draw aggregate thickness close to #100 ft, at Dutch Cr about 75 ft. On hogback rim between both units thin appreciably, at one point each is about 15 ft or less thick. Clay bed between comes in at few places shown on AP's is never more than 2 or 3' thick. No indication of minor clay beds over main one - possibly because SS over left main bed is 1) channeled or 2) thickened, excluding them. Clay beds above ~~main bed~~ persisten this sandstone - ie in mid. Dakota are persistent. Definitely 2 seperated by ~~~ SS from 1 to 3' thick. Crop stands out clearly on A.P.'s -- and viewed from plains to east. No exposures of either bed. At Dutch Creek end of hogback they are pinched out by SS for most part. Note - The first SS of Glen is rather persistently even-bedded, contrasting with massive X-lam. SS of beds above. Massey Draw - Deer Creek hogback AIN- 49-04 5. Clay beds in mid Dakota here, thin and silty, at least 2, probably 3. Contact drawn at base of these, on top of sandstone that covers most of hogback: AIN- 48-93 (1) Clay bed comes in about 1/3 way up side of gap. Consists of some silty clay + siltst; SS on top lifts, has interform structure in base. Clay bed rests on 2'+ bed hard ripple mld SS. and split comes in below this. Below clay's ledge is 70 ft ~ Clay at most siltst. ~6" thick (est.), is 6" thick - next + argill SS.