When Bill is writing about rocks, his journal says things like, the strata are mostly wacke sandstones with strong colouration from iron and manganese oxides and a silica cement. Probably volcanic fallout laid down on a seabed. There is a strong clay component on the exposed face but this appears to be an accumulation, not a native component of the stone. Paucity of fossils is striking.
Talking about anything else he says stuff like, I believe this is what botanists technically call a Goddamn Huge Tree.