the top of this unit, holding well down at the base of the first slope of hogback, may locally be thick enough but few exposures show it is full of siltstone at S end near Nameless Cr. (Better near Deer Cr. end- see p.35). Disconformity- As indicated in Deer Creek area, the discounf. is at top of massive calcic ss of Lytle type, featuring a basal siltstone bed under 4th bldsh.. Claystone comes in under siltstone, for few inches, then Fe cap on Lytle-type sand. The basal siltstone is thin, may even be missing locally, at Nameless Cr gap, but N. along hogback it thickens, becoming a 2' sandstone at AIM-48-95, (2) where it rests directly on the Lytle ss. Good exposures of discounf along N side Nameless Cr. gap (where section was measured) leave little doubt that the break is either 1) at base of black shale or 2) at base of fine ss or siltstone bed, rarely over 3' thick, that locally comes in at base of 4th shale. The 3rd ss, which is thick, probably and double locally as it is just S. of Deer Cr., shows no evidence of containing the disconformity within it and doubt any possibility of similarity to Cenon setup. Cenon ss lense on Skyline is not like the 3rd ss in any respect except color- which is more like 'Dakota' than like typical Lytle. This isn't significant. Even the top of Lytle (as picked above) locally weaths like the GlenrDak. 4/