unit no. thick descr 17 150 ft semi covered swale of dh gray shale covered by rubble 18 60 ft load casts ripple beds flat lam carb on bedding plan vfg dirty ss parallel bounded units 20-30cm interbedded w/carb bearing units w/ 1 meter thick massive spike forming ss yellow brown intolerance ripple at top 19 100 ft flaggy med gray silt to vfg ss weathers to yellow brown becomes massive with a 1/2 in thick silt base dark shale at 60 ft-90 ft