Photographs of lower member, Backbone Ranges Formation, measured sections 08MWB-S4A and 08MWB-S4B. Unit numbers include letter "A" or "B" to indicate which leg of section is referred to. See section descriptive notes in text for geographic coordinates. A. Contact between grey-weathering, resistant carbonate of Sheepbed carbonate and basal, silty sandstone of lower member, Backbone Ranges Formation (unit 1A). Note relief on contact (dotted line) and onlap of silty sandstone against the contact. Above silty sandstone is a cliff-forming, sharp- to erosionaly based package of thick-bedded sandstone to pebbly sandstone
with well-developed planar-tabular cross-bedding (unit A2), overlain in turn by additional, recessive siltstone and sandstone (unit 3A). Stratigraphic thickness of unit A2 is approximately 10 m.