12 MR. G. W. LAMPLUGH OX THE JryCTIOX OF [vol. Ixxviii, 



ThicTcness in feet. 



■3 b. Loaiuy calcareous gi'eensand, with lydites and small grey irregular^, 

 pliosphatic nodules ; fossils, chietiy towards the base and in j 

 pockets at the margin of iron-grit crag — ' Belemnites minimus,' Y 3 to 4 

 ' Inoceramus concentricus,' " Ostrea,' Cirripedes, Serpulae, ' Tere- | 

 bratula,' etc. (see p. 49). J 



X. Protruding crag of hard purple iron-grit, worn smooth and bossy 

 at the top and partly at the sides ; with hollows and pipes both 

 at the top and the sides tilled in with fossiliferous greensand, 

 but the summit overwrapped by Gault clay : some adherent 

 03'ster-scars in sheltered parts : ironstone-breccia against the base 

 on the west side. Crag about 5 feet broad and 3 to 4 feet high. 

 A smaller detached lump of similar composition, about 7 yards 

 farther west, is probably protruding from another crag behind 

 the present section-face. 



3. Thin undulating pan or pans of iron-grit, associated with worn"^ 

 ironstone-breccia containing soft calcareous patches indicative of | 

 incipient or decomposed limestone-lenticles. The iron-grit pan )- 1 to 3 

 fairly continuous, but sometimes duplicated, enclosing lenticles j 

 of breccia, etc. : or with breccia in hollows above or below. J 



2. Silty beds : well-stratified loamy sand (in part glauconitic), silt, 

 thin clay-streaks, ferruginous layers with thin tabular concre- 

 tionary ironstone, etc. ; at the base, tabular ironstoue-lenticles 

 up to 3 inches thick. (See section in the previous paper, fig. 3, 

 p. 238.) up to 2^ 



1. Orange-coloured sand passing down irregularly into silver sand : 

 at tbe east side, orange-coloured and ferruginous brown sand 

 parti}- converted into iron-grit (1 x) down to 6 feet, with silver 

 sand below, to the bottom of the pit worked to about 15 



The upstanding crag of iron-grit, whicli was tlie most singular 

 feature of the section,^- was photographed soon afterwards by 

 Mr. Basil Schon, F.G.S., who kindly sent me prints (exliibited). 

 Living at that time in Ireland, I had no opportunity to ^dsit the 

 .section again until 1906, by which time no trace of the crag was 

 left; but I was told by the workmen that it rose higher than I saw 

 it, before they reached the end of it. In 1906, the section was as 

 follows : — 



Section at the southern end of Garside's old pit, 

 August nth, 1906. Surface, about 350 feet O.D. 



Thickness in feet. 



* Top as before ' 'not drawn] 



4. Gault; with well-marked bedding, dipping eastwards, brought out"^ 



b}- ferruginous-stained bands. ' Inoceramus concentricus ' very f about 5 

 abundant, but hardly any other fossil seen. Line between C examined. 

 Gault (4 a) and Greensand (3 b) not very well marked. ) 



3 b. Dark loamy greensand, thinning rapidly eastwards 5 to 2 



' Belemnites,' ' Ostrea,' and other fossils as before, but nothing and less, 

 fresh. Sharp base. 



^ A brief account of the peculiarities of this section was given in my report 

 of an 'Excursion to Leighton Buzzard' Proc. Geol. Assoc, vol. xx (1908) 

 p. 475. 



