Near the top of Hog CanyonPossible bowl Metate with 3 bedrock mortarsThis is either a bowl metate, a rarity in these parts, or what Ernest Johnson in “The Stone Mortars of Contra Costa County” would classify as a type “C3” mortar. Johnson says “Type [C3], which resembles a deeply worn metate, is a true mortar, […]
Silva Creek Cave1 bedrock mortar in a rock shelter; a possible basin metate.Elevation 713 ft.Bob stands at the mouth of the cave. There’s plenty of room inside and comfortable sleeping areas.This beautiful cone-shaped mortar sits right in the middle of an ergonomically contoured rock slab.We believe the trinomial for this site is CA-CCO-6.
Upper Pond Village Creek10 bedrock mortars and 10 cupules.Elevation 1888 ft.This site sits beside the creek that flows down to the Pond Village. One of the mortars here is on a nice, flat slab in the creekbed.All ten cupules are on this rock, although it’s hard to make them out in this picture. Two are […]
Hematite Processing Site12 bedrock mortars at Holy Names College.Hematite was processed and quarried here. It was often burned, which produced brighter reds, and then leached to remove salts and soften the rock. After that it was ground to a powder.Closeup of a chunk of hematite. Subtle processing differences produced different hues of red ochre.This may […]
Los Meganos State Historic Park2 bedrock mortars and two anvilsElevation 230 ft.These mortars sit near Briones Creek in the hills behind John Marsh’s house. We wouldn’t have looked for mortars or even hiked here if Joel had not made an initial reconnaissance of this area.Bob looks toward the mountain and its subsidiary peaks. The Briones […]
Mallory Creek #3Near the confluence of Mallory and Kellogg Creeks.10 bedrock mortars and an 8 cupule rock in the creek.Elevation 495 ft.Portions of this site may be inundated by the new high water level of Los Vaqueros Reservoir.Kellog Creek flows below us on its meander to the Delta, but instead of flowing steadily downward through […]
North Morgan Territory Ridge2 bedrock mortars and 4 or 5 bowls near the head of a watercourse. Probable housepits.Elevation 2112 ft.A bedrock mortar adjacent to one of the probable housepits.A big bowl.A bowl with a “fishtail” in the rim, a feature we’ve encountered at several sites in Volvon territory.Photograph by Bob Bardell.We believe the trinomial […]
Upper San Leandro Reservoir8 bedrock mortars, 3-5 cupules. Site may be underwater.This is a beautiful spot now because of the Upper San Leandro Reservoir, but it was probably nice in Jalquin times too. Back then these mortars were on a little hillside terrace above Kaiser Creek, a perennial watercourse. How many mortars here and how […]