62 



MIDDLE ALBIAN STRATIGRAPHY 



Bed 



12 Micaceous, glauconitic, very clayey burrowed silt. 



Li th ology 



Weathered light-grey pyritic clay with a few shell seams, 

 the shells being replaced by pyritic films. 



Ferruginous pyritic m arl, weather i ng rusty, with phosphatic nod's. 



Fawnish-grey slightly micaceous shelly clay. 



Fawn marly clay weathering ferruginous with pa rt-phosphat ised 

 fossils and a few phosphotic nodules. The bed is shelly. 



Shelly highly glauconitic dark grey clay with more 

 glauconitic silty bands. The clay is micaceous, and pyritic 

 filaments occur scattered throughout. Pockets of glauconite 

 occur also, together with some burrows infilled with grey 

 silt. Although still shelly, the basal 18 inches does not 

 contain ammonites and is immediately overlain by a 12inch 

 seam of highly glauconitic silty clay. A bedding plane 4 

 inches below the top contains pyritised ammonites with their 

 shells preserved. 



Dark grey gritty micaceous shelly clay becoming more plastic 

 downwards. 



Fawn grey plastic clay, shelly with a few burrows. Scattered 

 black septarian phosphatic nodules at top, and a few similar 

 ones occur to 1 foot below the top. A few pyritised ammon- 

 ites occur scattered throughout, together with large part 

 phosphatised ammonites in gritty concretions 4-5 Inches from base 



Tough dark grey gritty clay shelly with large black phosphatic 

 nodules at top, 8. scattered septarian phosphatic nodules at base. 



Fawn grey plastic, silty, micaceous, sparsely shelly clay, with 

 numerous pyritic filaments and part-phosphat i sed fossils 

 at base. 



Brownish fawn shelly clay, burrowed, with dark fa\ 

 nfillinqs; passing down into Bed1. 



Dark fawn-grey clay. 



t * W 



Ft Ins M 

 — 9 



9- 



8- 



7- 



6-12 

 6- 



3 6 

 to 



4 



9 V 

 6 



Fig. 27. Section in Gault at Messrs Hills of Swindon Ltd's Badbury Brickworks, W. of Day 

 House Lane, 200 yds SW. of Badbury Wick House, Chiseldon, Wiltshire (SU 18828160). 



