1815.] Wernerian Natural History Society. 135 



careful study of these two chains of mountains will occasion some 

 alterations in the present Wernerian arrangement of floetz trap 

 rocks. Tlie rocks of which the Ochils are composed are the fol- 

 lowing : — 



1. Red sand-stone. 



2. Amygdaloid. — Basis clay-stone, 



3. Grey sand-stone. 



4. Lime-stone. — Very uncommon. 



5. Slate-clay. — Also in small quantity. 



6. Clay-stone. — Abundant. 



7. Tuff. 



8. Basaltic clink-stone. — Peculiar to the Ochils. 

 \). Green-stone. 



10. Clay-stone porphyry. — Common. 



11. Felspar porphyry. 



12. Compact felspar. — Common. 



The veins which occur in these mountains contain calcareous 

 spar, steatite, sulphate of barytes, iron, cobalt, silver, copper, 

 lead. 



Were those geologists, who consider all green-stone, basalt, and 

 porphyry slate, as lava emitted from volcanoes, to examine the 

 structure and relations of the Pentlands and Ochils, it would pro- 

 bably induce them to modify their opinions. 



2. A Geological Account oj the Southern District of Stirling- 

 shire, commonly called the Campsie Hills ; with a few Remarks 

 relative to the two prevailing Theories as to Geology, and some 

 Examples given illustrative of these Remarks. By Lieutenant- 

 Colonel Imrie, F. R.S. Edin. — This district constitutes a part 

 of the very extensive independent coal formation, which occupies 

 so great a portion of the southern part of Scotland, extending 

 from the German Sea at St. Andrews to the western parts of Air- 

 shire. The district described by Col. Imrie consists of ranges of 

 hills running north and south, and separated by narrow valleys. 

 He found that these hills are composed of beds which have the 

 following position, beginning with the lowest bed. 



1. Shale. 



2. Dark bluish grey lime stone with entrochl. 



3. Slate-clay. 



4. Sand-stone. 



5. Slate-clay mixed with glance coal. 



6. Dark bluish grey lime-stone. 



7. Slate-clay. 



8. Sand-stone. 

 y. Slate-day. 



10. Sand-stone. 



1 1. A very thick bed of green-stone. 



All these beds evidently belong to the independent coal forma- 

 tion, except tlic uppermost bed of green-stone, Avhich from its 



