AND LEICESTERSHIRE AND THEIR RELATIONS TO GEOLOGICAL STRUCTURE. 121 
Between the Leak Hills and Sileby, the dip is to the north-east; while south of 
the Sileby Fault it is east-south-east. In other words, there is an anticlinal structure 
in the Mesozoic rocks, the centre of the anticline coinciding with the Wreak Valley. 
These changes iu the strike are also brought out by the courses of the main river- 
valleys. The Soar occupies a strike valley excavated in the soft Keuper Marls below 
the Rhsetic escarpment, and it follows a south-east to north-westerly course from 
Syston in the Wreak Valley to its confluence with the Trent at Trent Junction. 
The Trent in its south-west to north-east course between Trent Junction and Newark 
is also a strike-stream, again flowing parallel with the Rhaetic escarpment. The hues 
of the two strike-valleys, the Soar and the Trent, make a right-angle with one 
another, the angle signifying the point at which the strike of the Triassic beds 
suddenly changes owing to the strata coming within the influence of the northern 
limb of the anticline. At Syston, where the Soar is joined by the Wreak, the course 
of its valley suffers a change of direction, although the stream still remains a strike- 
stream. This second change is due to the strata having now crossed the anticlinal 
axis of the Wreak Valley and entered upon the southern limb of the fold. 
Further information as to the northern limb of the anticline is obtained by 
combining the results gained from a consideration of the surface geology with those 
gained from a deep-well boring at Melton Mowbray. At Broughton Hill the base of 
the Middle Lias is about 420 feet above O.D."^ Therefore, allowing a thickness 
of 670 feet for the Lower Liast and of 35 feet for the Bhaetic Beds,| the base of the 
9 1 ^ 3 4 5 Miles 
I-J-1_I_I_I 
Fig. 8. Section to illustrate anticlinal structure in Jurassic Rocks at Melton Mowbray. 
Bh^tic would be at approximately 200 feet below O.D. But 3| miles to the 
south-south-east a deep-well boring on the northern side of Melton Mowbray 
showed that the base of the Bhsetic was at only 15 feet below O.D.§ In other 
words, between Broughton Hill and the north side of Melton Mowbray the strata 
have risen 200 feet. This southward rise probably continues beneath the town of 
Melton Mowbray, and is probably increased by faults in the Wreak Valley, the 
* ‘Geological Survey Map,’ 1-ineh (New Series), Sheet 142. 
t “The Geology of Melton Mowbray,” ‘ Mem. Geol. Survey,’ 1909, p. 22. 
f Op. cit., p. 104. 
§ Op. cit., p. 106. 
VOL. CCXIX.—A. R 
