282 Reports and Proceedings — Geological Societg of London. 



namely, the zones of Cardioceras alternans, ITopIites eudoxus, and 

 Perisphinctes Pallasi. No breccia-beds are found in the first of these, 

 but there are sporadic ones in the second, within which the inlier 

 occurs, and they become very numerous in the thii'd. The ordinary 

 autochthonous fossils, including plant-remains, occur in the inter- 

 vening shales, but the breccia-beds themselves contain only large 

 heterochthonous fossils, including Khynchonellas and corals, and 

 where these occur intermediate beds are found, composed of crushed 

 organisms. North of Helmsdale one breccia-bed has apparently 

 squeezed up the underlying shale into an anticlinal arch, against 

 another boss of Old Red Sandstone. 



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 

 correspond 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 Regis." 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, 

 ft. in. 



Soil AND Gravel 10 8 



Blue Lias probably 62 4 



-R„_„ { Black Shales ,, 38 7 



■^^°®- (Grey Marls „ 39 1 



,' Marls, without gypsum 124 7 



Marls, with veins of gypsnm 118 10 



Marls, with beds of gypsum 313 10 



Gypsiferous marls, with three ) ,„, „ 



beds of sandstone ( 



Hard clays and marls, with gypsum. 297 7 



Hard silty and micaceous clays, \ , .^ r 



with some gypsum j 



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 Rhaetic beds near Lyme are described, and the 

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

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

 to the dilKculty 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 one 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- 

 £ucJdandi, A. angidatiis, 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 



Keupek 

 Marls, 

 11 29 ft. 3 in 



