I.—Contributions to the Palæontology of the Yorkshire Oolites

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Abstract
It was stated in the general introduction to these Contributions (GEOL. MAG. June, 1880), that the divisions to be adopted would be regarded more as a matter of convenience than from any other point of view. It might, perhaps, seem more philosophical to have treated the whole of the Lower and Middle Oolites as one section of the subject quâ the Gasteropoda. By commencing at the base of the series the true sequence in time would have been followed, and the various “species” or their derivatives traced throughout. Had all the collections examined by me existed under one roof, this might have been practicable, as it would certainly have been desirable.

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