merican Museum party at Bone-Cabin
Quarry, 1899. Seated, left to right Walter Granger, Professor H.F.
Osborn, Dr. W.D. Matthew; standing, F. Schneider, Prof. R.S. Lull,
Albert Thomson, Peter Kaison.]

_Where They are Found._ The chief dinosaur localities in this country
are along the flanks of the Rocky Mountains and the plains to the
eastward, from Canada to Texas. Not that dinosaurs were any more
abundant there than elsewhere. They probably ranged all over North
America, and different kinds inhabited other continents as well. But
in the East and the Middle West, the conditions were not favorable for
preserving their remains, except in a few localities. Formations of
this age are less extensive, especially those of the delta and
coast-swamps which the dinosaurs frequented. And where they do occur,
they are largely covered by vegetation and cannot be explored to
advantage. In the arid Western regions these formations girdle the
Rockies and outlying mountain chains for two-thousand miles from north
to south, and are extensively exposed in great escarpments, river
canyons and "badland" areas, bare of soil and vegetation and affording
an immense stretch of exposed rock for the explorer. Much of this area
indeed is desert, too far away from water to be profitably searched
under present conditions, or too far away from railroads to allow of
transportation of the finds at a reasonable expense. Fossils are much
more common in certain parts of the region, and these localities have
mostly been explored more or less thoroughly. But the field is far
from being exhausted. New localities have been found and old
localities re-explored in recent years, yielding specimens equal to or
better than any heretofore discovered. And as the railroad and the
automobile render new regions accessible, and the erosion of the
formations by wind and rain brings new specimens to the surface, we
may look forward to new discoveries for many years to come.

In other continents, except in Europe, there has been but little
exploration for dinosaurs. Enough is known to assure us that they will
yield faunae no less extensive and remarkable than our own. We are in
fact only beginning to appreciate the vast extent and variety of these
records of a past world.

In a preceding chapter it was shown that the chief formations in which
dinosaur remains have been found belong to the end of the Jurassic and
the end of the Cretacic periods. The Jurassic dinos