In England generally, and in the greater part of Europe, both the Wealden and Purbeck beds are wanting, and the marine cretaceous group is followed immediately, in the descending order, by another series called the jurassic.
"The Student's Elements of Geology"
Sir Charles Lyell
But there is no similar break or discordance as we proceed downward, and pass from one to another of the several leading members of the jurassic group, the Upper, Middle, and Lower Oolite, and the Lias, there being often a considerable proportion of the mollusca, sometimes as much as a fourth, common to such divisions as the Upper and Middle Oolite.
"The Student's Elements of Geology"
Sir Charles Lyell
The absence, indeed, of carbonate of lime, as well as the scarcity of organic remains, together with the bright red colour of most of the rocks of this group, causes a strong contrast between it and the jurassic formations before described.
"The Student's Elements of Geology"
Sir Charles Lyell