424 Geological Society. 



The phenomena thus described are then compared with those 

 which have been actually seen — or which may be inferred to occur in 

 the case of deposits from an ice-foot — and they are found to corre- 

 spond in a remarkable degree. And it is therefore concluded that 

 the breccia-beds are the product of an ice-foot of 

 Upper Jurassic age, which invaded the normal deposits of that 

 period. 



2. ' On a Deep Boring at Lyme Begis.' By Alfred John Jukes- 

 Browne, Esq., B.A., F.G.S. 



During 1901 a boring was made near Lyme Regis in search of 

 coal, and was carried to the depth of 1300 feet without reaching 

 the base of the Upper Triassic Marls. The following abstract 

 shows the formations passed through : — 



Thickness. 



Feet. Inches. 



Soil and Gravel 10 8 



Blue Lias probably 62 4 



-p [White Lias do. 22 1 



™ TIC J Black Shales do. 38 7 



- KEDS ' | Grey Marls do. 39 1 



( Marls, wi thout gypsu m 1 24 7 



j Marls, with veins of gypsum 118 10 



Keuper I Marls, with beds of gypsum 313 10 



Marls, j Gypsiferous marls, with three ] -ioa i\ 



1129 feet] beds of sandstone J L6 * 



6 inches, j Hard clays and marls, with gypsum. 297 7 



I Hard silty and micaceous clays, \ 14^ k 



[ with some gypsum J 



Depth. 



Feet. 



Inches, 



10 



8 



73 







95 



1 



133 



8 



172 



9 



297 



4 



416 



•2 



730 







864 







1161 



7 



1302 







A full journal of the boring is given, and the beds are compared 

 with those exposed along the cliffs from Lyme to Sidmouth. The 

 exposures of the Bhaetic Beds near Lyme are described, and the 

 ' tea-green marls ' are included in the Bhaetic group, although no 

 fossils have been obtained from them in Devon. Reference is made to 

 the difficulty of measuring the Keuper Marls. The site of the boring 

 is in the valley of the stream which enters the sea at Lyme, at a spot 

 about 1 mile north-west of that town and about half a mile east of 

 Uplyme, close to the boundary between Devon and Dorset. The 

 Blue Lias in the borehole belongs to the zones of Ammonites Buck- 

 landi, A. angulatus, and A.planorbis. Between the depths of 480 and 

 864 feet three beds of grey, calcareous sandstone were traversed, 

 each from 12 to 15 inches thick, and separated by beds of red and 

 grey, gypsiferous marl. Similar beds occur near Taunton and North 

 Curry, in Somerset. Some of the lowest beds may be called *' silt- 

 stones ' ; they were originally silty muds. The author concludes 

 that the boring did not reach the beds which near Sidmouth form 

 a passage from the Keuper Marls to the Keuper Sandstones, and 

 that the Keuper Marls proved by the boring are at least 1130 feet, 

 and may amount to 1200 feet in thickness. 



