Resume - Alameda N. to 1st Denver sewer pipe mine. Clay: - Main bed is not present at minable thickness until 1 ± 100 ft south of old stope hole WSW Denver Sewer Pipe mine. (AIN 50-17 (2)). It is present, as shown between here & Alameda, where overlying SS not in channels thru it. Opens up at swale AIN-50-19 (7) to about 3', this thickest between points mentioned. Most exposures can be identified by basal bentonitic clay which thickens southward and at swale just mentioned (and vicinity) contains concretory Fe within it. Split. - Bed below main bed present at those places main bed is except at S end near highway. At AIN 50-17 (1) old pit in it - very silty, then at N end pit, on N side of wedge-like lense SS forming local ledge, split thickens greatly, forming broad flat belt at crest hogback. Extent of this lens clay shown on photo by dashed green line. At N end line it begins to silt-up and [illegible] grades into siltstone 1/2 way along old stope hole in main bed in slope below. Dakota - In bench as shown - not exposed stratig. SS in Dakota thins at N where main clay comes in. 1st Glen. 26.