Vol. 6S.1 ARDEN SANDSTONE GROUP OF WARWICKSHIRE. 273 



The thickness of the marl forming the lowest bed reached in the 

 boring suggests the possibility that the Lower Keuper Sandstone 

 formation was completely passed through, and the marls and sand- 

 stones of the ' Permian ' of the Warwickshire district reached. 



This vertical section should be compared with that shown by the 

 boring near Stratford- on- Avon described by Dr. H. T. Brown/ 

 which is situated only a little over 2 miles north-west of the 

 Alveston-Hill well. The Stratford-on-Avon boring passed through 

 604 feet of Keuper Marl into 200 feet of Lower Keuper Sandstone. 

 The variation in the Lower Keuper is so great in this short distance, 

 that it is practically impossible to correlate individual beds in the 

 two sections ; and equal difficulty is experienced when the Marls of 

 the two sections are compared. 



The most individualized beds met with in the Upper Keuper of 

 the two borings were the following : — 



mr • 7 Distance in feet 



Ihickness , ? r 



. r . above base of 



Alveston Hill. tnjeet. j^^^^,^^^ 



Grrej gypseous marlstone 5 309 



Greyniarl 31 103 



' S t r a t f o I* cl - o n - A v o n . 



Grey marl and gypsum 5 539 



Grey marl and gypsum 20 359 



Eed marlstone with beds of sandstone . 29 290 



It will be seen that there is no bed in the Stratford boring cor- 

 responding to the 31 feet of grey marl at Alveston Hill ; also that 

 the 29 feet of ' red marlstone Avith beds of sandstone ' at Stratford 

 does not occur at Alveston. This latter zone is the one which 

 Dr. Brown correlates with the Arden Sandstone ; but, if the latter 

 is represented at all in the Stratford boring, its position is more 

 likely to correspond with the 5 feet of ' grey marl and gypsum ' ^ 

 occurring at 539 feet above the Lower Keuper Sandstone. 'J'here is 

 a possibility that the 20 feet of ' grey marl and gypsum ' in the 

 Stratford boring is the same band as the 5 feet of ' grey gypseous 

 marlstone ' at Alveston ; but it is quite evident that there is great 

 variation in the marls between the two localities. 



(ii) Well and Boring at Small Heath, Birnningliam. 



Particulars of this and the next section were supplied to me 

 about the year 1903 by the kindness of Mr. J. Cox, Superintendent- 

 Engineer of the City of Birmingham Baths Department. The 

 well and boring were made to supply the Corporation Baths at 

 Small Heath, Birmingham, in 1896. The sinking commenced as 

 a well 8 feet in diameter (lined cast-iron segmental cylinders to 

 113 feet, then concrete lining) to a depth of 170 feet, succeeded 

 by steel tubes of 12-inch bore with couplers to 250^ feet, followed 

 by a 12-inch borehole to 624 feet. There was a constant yield of 

 about 7500 gallons of water per hour. 



1 Geo! Mag. dec. 4, vol. iii (1896) p. 54. 



^ The Alveston-Hill boring probably commences below this horizon. 



