162 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Jan. 8, 



(5) Boring for coal, Engine Pit, south of the river Brora, by "Wil- 

 liam Hughes, 1814 : — 



ft, in. 



"Roof-bed" 5 



Main coal 3 8 



Bituminous shale 2 



Slate coal with pyrites, not workable 1 4 



Fine clay alternating with shale 90 



(6) Section exposed in the coal-workings at Strathsteven Cliffs, 

 where the strata are faulted against the Strathsteven sandstone ; 

 observed 1872 : — 



ft. in. 

 " Roof-bed," hard greenish sandstone weathering brown, full of shells, 



Myacites recurvus, Phil., Astarte minima ? Phil., Gresslya peregrina, 



Phil., &c. Many small pebbles of the size of peas 3 



Greenish sandy clay. seen 



Bed of coal (main seam) with a band of pyrites in its midst 2 6 



Dark-coloured bituminous clay, with many compressed Equisetites, and 



several thin seams of white sand 5 to 6 ft. 



Seam of white shells — Perna very abundant, also Cyren a, &c., and Cypris 3 

 Black clay, with many flattened specimens of Equisetites coated with 



pyrites, many plant-remains and coaly seams, scales of Lepidotus ... 1 2 

 White seam crowded with shells of Perna, Ostrea, Cyrena, Cypris, &c., 



very variable in thickness 1 in. to 5 in. 



Black clay, with a band of shells ( JJnio ?) at the bottom 1 3 



Coal seam (made up of steins of Equisetites) 10 in. to 12 in. 



Black clay 1 , q 



Thin white shelly seam .J" 



Coal seam 1 



Black clay with nodules of pyrites and many plant-remains. 



These strata are very irregular ; the coals vary in thickness in the 

 course of a few yards ; and the shelly bands become split up and 

 unite again in places. The strata are greatly disturbed, being near 

 a fault (which was proved by these workings), and dip TS. 37°. 



(7) Boring at Clayside, probably in the same set of beds, the 

 " roof-bed " not being seen, however ; 1872 : — 



ft. in. 

 Coal of fair quality (thickness not ascertained) immediately underlying 

 drift. 



Stiff dark-coloured clay 20 6 



White sandy stone 1 6 



Sandy light-coloured fine clay 3 6 



White sandy rock ,... 2 



(8) The last section which I shall notice is that of Cadh'-an-Bigh, 

 on the Boss-shire coast, at a distance of 19 miles from Brora ; this is 

 interesting, as showing the differences which have taken place in 

 the strata, and the way the coal has almost thinned out. (See 

 fig. 8, p. 125.) 



ft. in. 



"Roof-bed" with fossils ...;. 1 



Coal (main seam), a poor carbonaceous band 4 or 5 in. 



Carbonaceous clay 2 



White- sandstone with plants 2 



