MESOZOIC AND CENOZOIC GEOGRAPHY 465 
uniform, equable condition of the Carboniferous, to a 
varied climate, in which some sections were warm, 
some cold, some moist, and some dry. 
It has been thought that evidences of glaciers have been found 
in the rocks of this time; and with the development of lofty 
mountain ranges, which occurred at the close of the preceding 
period, it would not be surprising if this were true. There is 
a wonderfully close relation between climate and land topog- 
raphy. During the early Carboniferous, the sea occupied exten- 
sive areas; and the land of that time had been reduced in 
elevation through long periods of denudation. With such geo- 
graphic conditions, there was little cause for local variation in 
climate; but after the growth of mountains, and the reduction 
of sea area, such variations would certainly be expected. 
In the east, Triassic rocks are found in various 
places from North Carolina to the Gulf of St. 
Lawrence. ‘They are mostly sandstones, colored reddish 
or brownish, and occurring in limited areas. In fact, 
many of them bear distinct evidence that they were 
formed in bays, enclosed within steeply rising walls, 
just as sediments are now gathering in the Bay of 
Fundy. Such a bay existed in the Connecticut valley, 
which it will be remembered was partly occupied by 
the ocean during the Devonian. Hence we conclude 
that at this time the eastern coast was a highland 
region, doubtless indented in a manner similar to that 
of the present coast of Europe and America. 
These rocks also bear evidence of still later moun- 
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