
7€0 STRATIGRAPHICAL GEOLOGY. [Book VI. 
It is evident, however, that in this, as in all other geological 
periods, the prevalent type of sedimentation must have been that of — 
the open sea. Though traces of the thoroughly marine equivalents — 
of the red rocks of the basins have been less frequently detected, 
enough has been observed to reveal some of the general characters of 
the deposits and life of the Triassic sea. In the Alps masses of 
limestone and dolomite, with sandstones and shales, attaining a 
united thickness of many thousand feet, are replete with a marine — 
fauna, in which have been identified organisms that occur also in 
Triassic rocks of Northern Siberia, the Himalaya Mountains, New 
Zealand, and the Sierra Nevada on the Pacific slope of North 
America. ; 
Life.—A more or less marked paleontological break occurs 
between the top of the Paleozoic and the base of the Mesozoic 
formations, though this break has been found not to be so complete 
or universal as was at one time supposed. If the ordinary marine 
deposits of the time should yet be more extensively discovered and 
searched, the hiatus would no doubt be still further reduced. 
The flora of the Triassic period appears to have consisted 

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Fi», 358.—T ANIOPTERIS VITTATA ia. 859.—Haviserum COLUMNARE 
(Brongn.) (4). (Brongn.) (2). 
mainly of ferns (some of them arborescent), equisetums, conifers, and 
cycads. Among the ferns a few Carboniferous genera (Pecopteris, 
Cyclopteris) still survive, but new forms have appeared—Anomopteris, 
