40 ME. G. Vr. LAMPLUGH OX THE JU:NCTI0X OF [vol. Ixxviii, 



'In the upper diggings there were exposed about 15 feet of Drift, chiefly 

 gravel, but with intercalations of sand, and at one place of a boulder-clay. 

 The materials of the gravel were chiefly flint, but Coal-Measure sandstone 

 was also found. In the lower diggings the Gault was exposed — a light bluish 

 clay with small brownish-white phosphatic nodides, and under this a remark- 

 able basement bed in which black phosphatic nodules (one at least a cast of 

 a lamellibranch) were imbedded in a bright bluish-green material, while here 

 and there masses of red oxide of iron occurred. Immediately below this 

 came black shaly Kimeridge Clay,^ from which the workmen had collected 

 fossils — chiefly reptilian bones, but including also a large clavellate Trigonia, 

 and a stout Belemnite evidently Jurassic. In the Gault itself, B. minimus 

 was found.' 



I am indebted to Dr. Davies for the loan of specimens whicTi he 

 obtained from the basement-bed in 1901 ; one is of semi-indurated 

 calcareous glauconitic sand, olive and dark green, streaked and 

 mottled with ochreous material, veiy like the glauconitic loam 

 associated with the iron-grit breccia and limestone at Shenley 

 Hill ; another is of glauconitic sand surrounding a worn fi-agment 

 of black phosj)hatic stone : another, of similar sand with traces of a 

 concretionary crust, probably once pyritous. The first specimen 

 includes some small wisps of pinkish calcareous matter, and is 

 doubtless the concomitant and variant of the limestone seen by 

 A. H. Grreen. 



During my visits to the place in the autumn of 1920 the clay- 

 pit showed a poor exposure of 10 to 15 feet of shattery dark-blue 

 Gault containing small brown-coated nodules (black internally), 

 surmounted by dark greenish boulder-clay like that of Claridge's 

 pit (p. 26), with the higher drifts recorded by Dr. A. M. Davies 

 not well seen, except the top bouldery gravel. 1 was informed by 

 the proprietor that the ' green band " at the bottom of the Gault 

 was 10 or 12 feet below the present floor. I found ' Belemnites 

 minimus ' and ' Inoceramus concentricus ' plentifully, but only 

 some poor traces of other fossils, in the Gault. 



Long Crendon (Oxfordshire). — On the steep rising ground 

 north of Long Crendon, 2 miles north-west of Thame, an irregular 

 outlier of Gault, about a mile long and for the greater part less 

 than a third of a mile wide, rests on an elevated platform of 

 Purbeck and Portland rocks in which numerous stone-pits have 

 been worked. The Jurassic strata have been described by many 

 observers, from the time of Fitton onwards, and reference is made 

 to the Gault in some of their descriptive sections ; but the earliest 

 observations (not however the earliest to be published) requiring 



^ On the old 1-inch Geological Survey map. Quarter-sheet 46 S.W., the 

 Jurassic inlier along the valley west of Wing is lettered g ^ and colotired as 

 Portland Limestone, but the error is corrected on the later 6-inch MS. map, 

 Bucks, xxiv, kept in the Library of the Geological Survey, this map showing 

 ihe inlier as Kimmeridge Clay, with the lettering g^^. Last summer (1920) I 

 saw a good exposure of dark-blue clay, with big septarian nodules of the 

 ' cement-stone ' type, at a watering-place for cattle in the brook south of 

 Wing Park, and obsciu-e exposures of similar clay in the banks at several 

 spots above and below this place. 



