E. E. S. BROWN AND S. PRIEST,

of each of these had been kept under observation for manymonths, and the channel-formation was clear. Their originappears to be connected with the fact that they are in the direc­tion both of the dip of the Chalk and of the present-day surfaceand underground drainage.

Continuing eastward, numerous sections of Drift and PlateauGravel were seen to rest indifferently on Chalk and Eocene beds.From the gravel an igneous erratic was obtained which has beendetermined by Mr. G. S. Sweeting to be an ophitic diorite. Be­tween Stone Wood Brickfield and Thrift Wood the Chalk sur­face was very hummocky, with pinnacles left between widepipes.

The first stages of the excavation through Swanscombe Hillhad been made at this time and the party was able to examinesections in Woolwich Beds and Thanet Sands on either side ofthe hill. Abundant evidence of hill-slips in the London Clayand surface deposits was seen on this occasion on the east sideof the outlier.

After tea at Springhead some of the party walked to North­fleet Station by a footpath along the Ebbsfleet, the remainderproceeding via Park Comer and Steep Hill gravel pits (nearMilton Street) to Grcenhithe Station, examining the numerousexposures of gravel and other Pleistocene deposits on the way.

REPORT OF EXCURSION ON 30TH JUNE, 1923.

E. E. S. BROWN AND S. PRIEST, Directors.

A party of 30 met at Greenhithe Station and walked byMounts Wood Road to the new sections, an exposure in ThanetSands being examined on the way. The whole excursion wasdevoted to the examination of the excavations made throughSwanscombe Hill and, on this occasion, the sections werefortunately at their best. Practically the maximum depth ofthe cuttings had been attained, very little sloping-back had beendone, and the whole series of beds described in the precedingpages were exposed; above all the hard blocks were seen insitu in the upper part of the Blackheath and Oldhaven Beds. Indescribing the beds in detail the Directors drew attention to thevariations that had been observed in them during the past sixmonths as the work had proceeded. Ample time was affordedfor fossil collecting in the Woolwich Series and the richly fossili­ferous Blackheath and Oldhaven Beds. After tea at Springheadsome of the party returned from Southfleet Station and otherswalked to Northfleet Station, noting features of the deep chalkpits by the church. At Northfleet House Estate the few feet ofThanet Sands with Bullhead Bed were compared with the thickerdeposit exposed eastward by Rosherville Schools.

PROC. GEOL. Assoc. , VOL. XXXV. PLATE 15.

R OAD-SECTION, SWAN SCOMBE HILL.

P hoto b)' A. J . uuu.

[To J'ICC P 1-18.

PROC. GEOL. Assoc., VOL. XXXV. PLATE 16.

ROAD-SECTION, SWANSCOMBE HILL.

WATLING STREET SECTIONS. 149

The authors' thanks are due to Messrs. Robert McAlpine andSons for permission to visit the sections, and to ::VIr. A. J. Bullfor a series of photographs, two of which are reproduced asPlates 15 and 16.

EXPLANATION OF PLATES IS AND 16.PLATE Is.-North side of main section looking East. London Clay and

Blackheath and Oldhaven Beds. Beds I-S are shown with the hardblocks in situ in Bed 3.

PLATE 16. South side of main section showing fault in London Clay andBlackheath and Oldhaven Beds with a throw of about 4ft. to the east­ward. The fault proceeded through the Woolwich Beds to the bottomof the section. A curious downward buckling of the beds on the east ofthe fault and adjacent to it is visible in the photograph. The position ofthis fault corresponds closely with the westernmost fault suggested inDr. Stamp's diagram, 1920, Proc. Ceol. Assoc., vol. xxxi., p. I9S,but no further definite faults were seen to the east although slippinghas undoubtedly taken place.