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 […]
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 […]
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 […]
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.
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 […]
West Ohlone Rocky Ridge17 bedrock mortars and 20 cupulesElevation 1958 ft.Thank you Jeff! Another great discovery. We passed within 50 yards of this site at least three times without noticing it.Bob heads toward the site. There are mortars in that pile of rocks straight ahead of him down the hill.A fine example of a rock […]
East Goat Rock Camp4 bedrock mortars and a probable housepitElevation 1451 ft.We’d hiked around and through this area a number of times, but it took Jeff’s sharp eyes to find this beautiful site. A picturesque seasonal creek flows nearby in a rocky channel.Looking over the main mortar rock toward Alameda Creek. A protected basin lies […]