y known as the Edwin
Bridge. The local names celebrate persons who visited them soon after
they were first discovered by Emery Knowles in 1895.

They may be reached by horse and pack-train from Monticello, or Bluff,
Utah. One of the five sections of the reservation conserves two large
caves.

DINOSAUR NATIONAL MONUMENT

The Age of Reptile developed a wide variety of monsters in the central
regions of the continent from Montana to the Gulf of Mexico. The
dinosaurs of the Triassic and Jurassic periods sometimes had gigantic
size, the Brontosaurus attaining a length of sixty feet or more. The
femur of the Brachiosaurus exceeded six feet; this must have been the
greatest of them all.

The greater dinosaurs were herbivorous. The carnivorous species were not
remarkable for size; there were small leaping forms scarcely larger than
rabbits. The necessity for defense against the flesh-eaters developed,
in the smaller dinosaurs, extremely heavy armor. The stegosaur carried
huge plates upon his curved back, suggesting a circular saw; his long
powerful tail was armed with sharp spikes, and must have been a
dangerous weapon. Dinosaurs roamed all over what is now called our
middle west.

In those days the central part of our land was warm and swampy.
Fresh-water lagoons and sluggish streams were bordered by low forests of
palms and ferns; one must go to the tropics to find a corresponding
landscape in our times. The waters abounded in reptiles and fish. Huge
winged reptiles flew from cover to cover. The first birds were evolving
from reptilian forms.

The absorbing story of these times is written in the rocks. The life
forms were at their full when the sands were laid which to-day is the
wide-spread layer of sandstone which geologists call the Morrison
formation. Erosion has exposed this sandstone in several parts of the
western United States, and many have been the interesting glimpses it
has afforded of that strange period so many millions of years ago.

In the Uintah Basin of northwestern Utah, a region of bad lands crossed
by the Green River on its way to the Colorado and the Grand Canyon, the
Morrison strata have been bent upward at an angle of sixty degrees or
more and then cut through, exposing their entire depth. The country is
extremely rough and bare. Only in occasional widely separated bottoms
has irrigation made farming possible; elsewhere nothing grows upon the
bald hillsides.

Here, eighteen miles east of t