558 Br. H. Sicks — Effect produced by Earth-movements. 



In each of these a vertical section of the coal exhibits numerous very 

 thin horizontal yellow lines, not unlike what we see in our English 

 spore-bearing coals ; but I have no proof that these lines were due 

 to spores." 



Mr. E. T. Newton, E.G.S., some years ago examined microscopi- 

 cally a piece of compact coal from Andreas's (or Andries's) Nek, 

 a spur of the Stormberg, sent by the late Dr. G. Grey, see Quart. 

 Journ. Geol. Soc. vol. xxvii. 1871, p. 51; and he says that "the 

 coal is bright and bituminous, with partings of dull material, 

 apparently ' mother-coal,' but there are no traces of spores. The 

 section shows the bituminous part as dark-brown lamina?, similar 

 to the bright parts of Wallsend coal ; but there are no spores to be 

 distinguished. The ' mother-coal ' remains black and opake in 

 section." ] 



Corrigenda. — At page 410 (September Number of Geol. Mag.) 

 for the woodcut and the description substitute the following : — 



A portion of one of the blocks from the Eat River, Eastern Province, South Africa, 

 showing four of the small shells (Cyrena ? neglecta) and parts and sections of 

 others. Natural size. 



At p. 410, line 7 from bottom, for " Cyrence " (?) read " Cyrence ? " 



V. — The Effects Produced by Earth-movements on pre- 

 Cambrian and Lower Paleozoic Bocks in some Sections in 

 Wales and Shropshire. 



By Henry Hicks, M.D., F.R.S., Sec.G.S. 

 (Read at British Association, 1890.) 



IN this paper I purpose giving a few examples to show the 

 powerful influences which have been exerted by Earth-move- 

 ments in producing changes in the rocks, and in obliterating the 

 evidences of succession in some of the disturbed areas in Wales and 

 Shropshire. For a long time past it has been well known that 

 certain changes such as cleavage, etc., have been induced in the 

 rocks in Wales and elsewhere by pressure, but only of late, years 

 has the magnitude of the results due to Earth-movements been 



1 See also the "Mining Journal," Decemb. 4, 1886, for a paper on the Coals of 

 South Africa. 



