November 8.
[1846] ...About two
miles from camp, our course was traversed by a seam of yellowish
colored igneous rock, shooting up into irregular spires and
turrets, one or two thousand feet in height. It ran at right
angles to the river, and extended to the north, and to the
south, in a chain of mountains as far as the eye could reach.
One of these towers was capped with a substance, many hundred
feet thick, disposed in horizontal strata of different colors,
from deep red to light yellow.