Mason : Lincolusliire Entomology. 



201 



however, clear that another arching- took place at some time 

 after the Permian (Ma§"nesian Limestone) rocks were deposited, 

 for those rocks have now a dip or inclination away from the 

 Pennines on the east, as their equivalents have on the west. 



This movement probably did not take place all at one 

 geological period, but was renewed again and again, the last 

 movement being attested by the easterly dip of the chalk in 

 Lincolnshire and Yorkshire. 



The Soutk-Western Boundary. — In the neighbourhood of 

 Nottingham the general dip of the Coal Measures swings round 

 from an easterly to a north-easterly direction as the beds dis- 

 appear beneath a discordant cover of Triassic rocks. In other 

 words they rise towards the south-west. The strike or level- 

 line of certain seams has been determined to be in agreement 

 with this. 



These are the significant indications of the rise of one edge 

 of the basin against a barrier of older rocks, and though the 

 actual rim is not visible, its position can be defined with 

 certainty to within a few miles, for at a very short distance to 

 the south-west the Triassic rocks can be seen upon the very 

 ancient rocks of Charnwood. The Charnwood tract is com- 

 posed of a complex group of very ancient rocks bent long before 

 the Carboniferous period into a general anticline running from 

 about north-west to south-east. Repetition of folding upon the 

 same axis rolled up the Carboniferous rocks and formed a 

 barrier to which the striking differences between the Permian 

 rocks of Leicestershire and those of Nottinghamshire are 



probably due. (To be cuntinned. ) 



ENTOMOLOGY. 



Lincolnshire Entomology. — At the recent meeting of the 

 Lincolnshire Naturalists' Union held at Louth, two larvee of 

 Sesi'a asiliformis {^^^cynipiforniis) were taken from an oak 

 stump, and from the poplars larvae of Tceniocajupa populeti wevQ 

 obtained. — G. W. Mason, Barton-on-H umber. 



«y-0-«" — 



It is very difficult for the ordinary farm labourer to comprehend the 

 aims of field g-eologists who from time to time visit his country side. We 

 have heard of our friends of the hammer being- mistaken for burg-iars, bill- 

 stickers, and even anglers, but the following- incident from the East Riding- 

 shows that the rustic imag-ination is still unexhausted in this direction. 

 A friend of ours, wishing- to overtake a part\- of geologists, asked a farm 

 labourer if he had seen them pass along. ' Why, Ah deeant knaw,' he said, 

 'but Ah did see sum chaps uppod rooad ; nobbut Ah. deeant think at they 

 W'er g-'olog^ists 'cos the}-'d tics an' collars on ! ' 



1905 Ji-'ly 



