Page:Field Notes of Junius Henderson, Notebook 3.pdf/4

and Dakota about 100 yards. S of creek Niobrara Niobrara dips 82¡ strike N 45¡ E carries it directly into outcrops on N side. N end of S side outcrop swings to N for last few feet. 75 horizontal yards across Benton and 75 across Dakota. Found no yellow ss in Jurassic at mouth of canyon, but the l.s. containing the fossils (of which we have had slides made) and one foot (or more) concretionary zone is present. In isolated hill inside mouth of canyon the deep red Lykins passes above into pinkish roundly massive s.s., which abruptly changes to whitish, in turn abruptly but apparently conformably into angular yellow s.s. Probably that in which Hayden found Pentacrinus Pentacrinus and Ostrea Ostrea. Above this is the fossiliferous l.s. At one point there is a marked unconformity near base of Jura for 50 ft thus ((drawing in field book)). Worked back S of Niobrara ridge, found no fossils in Benton and only Inoceramus Inoceramus and Ostrea Ostrea fragments