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.