Page:Quarterly Journal of the Geological Society of London, vol. 27.djvu/350

 (a) Atherfield Clay. Grey clay with usual characters ... 4 to 5 feet seen.

(b) Perna-beds with usual characters, but more weathered than at Atherfield, and of a brown instead of a green colour ; consisting of the following divisions : —

a. Hard brown sandstone (fossils very abundant). Perna Mulleti, Desh. Exogyra sinuata, Sow. Gervillia anceps, Desh. Panopaea plicata, Sow. Modiola. Pecten, sp. Trigonia aliformis, Park.

Thickness rather irregular but about 2 feet. (This bed passes gradually into)

β̞. Greenish-grey sandy clay with many fossils nearly 4 feet.

ɤ. Bed similar to a, with Ancyloceras and other shells 1 foot. (passing in its lower part into greenish-grey sandy clay, and so into)

(c) Blue paper-shales of the Wealden 9 inches.

(d) light-coloured and pyritic 1 foot.

(e) Dark-coloured paper shales (with Cypridea valdensis) and several layers of nodular ironstone 4 feet ?

(f) "Beef" 1 inch Limestone crowded with Cyrena and a few oysters, 9 inches 6 inches "Beef" 2 to 3 inches

(g) Finely laminated pyritic clay 9 inches.

(h) Ferruginous band almost entirely made up of shells (oysters and small univales) 3 inches.

(k) Other beds of dark blue laminated shales, with occasional between beds of limestone, imperfectly exposed ...                    30 to 40 feet seen.

The total thickness of the Cowleaze series cannot he exactly measured in Sandown Bay. In the marine hands I found Exogyra sinuata, Sow., E. Boussingaultii, D'Orb., Corbula striatula, Sow., Cardium subhillanum, Leym., with vertebrae and teeth of fish (Lepidotus, &c), and plant-remains. In one of the " Cinder " beds at this place Dr. Fitton found an imperfect but undoubted specimen of an Ammonites *, and I have myself obtained what appears to be a fragment of Ammonites Deshayesii, Leym. The yellow sands of the Barnes series are seen in Sandown Bay, and where they come to the surface form a well-marked escarpment, that on which Yaverland Fort is built. Here, however, the beds are not favourably situated for examination.

V. Sections in the Weald of Sussex, Surrey, and Kent.

The Wealden strata of this area, presenting few exposures in sea-cliffs, are not so well known as those of the Isle of Wight and Dorsetshire ; but there are not wanting indications that, like these latter, they graduate upwards through fluvio-marine beds into the Upper Neocomian, which everywhere conformably overlies them.

1. Leith Hill. In the Museum of this Society there is a series of fossils from Leith Hill, near Guildford, accompanied by a section in which the marine beds at the base of the " Lower Greensand " are


 * Trans. Geol. Soc. 2nd Ser. vol. iv. p. 190.