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About midway of the section on this part of Green River, are limestones of an obscure oolitic structure, but no true oolite was observed.
And even as regards the Mammalia, the scanty remains of Triassic and Oolitic species afford no foundation for the supposition that the organization of the oldest forms differed nearly so much from some of those which now live as these differ from one another.
During the night we travelled slowly over densely scrubby and sandy ridges, occasionally crossing large sheets of oolitic limestone, in which were deep holes that would most likely retain water after rains, but which were now quite dry.
On the other hand, the two Terebratulae and the Spirifer point, in the opinion both of M. d'Orbigny and Professor Forbes, to the oolitic series.
Flinders been able to examine the rock formation of the Great Australian Bight, he would have found that it was for the most part an oolitic limestone, with many shells imbedded in it, similar in substance and in formation to the fossil bed of the Murray, but differing from it in colour.
If, however, the species from Las Amolanas, in the Valley of Copiapo, had, as in the case of those from Guasco, been separately examined, they would probably have been ranked as oolitic; for, although no Spirifers were found here, all the other species, with the exception of the Pecten, Turritella, and Astarte, have a more ancient aspect than cretaceous forms.
Bean from these Yorkshire coal-bearing beds, point to the estuary or fluviatile origin of the deposit. At Brora, in Sutherlandshire, a coal formation, probably coeval with the above, or at least belonging to some of the lower divisions of the Oolitic period, has been mined extensively for a century or more.
Here round the Roman Ratæ, the predecessor of our Leicester, settled a tribe known as the Middle English, while a small body pushed farther southward, and under the name of "South Engle" occupied the oölitic upland that forms our present Northamptonshire. But the mass of the invaders seem to have held to the line of the Trent and to have pushed westward to its head-waters.
And even as regards the Mammalia, the scanty remains of Triassic and Oolitic species afford no foundation for the supposition that the organisation of the oldest forms differed nearly so much from some of those which now live as these differ from one another.
Although aware how unusual the term must sound, I shall, for convenience' sake, call this formation cretaceo- oolitic.
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