150 



Mr. Williamson on the Distribution of 



General Stratigraphical Table of the Formations described in the preceding pages, 



but in descending order. 



Oxford Clay. 



Upper beds arenaceous, tinged with peroxide of iron; they gradually become ^ 



more argillaceous, and of a blue colour towards the bottom > 1 30 feet. 



Lower beds argillaceous, blue, splitting into thin laminee and fragments .... J 



Kelloways Kock. 



Hard rock, much ironshot 5 feet. 



Soft and variable sandstones ; at Scarborough of a green colour, at Hackness 



softer and yellow 35 — 



40 



CORNBEASH. 



Fissile oolite, easily decomposed by the atmosphere 6 inches. 



Softer rock, sometimes ironshot 2 feet. 



Hard ironshot rock 2 — 



Blue clay, 3 inches to 4 — 



Upper Sandstone and Shale. 



A variable series of sandstones and clays 



Systematic List of Fossils enumerated in the Memoir. 



GENUS AND SPECIES. 



REFERENCE. 



STRATUM. 



PlantcB. 



Equisetum 



Cyclopteris digitata 



Otopteris obtusa 



Pecopteris Murrayana 



Carpolithes 



Dicotyledonous ? wood 



EchinidcB. 

 '.Cidaris vagans 





Upper sandstone and shale. 



Lindley and Hutton, PI. 64* 



Lindley and Hutton, PI. 128 



Adolphe Brongniart, PI. 126, f. 1— Sf. 











Kelloways rock. 

 Cornbrash. 



Phillips, t. 7, fig. IJ 



Cidaris , • • . 





w 



Phillips, t. 7, fig. 3 



Phillips, t. 7, fig. 2 



Phillips, t. 7, fig. 4 





clunicularis 



Galerites depressus 







* Fossil Flora of Great Britain, 1831-1837. t Hist, des Veg. Fossiles, Tome 1, 1828-lJ 



X Geology of Yorkshire, Part I. 1829. 



