tain stands is covered by a layer of red
sandstone of variable thickness, as it is much worn in places by
weather erosion. Below the top covering of red sandstone lie three
hundred feet of limestone and beneath the limestone five hundred feet
more of white sandstone. This arrangement of the rocks is plainly seen
in the walls of Canon Diablo.

The displaced strata of rocks in the hole are tilted and stand outwards
and great boulders of red sandstone and limestone lie scattered all
about. If the hole had been made by an explosion from below large
pieces of rock from each one of the different rock strata would have
been thrown out; but, while as just stated, there are plenty of huge
blocks of red sandstone and limestone, there are no large pieces of
white sandstone. After the superficial layers of rock had been broken
up and expelled en masse, the deeper rock of white sandstone, being
more confined, could not reach the surface in the shape of boulders,
but had first to be broken up and ground to powder before it could
escape. Then the white sandstones in the form of fine sand was blown
skywards by the collision and afterwards settled down upon the
mountain. The mountain is covered with this white sand, which could
only have come out of the big hole as there is no other white sand or
sandstone found anywhere else upon the entire plain.

In the vicinity of the mountain about ten tons of meteorites have been
found, varying in size from the fraction of an ounce to one thousand
pounds or more. Most of the meteorites were found by Mr. Volz, who
searched diligently every foot of ground for miles around. The smaller
pieces were picked up on or near the rim, and they increased in size in
proportion as they were distant from the mountain until, on a circle
eight miles out, the largest piece was found. Meteorites were found
upon all sides of the mountain but they seemed to be thickest on the
east side.

The writer first visited the mountain in the summer of 1901 and it was
the greatest surprise of his six weeks' trip sightseeing in northern
Arizona where are found many natural wonders. He was fortunate enough
to find a three pound meteorite within five minutes after arriving on
the rim, which Mr. Volz said was the first specimen found by anyone in
over four years.

Professor G. K. Gilbert of the United States Geological Survey visited
the mountain several years ago to investigate the phenomenon and, if
possible, to det