Stretched(?) pebble Barnes Conglomerate float (puddingstone) exposed in a drainage on the northeast slopes of the Santa Catalina Mountains, Tucson, Arizona. There is a hint here, too, of imbrication of clasts; shingling of a deposit of flattened or disk-shaped pebbles or cobbles. The Barnes Conglomerate is from the Dripping Springs Formation of the Middle Proterozoic Apache Group.
Photo by Esty Pape. Rock ID by J. Spencer and P. Pearthree.