地质学
风化作用
泥灰岩
变质作用
中生代
石膏
地球化学
合并(业务)
煤
钙质的
沉积岩
古生物学
考古
会计
构造盆地
业务
历史
作者
Robert Mackenzie Johnston
摘要
General features of the Tertiary System:
Overlying the prevailing sandstones, limestones, shales,
and coal beds of the Mesozoic Period are to be found vast
accumulations of clays, sands, gravel, marls, calcareous
grits, limestones, gypsum, and lignites, of either marine or
fresh-water origin. These accumulations, as a rule, do
not present the same features as those of the older rocks,
inasmuch as the process of consolidation and metamorphism,
excepting in rare instances, is far less complete. The
rocks generally are loose and incoherent, and their exposed
surfaces are less able to resist the weathering and denuding
influences of air and water.
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