Geologists' Association. 475 



nodule or passage-bed of much importance, as this nodule-bed 

 marks the extinction of many of the Lower Gault forms and the 

 introduction of others. 



Of 247 species, which the author had noted from the entire Gault 

 of Folkestone, there occur 170 species in the Lower Gault, and 103 

 in the Upper, of which 46 species are common to both, whilst 20 

 species are peculiar to the passage-bed. 



The base of the Upper Gault may be known by the large quantities 

 of Inoceramus sulcatus. This sub-formation is characterized by 

 ammonites of the group Cristati : BracMopoda, not found in the 

 Lower Gault, recur ; though Bliynchonella is still absent. There 

 are, in the lower beds especially, considerable traces of Chelonian 

 and fish remains. The upper 50 feet consists of a pale grey marl, 

 of which the portion subjected to analysis yielded 26 per cent, of 

 lime carbonate. About 17 feet from the top occurs a seam of green- 

 sand, containing nodular bodies, having the appearance of pyriform 

 sponges. Just below this seam the Hylospongia of Sollas was found. 

 A peculiar fauna characterizes these greensands. Above them Am. 

 varians first appears. 



2. "On a Coltection of Fossils from the Upper Greensand of 

 Morden, Cambs," By H. George Fordham, Esq., F.G.S. 



III. — Saturday, June 27th. — The whole day was devoted by the 

 members to a trip to St. Mary's Cray, Well Hill,. and Shoreham, in 

 Kent. On arriving at St. Mary's Cray, the Thanet Sands and the 

 lower pebbly beds in the cutting at the railway station were first 

 inspected, and then the valley deposits close to the gas-works, con- 

 sisting of ten or twelve feet of fine loamy brick-earth with land- 

 shells and a little gravel, the chalk being seen below. Professor 

 M'Kewan Hughes, who was with the party, gave an interesting 

 field lecture on the valley and its surroundings. Skid Hill, distant 

 four miles, was then visited, and here Mr. Prestwich, r.R.S., who 

 had walked from Shoreham, met the company, and acted as conductor 

 for the day. Skid Hill, which commands good views of the long dry 

 valley of the Upper Cray, is capped with flint graveL It is a 

 portion of the interesting outlier of Thanet Sand and Woolwich 

 Clay, which at Well Hill — a mile further along the same elevation — 

 has a still larger deposit of flint gravel, of great age and singular 

 interest. Indeed, Well Hill was the central point of interest for 

 the day. Have we here, in Kent, a true glacial gravel ? Such was 

 the question, to which, as will be seen, the leader of the party gave 

 no hesitating answer. The spot where the gravel sections were 

 reached is more than 600 feet above Ordnance datum. Here, over- 

 lying the Woolwich beds, were large rolled flints, remarkably 

 fossiliferous, in a reddish sandy matrix, without any stratification. 

 A closer search, at the suggestion of Mr. Prestwich, discovered frag- 

 ments of chert and ragstone. These Mr. Prestwich refers to the 

 Lower Greensand beds of the Sevenoaks range, some six miles further 

 south, now separated by the deep and broad valley of Helmsdale. 

 The Well Hill gravel, according to Mr. Prestwich, is a solitary 

 patch of marine gravel of glacial age, which once stretched over 



