34 MIDDLE ALBIAN STRATIGRAPHY 



expands south of Wrecclesham to reach its greatest known thickness in this area at 

 Selborne. It then thins southwards towards Nyewood, and between this locality 

 and Storrington the Gault rests directly upon the oxidised indurated ' iron grit ' at 

 the eroded top of the Folkestone Beds. How much more of the Middle Albian is 

 represented in the higher beds of the Gault is uncertain. I expressed the qualified 

 opinion (1963a ; 51) that at Selborne it appeared that the cristatum-orbignyi Subzone 

 transgressions had cut down to the spathi Subzone, a view disputed by Milbourne (in 

 Hancock 1965 ; 250). 



Osborne White (1910 ; 17) followed Jukes-Browne's interpretation of the ' inter- 

 ruptus ' Zone (see p. 111). He records at Bradshott Hall (1910 ; 20) 2 feet (0-609 m -) 

 of clay with phosphatised ' Hoplites interruptus ' separated by 3 feet (0-914 m.) of 

 deposits from sediments containing Inoceramus sulcatus indicative of the lower part 

 of the Upper Albian. Unfortunately, this material has not been traced. The lowest 

 part of the intermedins Subzone with Anahoplites osmingtonensis no v. is present at 

 the outcrop in the Petersfield area (e.g. BMNH, C 35482-3). Further information 

 has been provided by borings carried out for the Gas Council by the British Petro- 

 leum Co. in the Winchester area in the deeper part of the Wessex basin (p. 69). 

 There, sediments of the intermedins Subzone are present above the spathi Subzone, 

 and the orbignyi Subzone is also represented within the silty clay facies. 



Between Petersfield and Storrington only three sections are available, all in the 

 spathi Subzone ; Nyewood, Pitsham, and Sullington (Owen 1963a). Recently, 

 Mr. C. J. Wood of the Institute of Geological Sciences recognised in the Brydone 

 Collection the material recorded by Jukes-Browne (1900 ; 112) from a well to the N. 

 of Graffham village. The specimen recorded as Hamites punctatus ? is here referred 

 to Protanisoceras (P.) barrense (Buvignier) and is preserved in lilac-grey silty clay, 

 the shell originally having been replaced by pyrite. It is accompanied by Inoceramus 

 concentricus in the same preservation. The ammonite indicates the lyelli Subzone. 

 The specimen of Hamites attenuatus is indeed of that species, but is preserved in 

 weathered yellowish pale-grey tough silt. It is of either loricatus or possibly lautus 

 Zone age. 



Osborne White (1924 ; 26) described a well section examined by Templeman 

 situated on the W. side of the lane to Barns Farm, 300 yds S. of its junction with the 

 Washington-Storrington A283 road (TQ 10501345). Below 10 feet (3-048 m.) of 

 clay containing an Upper Gault fauna, about 40 feet (12-192 m.) of Lower Gault was 

 proved including the cristatum and the upper part of intermedins Subzones. In a well 

 bored at Wiston Hall between Washington and Steyning 176 feet (53-644 m.) of 

 Gault was proved (Osborne White 1924 ; 25). It seems likely, therefore, that in this 

 area the succession in the post spathi Subzone sediments is closely comparable to that 

 described below exposed in the Horton Clay pit. 



(vii) UPPER BEEDING 



The Lower Gault section exposed in the British Portland Cement Manufacturers 

 Ltd's Horton Clay pit is shown in text-fig. 15, and its relationship to sections west and 

 east is shown in text-fig. 14. The pre-war workings were described by Osborne White 



