310 DR. A. M. DAVIES AND MR. J. PRINGLE ON [June 1913.. 



II. Description oe thi Borings. 



(1) The Eastern Boring. — General Remarks. [J. P.] 

 The site of the Eastern Boring is in a field in Steeple Claydon 

 parish, numbered 15 on Sheet XXII-2 of the -^gL_ Ordnance map 

 (Buckinghamshire) dated 1899, at a point immediately north of the 

 words ' Cattle Pens ' on that sheet. The height above Ordnance 

 datum may be estimated as 290 feet, by reference to the nearest 

 indicated altitudes on the adjacent roads. 



Details of the Strata passed through in the Eastern Boring. 



Thickness Depth 



in feet inches, in feet inches. 

 Surface-soil *4 *4 



< a f Dark-blue and grey clays with occa- 

 O n J sional nodules : the basement-bed is a 



s 5 •{ tough, brownish, shelly clay full of frag- 



p •" i merits of Cosmoceras, Belemnites, Ghry- 



S? ( phcBa, etc 93 3 97 3 



O 5 



Non-sequence. 1 



I Bluish-grey and grey limestone, oolitic 

 I in places, and becoming earthy below: 



unfossiliferous 1 9 



Dark-grey earthy limestone 9 



Hard grey limestone, shelly in places, 



fragments of Ostrea abundant ; base of 



bed yellowish and somewhat sandy 2 



No core seen for 5 6 



Grey earthy limestone, with plant-frag- 



, ments and Gervillia 1 3 



] Bright bluish-green clay 3 



G-rey earthy limestone 2 



Irregularly thin - bedded bluish - grey 



limestone, oolitic and shelly in places . 1 6 



Dark-grey earthy limestone on paler 



grey blotchy limestone, oolitic in places. 7 



Grey marly clays, passing down into 



brown and greenish clays, with a bed of 



green sandstone and a hard band of 



grey limestone. Lignite plentiful 16 9 136 



Non-sequence. 



('Very compact, blotchy, grey limestone 



(possibly equivalent to 'cream-cheese' 



top) 1 6 



Yellowish marly limestone, shelly in 



places 2 



Grey marly limestone, full of dark 



grains : limestone becoming darker 



below 6 



Grey blotchy limestone yielding Tere- 



bratula bathonica 2 6 



| Grey marl 6 



1 The term ' non-sequential ' was proposed by Mr. S. S. Buekman, to denote 

 the relationship of strata ' when the sequence is incomplete, but the planes of 

 the deposits are practically parallel ' Q. J. G. S. vol. li (1895) pp. 390-91. 



