William Hall Gilby

“ Where we see a particular assemblage of strata, as the limestone conglomerate, manifestly of the same formation, exhibiting in several parts of its extent changes of composition altogether depending upon a difference in its chemical constitution, it is impossible to explain such an occurrence but by supposing that the fluid menstruum must have contained in different places different chemical ingredients. Every geologist will figure to himself illustrations of the want of uniformity in the same rock formation. ”

“ It may seem at first very remarkable that the basis of the limestone conglomerate should be in one place merely a common limestone, and that in another spot, not far distant, it should contain a considerable proportion of magnesia. ”

“ Bees Head by bituminous clay, over this is a limestone containing magnesia and iron, and above this is a red sandstone, connected with which is clay, marl, and gypsum. This it will be perceived is almost an exact account of the succession of the red ground strata in this quarter. In Derbyshire we are informed that the magnesian limestone lies in an unconformable and horizontal position over the inclined strata, after the manner of its occurrence in this quarter, it therefore plainly belongs to the same formation, the red ground. ”