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Bedrock Mortars. Mortar holes like these are found in boulders and bedrock outcrops throughout the Los Vaqueros Project area. Stone pestles were used to grind acorns in the mortars.Scattered oaks and even some groves of trees would have provided the staple acorn, which was pounded in the bedrock mortars (“Indian grinding rocks”) found across the Los Vaqueros landscape. Tiny nutritious grass seeds collected by the thousands from the open fields could also be processed there. Created in RealityCapture by Capturing Reality from 52 images in 00h:06m:35s.