Field Note. 239 



to strengthen the conckision that they are normal. There 

 was, as might be expected with faults having- a great throw 

 that have moved often, evidence of crushing along the fault 

 lines. The section seen, on crossing- over from Jenkin Beck 

 into Chapel-le-dale, on the opposite side of the dale was con- 

 vincing of this, and admitted of no other conclusion, thus in 

 the neighbourhood of Ingleton, at any rate, the faults are 

 normal ones. This does not negative the possibility that in a 

 long fault line, where the direction varies so much, and where 

 the hade possibly varies too, there might be developed during 

 recurring movements severe local tangential stresses. There 

 was not time available for a prolonged investigation of the 

 structure of the rocks older than Carboniferous, but on the 

 second day, changes of strike and dip were observed that could 

 only be explained by folds along an east and west axis, causing 

 the beds to be repeated. This would not agree with the section 

 given in the 'Survey Memoir,' p. 4, or the statement on p. 5 

 that- ' there must be here exposed a thickness of about 10,000 

 feet of strata,' but would be in accord with the more recently 

 expressed views of Prof. Hughes. It will probably be found, 

 when the structure of the ground is completely worked out, 

 that we have here a complex of rocks much more ancient than 

 is o-enerallv understood. — T.S. 



mOLLVSCS. 

 Helix nemoralis and li. arbustorum in North West 

 Lincolnshire. — While taking a walk on Kettleby Beck bank in 

 Cadney parish, on April i6th, I filled my pocket with broken 

 molluscs from Thrush Stones. On returning home, I found my 

 gathering to be as follows: //. nemoralis, libellula, 117 speci- 

 mens, with ordinary banding ranging from 00000 through 

 12345 to (12345). There was only one variety wseolabiata (123) 

 (45). The variety rubella was represented by 74 specimens, 

 with exactly the same range of banding. The only interesting 

 shell was (123) x (45). Helix arbuslorum was fairly well 

 represented by 35 specimens, and the following varieties : three 

 ciiieta, fivejlavescens, and one fuscesceus. All these shells were 

 obtained by the Thrushes, from the rough grass on the fresh 

 water alluvium of the Beck bank. On the way home, the find 

 of the walk was made, at Pepperdale, Howsham, on the Chalky 

 Boulder Clay, by a Thrush Stone on the roadside, I picked 

 up one specimen of H. nemoralis, libellula, 12034. — Thomas 

 L. Warner, Cadney, Brigg, April 17th, igo6. 



1906 July I. 



