1862.] 



BINNET COAL-MEASUKES, AYRSHIEE, 



439 



E 





Coal-ford. 



Sorn. 



/\ 



- > 



:\ 



band ironstone at Common this fossil occurs ; and, from its occur- 

 rence there, coupled with other circumstances, my belief is that the 

 Common strata represent the lower portion of the middle division of 

 the Lancashire Coal-measures. At Sorn the upper portion of the 

 middle division is met with ; whilst the Catrine and BaUochmoyle 

 strata represent the higher part of the middle and the upper series 

 of Lancashire. 



The section (fig. 1) which it 

 is my intention to describe is 

 seen in the Valley of the Ayr, 

 and extends over three miles. 

 It commences with the Glas- 

 gow and South-western Eail- 

 way Yiaduct over the Ayr at 

 BaUochmoyle, and continues 

 through BaUochmoyle Braes, 

 Catrine, and Sorn to the Coal- 

 ford at the latter place. 



Since my observations made 

 on the Permian sandstone and 

 breccia six years since*, little 

 information has been pub- 

 lished, with the exception of 

 a paper by Professor Hark- 

 ness, P.E.S., on the Permian 

 rocks of Scotland t, who, at 

 p. 262 of his paper, states : — 

 "In going up the stream 

 [the Ayr], from the higher to 

 the lower beds of breccia, we 

 come upon a trap-dyke, which 

 cuts off the beds, and from 

 which the fragments entering 

 into the composition of the 

 breccias have been obtained ; 

 and on the eastern side of the 

 dyke we have Carboniferous 

 grits similar to those which 

 surround the sandstones of 

 the ThomhiU area." 



After a second examination 

 of the dip of these strata, it 

 appeared, by an observation 

 near the smaU iron gate by 

 the river-side opposite the old 

 quarry, to be at an angle of 



Cb 





Brook. 



Catrine Bank. 



\ 



PR 



The Ayr.— 



The Ayr.- 



The Ayr. 



Catrine.- 



The Ayr.- 



Ballochmoyle _ 



The Ayr. 



BaUochmoyle. 



Railway. — 



t 



o 



"CM 

 -P 





* " On the Permian Character of some of the Eed Sandstones and Breccias of 

 the South of Scotland," vol. xii. of the Society's Journal, p. 138. 



t " On the Sandstones and Breccias of South Scotland, of an age subsequent 

 to the Carboniferous Period," vol. xii. of the Society's Journal, p. 254. 



