4 housepits near Bear Gulch
9 Bedrock Mortars Near Sunol Regional Wilderness Interpretative Center
Mortar Count: 9
Open
Above Mission Peak Meadow
Mortar Count: 2
Open
Agua Caliente Creek
Mortar Count: 7
Open
Agua Caliente East
Mortar Count: 3
Open
ALA-60 at Crow Canyon Road and Castro Valley Boulevard
Mortar Count: 44
Open
Alameda/Calaveras Creek confluence
Mortar Count: 3
Open
Albany Hill
Mortar Count: 4
Open
Alpine Pond — Palo Alto
Mortar Count: 35
Open
Alvarado Park
Mortar Count: 2
Open
Alviso Adobe 38 cupule rock.
Below McClure Springs
Benica Quarry #1
Mortar Count: 5
Open
Benica Quarry #2
Mortar Count: 20
Open
Blue Rock Springs Park — North
Blue Rock Springs Park — South
Briggs Creek below Alma College
Mortar Count: 25
Open
Brushy Peak Loop Trail
Mortar Count: 6
Open
Buckeye Canyon Mound
Canada del Cierbo
Mortar Count: 28
Open
Canyon Middle School
Mortar Count: 8
Open
Canyon Trail Park Petroglyph Boulder CA-CCO-152
Mortar Count: 20
Open
Castle Rock Park Partridge Farm area
Mortar Count: 7
Open
Cave Camp
Mortar Count: 5
Open
Charcoal Road — Saratoga
Mortar Count: 16
Open
Chinese Tree of Heaven
Mortar Count: 18
Open
Chitactac
Mortar Count: 75
Open
Circle of Circles
Mortar Count: 1
Open
Club Moto
Mortar Count: 30
Open
Dillon Point
Mortar Count: 4
Open
Don Edwards Preserve
Mortar Count: 4
Open
East Goat Rock Camp
Mortar Count: 4
Open
El Sobrante La Honda
El Sobrante Library
Evergreen Valley Cupule Rock on Silver Creek
First Terrace
Mortar Count: 31
Open
Frick Lake
Mortar Count: 16
Open
Garin Park, east spur
Mortar Count: 2
Open
Garin, single morta
Mortar Count: 1
Open
Glen Cove Park, aka Sogorea Te
Mortar Count: 20
Open
Gossip Rock
Mortar Count: 5
Open
Guadalupe Oak Grove Park
Mortar Count: 4
Open
Hill 1424
Mortar Count: 4
Open
Horse Heaven Trail
Mortar Count: 3
Open
Jalquin Vista Park
Mortar Count: 16
Open
Jeff’s Hideaway
Mortar Count: 4
Open
Jeff’s Lookout
Mortar Count: 1
Open
Jeff’s Niles Canyon Mortar
Mortar Count: 1
Open
Jeff’s Pestles
Mortar Count: 1
Open
Joel’s Fat Lip Mortars
Mortar Count: 3
Open
Kitchen Site
Mortar Count: 22
Open
Lake Anza, east side
Mortar Count: 10
Open
Lake Del Valle, Campsite 40
Mortar Count: 2
Open
Lake Del Valle, Campsite 74
Mortar Count: 1
Open
Lexington Reservoir
Mortar Count: 27
Open
Mare Island shell midden
Mid Upper Welch Creek
Mortar Count: 1
Open
Mid-Walpert Village
Mortar Count: 32
Open
Miller’s Creek
Mortar Count: 3
Open
Minnis Ranch Rock
Mortar Count: 14
Open
Mira Vista Park
Mortar Count: 10
Open
Mission Creek Trail Spring
Mission San Jose
Monte Bello Open Space–headwaters of Stevens Creek
Mortar Count: 12
Open
Mt. Diablo Winter Solstice alignment
Murietta Falls
Mortar Count: 3
Open
North Knoll, Chinese Tree of Heaven
Mortar Count: 12
Open
North Mission Peak
North Vargas Plateau
Mortar Count: 2
Open
North Walpert Camp
Mortar Count: 2
Open
North Walpert Lookout
Mortar Count: 2
Open
Observation Hill
Patterson Mound, CA-ALA-328
Pinole Shores Shellmound
Possible PCN
Post Office Rock
Mortar Count: 12
Open
Rancho Higuera
Mortar Count: 2
Open
Rankin Park Overlook
Mortar Count: 1
Open
Reservoir
Mortar Count: 7
Open
Rock Scramble Jaca
Rockwall to Campsite
Mortar Count: 8
Open
Ryan’s Hideaway
Mortar Count: 24
Open
San Antonio Creek Rock
Mortar Count: 4
Open
Sanborn Creek Village — Saratoga
Mortar Count: 19
Open
Second Terrace
Mortar Count: 20
Open
Siippery Rock at Big Basin
Mortar Count: 8
Open
Siplichiquin Shell Mound
South Fork Apperson Creek
Mortar Count: 1
Open
South Mission Peak
South of Prayer Circle
Mortar Count: 1
Open
South Vargas Plateau
Mortar Count: 3
Open
Southern Rocky Ridge
Mortar Count: 14
Open
Stienstra’s Easy Chair
Mortar Count: 2
Open
Stonebrae, 16th hole
Mortar Count: 5
Open
Stromer Spring
Mortar Count: 25
Open
Sulphur Spring
Mortar Count: 5
Open
Sunol Ridge Prayer Circle
Sunol Ridge, North of Prayer Circle
Sunol Ridge, South of Prayer Circle
SW Walpert Ceremonial Site
Mortar Count: 22
Open
Swett Ranch
Mortar Count: 16
Open
The Old Homestead
Third Terrace
Mortar Count: 6
Open
Top ‘o Brushy Peak
Mortar Count: 1
Open
Turtle Rock – Solstice site.
Upper Crow Creek
Mortar Count: 3
Open
Upper Fetus
Mortar Count: 5
Open
Upper Lake at the Alma College site
Mortar Count: 2
Open
Upper Palomares Canyon
Mortar Count: 1
Open
Upper San Antonio Creek
Mortar Count: 2
Open
Upper Shady Canyon
Mortar Count: 1
Open
Upper Ukraina
Mortar Count: 29
Open
Upper Welch Creek Road
Mortar Count: 5
Open
Vernal Pool
Mortar Count: 23
Open
Walpert Ridge Lookout
Mortar Count: 19
Open
Welch-Hurst house
Mortar Count: 14
Open
West Ohlone Rocky Ridge
Mortar Count: 17
Open
Whittell Marsh Shellmound
Wildcat Creek
Mortar Count: 4
Open
Wildcat Creek Cupule Rock
Williams Gulch
Mortar Count: 2
Open
Windmill Overlook, Central
Mortar Count: 22
Open
Windmill Overlook, Lower
Mortar Count: 20
Open
Windmill Overlook, Upper
Mortar Count: 2
Open

Territory: Ohlone

Speakers of Ohlone dialects occupied the lands encompassed by Alameda, Santa Clara, Santa Cruz, San Mateo, and San Francisco Counties. One Ohlone triblet, the Carquin, occupied lands on the north shore of the Carquinez Strait in Solano County and probably in the southern part of Napa County.

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 […]

NormKidder1

Mission San Jose

Mission San JoseEstablished in 1797 at the Alson village of Oroysom.The mission complex as it appeared prior to its destruction in 1868 by the last great earthquake on the Hayward Fault.Image courtesy of the Bancroft Library.The church and museum at Mission San Jose are open from 10 AM to 5 PM daily except for New […]

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 […]

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 […]

GOGP4

Guadalupe Oak Grove Park

Guadalupe Oak Grove Park4 bedrock mortarsElevation 296 ft.A funnel-shaped mortar or a small cone with a broad flaring mouth? You make the call.Skeptical Bob runs his hand over the inner surface of this shallow concavity to determine whether if feels “worked.” It does.A shallow mortar.Photograph by Bob Bardell.The mortar on this rock may have started […]

PinoleShores1

Pinole Shores Shellmound

Pinole Shores ShellmoundElevation 16 ft.Dave turned us on to this mound. Keep up the good work Dave!Perhaps this mound is best described as a “shell heap”. It’s spread all over the top of the spit.We’ve identified Ostrea lurida (Olympia oyster), Mytilus californianus (California mussel), and Mytilus edulis (blue mussel) at this site.Photographs by Bob Bardell.

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?

CMS2

Canyon Middle School

Canyon Middle School8 bedrock mortars on two rocksElevation 302 ft.Thanks to Joel for discovering this charming site.One of the mortar rocks here sits near the edge of a steep cliff above Crow Canyon Road and the buried Crow Creek.There are beautifully proportioned mortars on this rock.Another beautiful mortar rock sits in a little meadow not […]

C401

Lake Del Valle, Campsite 40

Lake Del Valle, Campsite 402 bedrock mortars on a rock in the creek bedElevation 717 ft.Thanks to Joel and Alex for discovering this rock.

2ndTerrace1

Second Terrace

Second Terrace20 bedrock mortars; housepits.Elevation 880 ft.That’s another multiple mortar rock at the center of the photo.A closer view. Note the bell-shaped vegetation plug.A view over some of the mortar rocks here.Previous two photographs by Bob Bardell.