. Bulletin. Science; Natural history; Natural history. Fig. 3. General terrace deposited pebble shapes and measurements relative to Maximum Projec- tion Sphercities (i//p). a) andesite cobble approaching prolateness from site TS-5, L = mm, I = mm, S = 53 mm, with a ijjp of ; b) oblate andesite cobble from site TS-6, L = mm, I = mm, S = 52 mm with a t//p of ; c) oblate dacite pebble from site TS-4, L = 86 mm, I = 77 mm, S = 30 mm with a t//p of ; d) oblate andesite cobble from site TS-5, L = mm, I = 68 mm, S = mm with a \\ip of ; e) oblate andesi
. Bulletin. Science; Natural history; Natural history. Fig. 3. General terrace deposited pebble shapes and measurements relative to Maximum Projec- tion Sphercities (i//p). a) andesite cobble approaching prolateness from site TS-5, L = mm, I = mm, S = 53 mm, with a ijjp of ; b) oblate andesite cobble from site TS-6, L = mm, I = mm, S = 52 mm with a t//p of ; c) oblate dacite pebble from site TS-4, L = 86 mm, I = 77 mm, S = 30 mm with a t//p of ; d) oblate andesite cobble from site TS-5, L = mm, I = 68 mm, S = mm with a \\ip of ; e) oblate andesite cobble from site TS-6, L = mm, I = mm, S = mm, with a i//p of ; f) oblate dacite pebble from site TS-4, L = mm, I = mm, S = mm, with a t/>p of having been abraded and subsequently deposited by ancient fluvial action as were pebbles later found in association with angular lithoclasts from terraces in Avalon Canyon. Smith (1933) identified a few surfaces he believed to be terraces, but conjectured their origins on the basis of notched and beveled salients and apparent strand lines. Bailey (1941) and Slosson (1973) identified these previously described areas as Quaternary terraces. Methodology Exploratory surveys over most of the island identified water rounded pebbles and cobbles from the flanks of Mt. Banning, along promontories such as Salta Verde Point and Indian Head Rock and on canyon slopes. The only location where Quaternary fossils (primarily molluscan) were found in association with water rounded pebbles was on the north slope above the mouth of Cottonwood Canyon (site TS-5). They were exposed along the margin of a landslide displaced block of blue 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 Angele
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