The pictographs (they are painted rather than chisled) are at Symbol Bridge Cave, I believe. Big Painted Cave is on along the same trail near Skull Cave.
For the cave ceiling image -- that was an 8x10 with a 300mm lens, pointed about 70 degrees up from level along the trail inside the cave...at one of few spots wide enough to sneak in a tripod without someone tripping on it. Deep enough in that it was a long exposure.
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