Locality 96. Frogmen Ranch Fault Scarp, west facing bended-bed & Colgate bluff lying east of Red Coat Creek in E 1/2 , sec. 4, T. 10 N., R. 19 E., Ziebach Co., So. Dzk. Scarp shows two massive sands in Colgate, but no top to Colgate. No bottom to section as fault intervenes between concretional layer (3?) with T.L. fauna and bended lithology; Section 1, taken at southern-most bluff starts in lower part of bended beds. (N 80-85° E, 42° NE) wash fret ① 9.0 "Bended beds" chiefly grey silty clays and silt with relatively few silts-tone bends, bending not prominent. Weather to hard checked surface on silty clays; indents or flints on silts. ② 5.0 As above with slightly more distinct bending. At top are some more darkly weathered layers, some OB chip layers and just above silt layer with local flint, grey to RB weather cones scattered in it. ③ 12.8 Except locally this interval is a zone of mixing & contortion with scattered cone masses av. about 1.0 in diam. Top few feet locally shows bending but contortion runs thru entire interval plus some adjacent locally. ④ 4.0 Faintly bended silty clay with jarosite imprdg. Silt zone (persistent) at base (about 0.3') ; upper 1.0-1.5 is chiefly a fissile to blocky grey shale, with jarosite imprdg silt at top (also persistent) Local cones in this top layer. 39