Note XII-18 — Chapter XII · ANTIQUITIES OF THE NORTHWEST.
Reading edition
1, Black lava, 40 feet; 2, gravel, 3 feet; 3, light lava, 30 feet; 4, gravel, 5 feet; 5, light lava, 15 feet; 6, gravel, 25 feet; 7, dark brown lava, 9 feet; 8, (in which the skull was found) gravel, 5 feet; 9, red lava, 4 feet; 10, red gravel, 17 feet. Cal. Acad. Nat. Sciences, vol. iii., pp. 277-8. 'This skull, admitting its authenticity, carries back the advent of man to the Pliocene Epoch, and is therefore older than the stone implements of the drift-gravel of Abbeville and Amiens, or the relics furnished by the cave-dirt of Belgium and France.' Foster's Pre-Hist. Races, pp. 52-4.