Vol. 63.-] 



AND COBALLIAX BOCKS OF BRILL. 



41 



The only hint of its presence hitherto given is in the following 

 sentence in the Geological-Survey Memoir : — 



' Hence [from Stanton St. John] by Breach Farm the Calcareous Grit takes a 

 stony form, showing as a hard sandstone with a calcareous cement, like the 

 bed at Studley described below.' x 



Fig. 2. — Sketch-map of the outcrop of the Arngrove Stone (Bhaxella- 

 chert) based on the Geological-Survey map. Sheet 45 S.E. 



1 = Gravel-Pit Farm. 



2=Boarstall. 



3= Arngrove. 



[Scale: 1 inch = 1^ miles.] 



4=Shabbington-Wood Lodge. 8=Bayswater Mill. 

 5=Beckley. 9— Holton Wood. 



6=Woodperry. 10= Studley. 



7= Stanton St. John. 



In reality, neither at Studley nor at Breach Farm is there a 

 4 hard sandstone with calcareous cement.' The stone-bed which 

 forms the mapped base of the Lower Calcareous Grit near Breach 

 Farm is quite typical Arngrove Stone. There is a good exposure 



Geology of the Country round Banbury, &c.' 1864, p. 44. 



