The Quarterly journal of the Geological Society of London . ed surface, on which reposes the Basement-bed of theLondon Clay (see Section in Journ. Geol. Soc. vol. vi. p. 2G0, andPI. I. Diag. B, Loc. sect. 6 in this volume). At Fetcham the sand bed immediately overlying the chalk is saidto be 35 feet thick*, and to be underlaid by a band of the Ostrea Bel-lovacina. On the chalk hills south of Leatherhead are several out-liers of the Lower London Tertiaries consisting chiefly of sandsand pebble beds. The most important one is at Headley-on-tbe-hill, * In open sections I have never seen it above
The Quarterly journal of the Geological Society of London . ed surface, on which reposes the Basement-bed of theLondon Clay (see Section in Journ. Geol. Soc. vol. vi. p. 2G0, andPI. I. Diag. B, Loc. sect. 6 in this volume). At Fetcham the sand bed immediately overlying the chalk is saidto be 35 feet thick*, and to be underlaid by a band of the Ostrea Bel-lovacina. On the chalk hills south of Leatherhead are several out-liers of the Lower London Tertiaries consisting chiefly of sandsand pebble beds. The most important one is at Headley-on-tbe-hill, * In open sections I have never seen it above 10 to 12 feet X. PART I. H 98 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. where there is a considerable thickness of mottled clays, capped bya thick pebble bed similar to that at Blackheath, and underlaid by2 to 3 feet of sand with the Ostrea Bellovacina. At Epsom the Thanet Sands commence : at least it is to that de-posit I would refer the lower beds (in.) in the following section onthe railway, half a mile north-east from that town. Fig. 6.—Rait. \y Cutting, Epsom. Feet. fd. Brownish sand 3 c. Green sand 2 J b. Coarse yellow and greensand with flint-pebblesin its lower part 4 la. Laminated grey clay 1^ {c. Fine white sand 12 to 15b. Grey sand 2a. Green sand and flints ... Of Near Ewell the mottled clays are worked at Nonesuch Park, butthe section is very imperfect. Thus far the middle division of the Lower London Tertiaries consists entirely of sands and mottled clays (with a comparatively smallquantity of flint-pebbles at their base), remarkable for the absenceof organic remains, excepting a bed of the Ostrea Bellovacina com-mon, but not constant, in the thin stratum of sand and pebbles re-posing immediately upon the chalk. We now, however, arrive at apoint where a very considerable, and rather sudden, change takes masses of rounded flint shingle, alternating with sands and lessfrequently with grey and carbonaceous clays often laminated, andcharacterized
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