468 



THE GEOLOGIST. 



with some degree of certainty to the Carboniferous system, and of 

 which they will be found to constitute some of the lowest members in 

 Scotland. No Brachiopoda or other shells have, however, been 

 hitherto discovered in these rocks ; and Mr. Young is acquainted 

 with no other place where an equivalent to these beds has been found 

 but in the Merse of Berwickshire to the south-east of Scotland, where 

 they present the same thin-bedded character, and hold the same re- 

 lation to the Old Red sandstone and overlying coal-measures which 

 they do to the north of Glasgow. Above these beds in the valley of 

 Campsie, there occurs a series of thin-bedded strata, which appear to 

 Mr. Young to be a continuation of the Ballagan series, over which 

 a thick-bedded sandstone forms the floor of the valley, and contains 

 numerous casts of plants, &c. In the immediate neighbourhood of 

 Lennoxtown, a group of marine limestones and clay-ironstone, with 

 intercalated beds of freshwater strata, containing cypridse and re- 

 mains of fishes, is seen cropping out at the base of the north and 

 south hills ; they all underlie the main coal and limestone, and seem 

 to be the equivalent of the lowest fossiliferous beds of the Carluke dis- 

 trict. Above these beds, in the district under description, occurs the 

 Campsie main coal and limestone, with their accompanying alum- 

 shales and freshwater limestone ; these beds being the equivalents of 

 the Carluke main coal and limestone, and twenty-two fathoms above 

 this are found a bed of marine limestone and shales with clay- 

 ironstone bands, which may perhaps be considered on the same horizon 

 with the " Hosie's" limestone in the Carluke-parish section. At four 

 miles east of Campsie, on the north Hill, we come upon the very- 

 interesting section of Corrie Burn, which Mr. Young has worked out 

 with so much attention, and which consists of thick-bedded calcareous 

 shales, coralline and encrinal-limestones, yellow sandstone, and numer- 

 ous bands of clay-ironstone, which form the higher members of the 

 series, the organic remains being very abundant in the strata, and of 

 mountain-limestone types ; while the strata itself is the best exempli- 

 fication we have of that group in this part of the country. It par- 

 takes of the same dip as the beds in the valley of Campsie, viz., to 

 the south-east, and may be regarded as belonging to the higher 

 members of the lower marine series. In conclusion, we will append 

 Mr. Young's lists of the various strata from which Brachiopoda have 

 been derived to the north of Glasgow and valley of Campsie, as 

 far as possible, showing the descending order of the series : 



Top, 1. Robroyston beds, near Glasgow : limestone and shales. 



2. Bishopbriggs beds, near Glasgow : limestone (impure) 



and shales. 



3. Limestone (culmy), Moodies-burn ; six miles south-east 



of Campsie. 



4. Corrie Burn beds : sandstone, limestone, ironstone, and 



shales ; four miles east of Campsie. 

 5 Balquarhage beds : limestone (culmy), shales, with iron- 

 stone ; two miles south of Campsie. 



