Castle Rock Area. [Denver-Arapahoe vld Colo State map] Stroud Whisenhunt. 197-R Since 1916 Johnson's clay mine. About 15'30' flat lying clay (0 to 25') Ten foot limit for work. Over burden 10', don't go over 25' Mine leased by Denver Sewer Pipe for years, Johnson inherited it and now mines it and sells it) most to Denver Sewer Pipe Clay body cut by rock channels, ss vcgl white. The white replaces redcl. Horses white ss + cg1 clean 10' of lenses of micz rock Clay chiefly yellow, sandy, red burning. Some gray and some red locally Clay bed varies. In cut following section Overburden- 10'ft fine gravel & sand. <white arkosic cal ss bits here 9.5't Chiefly yellow (at plastic, lower34'�) ft solid yellow. Then red streak 0.6 to 1.0 Then top part harder mottled lite grayish yellow #3 persistent brick 1.7 Mottled gray and red clay [sampled] 1.5 Micz rock 0.8 Gray, (lo) Silty clay 1.0 Nice rock 2 plus Dark gray Silly clay, with plant frags. #4 45