Mr. Lonsdale on the Oolitic District of Bath. 247 



Lane leadins: to Clan Down in the descent of Iladstock Hill. 



Ft. In. 

 << Gritty lias" 6 



Marlstone 1 



Grey lias (one bed) 2 



" Corn grit" (three beds) 3 Q 



"Sun bed" i 



Descent from the Red Posts (6^ miles from Bath) to Camerton. 



Ft. In. 

 Blue clay above 100 



Grtttv lias] AT 1 ,• , ,-, 



T»i r. / iNo regular separation 4 



Marlstone J '^ ^ 



, ; Blue clay 7 G 



Grey lias 5 



Corn grit ") 



Sun bed )>Thcse beds are rarely exposed. 



White liasj 



Tlie superficial extent occupied by the lias in the neiglibourhood of Batli, 

 is considerably increased by the deep valleys which intersect the oolitic hills. 

 In the immediate vicinity of the city^ this formation composes about one-third 

 of the surrounding- heights. To the eastward it gradually declines; and the 

 extreme points of the boundary in that direction may be stated to be Midford, 

 Freshfordj and Box. To the west, the north-west, and the south-west, the 

 lias forms an extensive but undulating surface, occasionally overlaid by 

 detached portions of the inferior oolite, and occasionally cut through into 

 the red marl and the coal measures. 



The inclination of the lias is affected through the south-west part of the 

 district, under examination, by the irregularities in the subjacent coal field. 

 At Kelston Park the formation inclines gradually towards the south-west. 

 Between Corston and Burnet it forms an elevated ridge, marking the line 

 of a fault. Newton is built on a continuation of this ridge, and in the quarries 

 to the east of the village the dip is south-soutli-west. In the inclined plains 

 between Farmborough and Burnet, Burnet and the Avon^ and Stratton-on- 

 the-Foss and Radstock, the inclination of the strata is towards the north. 

 Along the eastern boundary of the formation the dip is south-east. 



Marlstone. 



Interposed between the lias and the inferior oolite are several beds of 

 sandy marl, to which Mr. Smith gave the name of marlstone. They effect a 

 gradual passage from the lias into the inferior oolite. The following sec- 

 tional list was obtained at Box in the summer of 1825. 



