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Depth of Sample 440* Red clay & medium grained gravel, few pieces of limestone, 50# clay & 50# gravel. Average pebble size: 1/4" diameter 450' Coarse gravel and red clay, pebbles up to 1/2" dlam. 90# gravel, pebbles rounded 460* Red clay, with small amount of gravel, 90# clay, pebbles up to 1/2" diameter 470' Red clay, occasional pebbles, 99# clay 480* Red clay, no pebbles 490* Red d a y ; no pebbles. (Small streak of gravel at 498* according to d r i l l e r 's log) 500* Red clay & coarse gravel; pebbles up to 1/2" diameter; 70# clay; pebbles rounded 510' Red clay & medium grained gravel. Rounded pebbles. Average size of pebbles * 1/4" dlam. 60# clay 520' Red clay with small amount of medium grained gravel. 95# clay. Average size of pebbles » 1/3" dlam. 530* Medium grained gravel A red clay. 60# gravel; 40# clay; pebbles up to 1/2" dlam. (Top of gravel * 535') 540* Medium sized gravel; pebbles up to 1/3" diameter; average size pebbles * 1/4" diameter; no clay. Slightly rounded ( pebbles 550 Coarse gravel; pebbles up to 1/2" dlam. Average size of pebbles = 1/3". No clay; pebbles sligh tly rounded 560* Medium size gravel; sligh tly rounded pebbles; pebbles up to 1/2" dlam. Average size of pebbles « 1/4" to 1/3" dlam. No clay 570* Medium size gravel. Same as at 560' No clay 580* Medium size gravel. Same as at 560* No clay 590* Medium size gravel. Same as at 560* No clay 600* Fine grained gravel; grains slig h tly rounded; no clay. Average size of pebbles less than 1/8" dlam. 610* Medium grained gravel; pebbles up to 1/3" diameter; pebbles sligh tly rounded. Few pieces of yellow clay. 99% gravel 620* Fine grained gravel. No clay. Average size pebbles « 1/8 and le s s. Pebbles rounded slig h tly . 630* Fine grained gravel; pebble size - 1/8" diameter;^pebbles slig h tly rounded; no clay, same as gravel at 620'* 640* Fine grained gravel; same as at 620*. No clay 650' Fine grained gravel; same as at 620*. No clay 660' Fine grained gravel; same as at 620*. No clay 670* Fine grained gravel; sligh tly fin e r grained than at 620* and at 660'. Few pieces of yellow clay; p ractically 100# gravel; gravel approaches a very coarse sand