Advanced Text book of Geology Descriptive And Industrial
Advanced Text book of Geology Descriptive And Industrial
David Page
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THE OOLITIC SYSTEM, EMBEACING THE LIAS, THE OOLITE, AND WEALD EN GROUPS. 246. WHATEVER doubt may be entertained as to the epoch of some of the triassic strata, there can be none as to the biological relations of the system we are now about to consider. We have passed the boundary, as it were, of the older rocks, and have fully entered upon the upper or younger secondary formations. Or, speaking palseontologically, we have traced the history of systems whose fossils are all of Palaeozoic types, ...and now proceed to interpret the records of those that are unmistakably Mesozoic. The grand types and patterns are still the same radiate, mol- luscan, articulate, and vertebrate ; but the modifications of these types are new, and the consequent organisation higher and more complex. We now take farewell of the graptolites, cystideaiis, trilobites, and eurypterites of the Silurian seas of the gigantic crustaceans and bone-encased fishes of the old red sandstone of the sigillaria, stigmaria, lepidodendron, and other endogenous forms of the coal period of the cup-in-cup, honeycomb, chain, spider- web, and other corals of the Devonian and mountain limestones of the huge reptile-like fishes that swarmed in the Carboniferous seas, and are introduced to other species and newer forms of vitality.
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