IN THE ANGLO-PARIS BASIN 



65 



which are labelled Haddenham. Although the circumstantial evidence indicates that 

 this is the Buckinghamshire Haddenham, this locality is not on the Gault whereas the 

 Cambridgeshire locality is. With this reservation in mind these ammonites (W. J. 

 Welford Colin., accession No. 176-24) are here identified as Euhoplites aff. meandrinus 

 and Dimorphoplites aff. niobe (the late mutation known from the upper nodule bed 

 of Bed IV at Folkestone). Both are preserved as incomplete blackish phosphatic 

 casts without the shell, and indicate a distinct nodule bed or clays with scattered 

 nodules of late loricatus Zone age within the Gault of this area. 



Davies (1899a ; 55-56) disputes that the Gault was exploited S. of Haddenham 

 Low situated about i\ miles NE. of Haddenham (See also Balance 1964 ; Map 2). 

 The main outcrop, however, is at no great distance to the E. of Haddenham. No 

 information has been published about Middle Albian sediments in the 6 mile tract 

 of country between Haddenham and Aylesbury, although Balance (1964 ; 396) has 

 reported the Lower Gault to be present throughout the area. 



(c) Aylesbury (Bucks) 



The basal part of the Gault was formerly exposed in the Walton Cutting on the 

 Metropolitan railway line (L.T.E.). The cutting extends SSE. from the bridge 

 (SP 823130) carrying the B 4443 (Stoke Road) over the railway line, Walton, 

 Aylesbury. It was described by Pringle & Chatwin {in Sherlock 1922 ; 9) who 

 reported that the basal bed of the Gault rests directly upon the Portland Beds. No 



Bed 



Li t h o I og y 



Mottled fawn shelly clay marked by a shell seam at the 

 base with part phosphat ised fossils. 



Dark grey shelly clay with scattered phosphatic nodules 

 becoming glauconitlc and gritty downwards In basal 10 inches I 

 the sediment has become very glauconltic and gritty in current i 

 swirls of glauconlte sand. 



Scattered black septarian phosphatic nodules in qlauconitic clay. 



Weathered grey glauconitlc clay. 



At 



■A 



Whitish phosphatic nodules with a few black septarian phosphates^ 



Glauconitlc gritty loam brownish in basal 1 foot with scattered i 5 

 brown phosphatic nodules. c 



Ferruginous yellow gritty clay resting on guttered surface of:- 

 Portland Beds 



Ins M 



10 



2 



2 north 



6 south 



2 1-1 

 4-5 

 2-3 



Fig. 28. Section exposed in trench dug by Messrs S. A. Leach & Co. along the field bound- 

 ary extending for about 150 yds from SP 8235012425 to SP 8245012333, approximately 

 midway between the B 4443 Stoke Mandeville road and the L.T.E. Metropolitan railway 

 line from Aylesbury to Stoke Mandeville, Aylesbury, Buckinghamshire. 



