Below Jamie’s Knob
Mortar Count: 4
Open
Green Valley Creek
Mortar Count: 2
Open
Jamie’s Knob
Mortar Count: 13
Open
Joel’s Rockspring Cave
Mortar Count: 2
Open
Macedo Ranch
Mortar Count: 4
Open
Pine Canyon #1
Mortar Count: 2
Open
Pine Canyon #2
Mortar Count: 1
Open
Tao House Grooved Rock

Territory: Tatcan

The Tatcan were a Bay Miwok triblet that held the upper Walnut Creek watershed. The Tatcans controlled Bollinger, Sycamore, and Green Valley Creeks. They also controlled the upper part of Pine Creek. Most of Las Trampas Ridge was in their hands, as were some of the western foothills of the Black Hills.

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Below Jamie’s Knob

Below Jamie’s KnobFour bedrock mortars and several possible mortars.Elevation 329 ft.Thanks to our master site finder spotting these beautiful mortars.This outcrop is right in the creek bed. Water was ponding up about 10 yards away on the last day of August 2014. The Indians knew where all the reliable water sources were located.A closeup of […]

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Green Valley Creek

Green Valley Creek2 bedrock mortars in Green Valley CreekElevation 380 ft.Thank you Rick Hicks.Bob admires the mortars in the creek behind the Fresh and Easy market on Diablo Road. Although it’s the day after small rain storm, there’s an unaccountable amount of water in Green Valley Creek for late October in a drought year.The closely […]

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Jamie’s Knob

Jamie’s Knob13 bedrock mortars.Elevation 445 ft.Thanks to Jaime for turning us on to this great site. It’s just a short 20 minute walk from the end of Snyder Lane. When you go through the gate onto park land take the left-hand, single-track trail. This path conveys you to a private drive bordered by a public […]

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Joel’s Rockspring Cave

Joel’s Rockspring CaveTwo bedrock mortars in a rock shelter overlooking a seasonal creek.Elevation 467 ft.Joel discovered this very cool rock shelter not far from the Rockspring Place trail head in Walnut Creek’s Shell Ridge Open Space. The cave can be reached by an easy hike and would be a great place to hang out with […]

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Macedo Ranch

Macedo Ranch4 bedrocks in the saddle of the “China Wall”.1 bedrock mortar and a grinding slick on ridge top above.This site is very near the Volvon/Tatcan tribelet boundary.Bob and Jim approach the China Wall.There are some surprisingly deep bedrock mortars here.A closeup of the deepest mortar. We call mortars with interiors like this “bullet-shaped.”

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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.

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Pine Canyon #2

Pine Canyon #2One bedrock mortar in a charming creekside setting below Castle Rock.Elevation 489 ft.Thanks to Richard for conducting us to this site and leading us through the “back door” to Castle Rock.Bob and Richard examine the mortar.A closeup of the mortar.

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Tao House Grooved Rock

Tao House Grooved RockThis site is named for Eugene O’Neill’s nearby Tao House–a National Historic site.This rock sits all by itself in the middle of a big field on the side of Las Trampas Ridge. Across the San Ramon Valley to the east looms Mt. Diablo. The grooves in the rock are straight and of […]