamorphic chert.A closer look. Note the paired, shallow mortars. Such arrangements are rare. The only others we’ve seen are on […]

PineCreek

Pine Canyon #1

Pine Canyon #12 bedrock mortars, 2 cupules, and an incised rock at the Intersection of Castle Rock and Stage Road Trails.Mortar and pestle.

Elephant-Rock

Elephant Rock

Elephant RockOne bedrock mortar, cupules, and carved graffiti.Elephant Rock may have been a “prayer” site. 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).Home of the Elephant Rock.

RockCity

Rock City

Rock City13 bedrock mortars, grinding slick, cupules, and incisions.There are deep, well-worn mortars here.Another view.

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 […]

RoundValley5

Round Valley Village

Round Valley Village317+ bedrock mortars, two cupule rocks, and a stacked rock enclosure.CA-CCO-320This settlement is the largest of three that sit along the eastern base of the Black Hills.Joseph Chartkoff in “A Rock Feature Complex from Northwestern California,” American Antiquity, Vol. 48, No. 4, (Oct., 1983), pp. 745-760, notes the similarity between this stacked-rock enclosure […]