94 DR. A. H. COX; REPORT ON MAGNETIC DISTURBANCES IN NORTHAMPTONSHIRE 
deposits of material that is only feebly magnetic, providing that the geological 
structure is not too complicated. But in all such cases due regard would have to be 
paid to the possibility, and indeed in many cases the probability, of other and perhaps 
larger deep-seated disturbances being added to those arising at comparatively shallow 
levels. 
Accordingly it may prove important, or even essential, to work out the details of 
disturbances caused by deep-seated rocks, possibly of little or no economic value, in 
order to obtain a measure of the factors superimposed by them on disturbances due 
to deposits of economic importance, the distribution of which it is required to 
ascertain. The results obtained in Leicestershire, which are discussed in the 
following section, furnish an example. 
(B). LEICESTERSHIRE: MELTON MOWBRAY DISTRICT. 
I. The Geological Sequence and Steucture. 
The district here described embraces the triangle between the towns of Melton 
Mowbray, Nottingham, and Leicester. It was necessary for the geological exami¬ 
nation to embrace a wider region, since older rocks, such as may be present deep 
underground beneath Melton Mowbray on the east, actually crop out at the surface 
further west. 
The geology of the district is illustrated by the New Series of 1-inch Geological 
Maps, and by the accompanying explanatory Memoirs issued by H.M. Geological 
Survey.* The information in these Memoirs has been largely drawn upon during 
the compilation of the following account of the geology of the district. 
I. The General Succession. 
The Formations that occur at the surface, or that may occur underground (within 
the area over which the magnetic observations were made), are :— 
Recent.Alluvium.Clays, sands, and gravels 
in river-valleys. 
U nconformity. 
* 1. “ The Geology of the Country between Atherstone and Charnwood Forest,” by C. Fox-Strangways 
and W. W. Watts, ‘Mem. Geol. Survey,’ 1902, and Sheet 155, 1-inch Geological Map (New Series); 
“ The Geology of the Country between Derby .... and Loughborough,” by C. Fox-Strangways and 
W. W. Watts, 1905, and Sheet 141; “The Geology of the Leicestershire and South Derbyshire Coal¬ 
field,” by C. Fox-Strangways, 1907 ; “ The Geology of the .... Derbyshire and Nottinghamshire 
Coalfield,” by W. Gibson, 1908, and Sheet 125; “The Geology of the Country between Newark and 
Nottingham,” by G. W. Lamplugh, W. Gibson, and others, 1908, and Sheet 126; “ The Geology of the 
Melton Mowbray District,” by G. W. Lamplugh, W. Gibson, and others, 1909, and Sheet 142; “The 
Geology of the Country around Nottingham,” by G. W. Lamplugh, W. Gibson, and others, 1910, and 
Nottingham District Sheet; “The Concealed Coalfield of Yorkshire and Nottinghamshire,” by Walcott 
Gibson, 1913. 
