On some Comparative Sections in the Oolitic and Iron- stone Series of Yorkshire

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Abstract
Conclusion: On reviewing the facts here selected to illustrate and exemplify the variations of the middle and lower Oolites, and upper and middle portions of the Lias of Yorkshire, we find sufficient grounds to mark out approximately the geographical ranges of some remarkable mineral conditions—and accumulations of organic remains,—indicative of peculiarities in the depth and currents of the sea, the direction and proximity of land, and other great characteristics of the mesozoic period in this part of the earth's surface. Reserving for another communication the development of this subject, which cannot be properly examined without additional details, I desire to call attention in the mean time to a few prominent data.

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