122 DE. A. H. COX : REPORT ON MAGNETIC DISTURBANCES IN NORTHAMPTONSHIRE 
continuations of the Rempstone and Sileby Faults (p. Ill), so that the total uplift 
of the Mesozoic strata may be expected to amount to considerably more than 
200 feet. 
The outcrop of the Middle Lias follows a course parallel to that of the Rhsetic, but 
the changes in strike in the district round Melton Mowbray are more pronounced 
in the case of the Middle Lias owing to the high relief of the ground caused by 
the harder character of the beds. The result is that the outcrop, after following the 
normal north—south or north-east—south-west course right from the Humber, is 
suddenly bent due east, and then sweeps round Melton Mowbray in a great crescent, 
six miles in diameter, before finally resuming the normal south-south-west strike, which 
is then maintained to the borders of Warwickshire and Oxfordshire. The centre of 
the Melton Mowbray crescent marks the anticlinal region. 
In the country farther east, the outcrops of the succeeding rock-groups up to the 
Inferior Oolite are affected by anticlinal folding. In the various divisions of the rest 
of the Lower and of the Middle Jurassic, however, the outcrop gives no evidence of 
the presence of an anticline. The Upper Jurassic beds are hidden beneath the great 
spread of alluvium that borders The Wash, but in the outcrops of the Cretaceous 
rocks an anticline is again clearly visible. Throughout Lincolnshire, from the 
Humber to The Wash, the strike is south-east. But in Norfolk, south of The Wash, 
the strike is swinging round, and taking on the normal south-south-west direction. 
The Cretaceous rocks are therefore also affected by an anticlinal axis running 
north-eastward beneath The Wash. This may well be the continuation of the 
east—west anticlinal axis which we have traced from the Soar Valley past (south of) 
Melton Mowbray. It is evidently one of the most important structures in the 
Mesozoic rocks in this part of England. 
7. Evidence for the Presence of an East—West Anticlinal Axis in the 
Concealed Paleozoic Rocks. 
The principle that the lines of movement and the structures in newer rocks often 
follow (“posthumously”) lines and structures existing in underlying rocks as the 
result of earlier movement is well known, and has been applied with success in 
many cases even though definite exceptions are known. If, now, we review the 
evidence that favours the application of this principle to the area now under 
consideration we obtain many clear indications that the post-Triassic movements 
followed the lines of earlier pre-Permian movements. There is firstly the evidence 
of the faults with a small throw in the Triassic rocks, and a much greater throw in 
the underlying Carboniferous rocks. Secondly, there is the fact that where the 
Palaeozoic rocks in the concealed coalfield are twisted round to the south-east, the 
overlying Mesozoic rocks also suffer a local south-eastward twist, but to a lesser 
degree than in the case of the older rocks below. There is then a definite 
