Vol. 69.] TWO DEEP BOEINGS AT CALVERT STATION. 335' 



syncline and anticline mapped by Dr. Matley. 1 Further con- 

 tinuation of the anticline is suggested by the levels of the Liassic 

 outcrop near Stratford-on-Avon, and this is in line with the well- 

 known Vale-of-Moreton Anticline. Batsford Boring, which proved 

 Coal Measures on Silurian, is on the Vale-of-Moreton axis. West 

 of the axis is the remarkable sag, proved in the Mickleton Boring, 

 where the base of the Bhsetic was at — 815 feet O.D., although 

 5 miles away to the north-east, (i miles to the north-west, and 

 10 miles to the west the same horizon crops out at about +100.. 

 As the levels of the Middle Lias are not recognizably affected, 

 and the Lower Lias proves to have the enormous thickness of 

 1241 feet, it seems likely that we have here a case of Liassic 

 faulting masked by contemporaneous sedimentation. The other 

 side of the trough may be a line of Charnian trend in continuation 

 of the Lickey axis. There are some slight suggestions of this (see 

 PI. XXXIV). Farther south of the same region, the Bajociau. 

 flexures mapped by Mr. Buckman have a Charnian trend. 2 



The strike of the Cambrian rocks on the eastern side of the 

 Warwickshire Coalfield shows a variation between Malvernian and, 

 Charnian, between north-west by west and north by west. They 

 have approximately the latter trend as they disappear underneath 

 the Trias near Bedworth, and the Brandon Boring shows its con- 

 tinuance to the latitude of Rugby. 3 If we may consider the faults- 

 in the Jurassic rocks near Harbury and Cropredy as a key to the 

 structure beneath, the trend may have returned there to a Charnian. 

 direction, which, if continued, would carry the Cambrian towards 

 Bletchley, or with a subsequent return to Malvernian, towards- 

 Calvert. 



In the Triassic area of South Leicestershire, inliers and borings 

 show the presence of a variety of Palaeozoic rocks — unproductive 

 Coal Measures, Millstone Grit, Carboniferous Limestone (Visean),. 

 Cambrian, and Charnian igneous rocks. Continuation of this mixed 

 belt in a south-easterly direction is suggested by the Visean of 

 Kettering Road, Northampton, and the Charnian igneous rock 

 of Bletchley. Lastly, the strike of Charnwood Forest leads to the 

 Charnian igneous rock of Orton Boring. There is, however, a belt, at 

 least 10 miles wide, curving round from Cheltenham towards North- 

 ampton, in which the numerous faults are disposed athwart the 

 supposed Malvernian-Charnian lines. South of this belt, a Charnian- 

 direction is again seen in the post-Jurassic pre-Cretaceous folds of 

 the Swindon and Oxford-Aylesbury districts. In view of this, 

 transverse belt, and the absence of any clear indication of a 

 Charnian strike in the comparison of the two borings at Calvert,. 

 it would be very hazardous to assume the continuity of Warwick- 

 shire conditions so far as Calvert. 



1 Q. J. G. S. vol. lxviii (1912) fig. 7, p. 270. 



2 At Daylesford, on the eastern side of the Vale-of-Moreton Anticline, con- 

 glomeratic marlstone with Palaeozoic pebbles offers a problem for solution. 

 See E. Hull, 'The Geology of Cheltenham' Mem. Geol. Surv. 1857, p. 20 ;, 

 also L. Eichardson, Proc. Cotteswold Nat. F.-C. vol. xvii (1911) p. 200. 



3 E. D. Vernon, Q. J. Gr. S. vol. lxviii (1912) p. till & pi. lxi (map). 



