490 



T. Mellard-Rcade — Faulting in Drift. 



that the spherulites are plentiful, and this I consider to be opposed 

 to your interpretation. I hope soon to be able to show you some 

 basic spherulites of another character, which also throw light on 

 the subject. 



IV. — Faulting in Drift. 

 By T. Mellard Readb, C.E., F.G.S., F.R.I.B.A. 



IN the Geological Magazine of last year^ I described a system 

 of Miniature Faulting observed by me in a fine bed of banded 

 silty clay at Nevin, Carnarvonshire. This year I have had the good 

 fortune to observe Faulting in Drift on a much larger scale in the 

 neighbourhood of St. Bees, Cumberland, which is highly instructive 

 and explanatory of several features of Normal Faulting which the 

 other illustration did not touch. 



Section of Faixlted Drift in Sea-cliff, Cumberland. 





A. A. Bed of I amina,ted Samh Di?PL*r.rr) ,5 ft by Fault F. 



The Faulted Drift in question, as exhibited in the sketch, is 

 exposed in a sea-cliff section South of Nethertown Station. It con- 

 eists of various beds of gravels and sand, some of the latter being 

 M'ell laminated. The faulting occurs at the northern end of the 

 section. It consists of one main fault (F) at right angles to the 

 shore, and two other smaller and parallel faults (//) stepped down 

 to tlie north of it. In consequence of the sharp shearing of the 

 beds, I was enabled to measure the throw, and found that the 

 laminated sand A ^= A on opposite sides of the fault showed a 

 tlirow of five feet. The hade of the fault, which was at about the 

 angle shown on the sketch, was to the down-throw, and the beds 

 were turned up against the fault on the down-throw side. Not only 

 so, but the gravel on the plane of the fault (D) was turned up with 

 the long axes of the stones parallel to the hade. The distinctioa 



^ "A Miniature Illustration of Normal Faulting," Geol. Mag. Nov. 1891, p. 487. 



