. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. Bulletin, So. Calif. Academy of Sciences Vol. 46, Part 3, 1947. PLATE 34 A clump of matrix asphalt trom McKittrick asphalt field, S'ite 4, depth 4 ft., showing in center Hemipterous wing, dragon fly bodies and beetles, at left dragon fly head, at right large beetle head. 150 ft., Site 8 200 ft., Site 9 250 ft., and Site 10 300 ft. south of Site 4. The diagonal height of the 45° slopes was: Site 4 12 ft., Site 5 16 ft., Site 6 18 ft., Site 7 44 ft., Site 8 32 ft., Site 9 40 Site 10 55 ft.
. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. Bulletin, So. Calif. Academy of Sciences Vol. 46, Part 3, 1947. PLATE 34 A clump of matrix asphalt trom McKittrick asphalt field, S'ite 4, depth 4 ft., showing in center Hemipterous wing, dragon fly bodies and beetles, at left dragon fly head, at right large beetle head. 150 ft., Site 8 200 ft., Site 9 250 ft., and Site 10 300 ft. south of Site 4. The diagonal height of the 45° slopes was: Site 4 12 ft., Site 5 16 ft., Site 6 18 ft., Site 7 44 ft., Site 8 32 ft., Site 9 40 Site 10 55 ft. The asphalt lies in definite strata which have about a 2° slope, although some levels are irregular. The top layer of very black asphalt at Sites 3, 4 was 28 inches thick, and it began at the sur- face near Site 5. Below this was a brown tar-filled zone of con- siderable depth, which at all exposures was rich in insect ma- terial. Below this was a blacker zone down to 100 inches at Site 4, 60 inches at Site 5, 48 inches at Site 6, and at the surface of Site 7. Sites 8, 9, and 10 showed only oil sands of even texture, prob- ably not surface exposed; at Site 9 there was a recent flow over the matrix. Samples were taken at every 6 inches vertical depth at Site 4; at every foot depth at Site 5 ; and a few samples at Sites 6, 7, and 10. Then 33 feet south of Site 4 a cleavage indicated good ma- terial, so this was called Site 11, and a sample taken in the same level as the 30 inch at Site 4. 139. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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