148 



MR, S. S. BUCKMAN ON THE BAJOCIAN [Feb. I9OI, 



There may, then, have been several elevations and several denu- 

 dations on the same lines ; so that the Palaeozoic rocks may lie much 

 nearer to the surface in the Yale of Moreton than has been supposed. 

 It is known that during Liassic and Triassic times there were 

 elevations and ' peneconteraporaneous ' erosions. If these also 

 took place in the Moreton Valley, successively along the same line 

 of weakness, were the Liassic and Triassic strata considerably 

 reduced in thickness ? 



The subject of local erosion in the Lias has not been systematically 

 followed up ; with improved zonal work it may yield results as 

 unexpected as those of the Bajocian denudation. 



There is this to be noticed : the denudations have reduced the 

 Inferior Oolite about four-fifths — from 250 to about 50 feet. 

 Much less reduction than this in Lias and Trias would be most 

 important. It is hardly to be expected that actual Coal-Measures 

 would be found in the anticlinal axis ; but they should lie along the 

 sides thereof. In this direction studies of the Jurassic rocks may 

 be of considerable economic importance. 



The relation of Jurassic folds to Palaeozoic folds is suggested by 

 these points : — 



(1) That the Moreton anticline (Jurassic) is nearly in a line with the Pennine 



range ; and 



(2) That a main axis from the Mendips towards Pewsey is indicated by the 



folds of the Dorset and Cotteswold strata. 



The anticlinal axes of the Cotteswold and Dorset strata are really 



lateral axes at right 



Fig. 4. — Diagram, of ilie Cotteswold and angles to a main axis ; 



Dorset strata^ as they crop out beneath for the axes of the Cot- 



beds of Garantianae hemera {Upper teswold strata rise to- 



Trigonia-(/n7). ^ wards the south-east, but 



the axes of the Dorset 

 strata rise towards the 

 north- \A est. Across the 

 Cotteswolds from the 

 south-east higher and 

 higher beds, but across 

 the Dorset area from the 

 south-east lower and 

 lower beds, are found 

 beneath the covering of 

 the top beds of the In- 

 ferior Oolite. The ap- 

 pended diagram (fig. 4) 

 is only a rough sketch, 

 but it will illustrate the 

 foregoing remarks. 



The main axis runs 

 from the Mendips north- 

 eastward. At right an- 

 gles more or less thereto 

 are lateral axes. 



scale; about 50 miles to one inch 



Engl 

 Chan 



