and Belatimis of the Frontier Chain of Scotland. 253 



procure a good series of organic remains from this limestone. 

 The author procured a few fossils from it ; but a much better 

 series has already been described by Professor Nicol. 



(3.) South Girvan Group. — This is a very complicated 

 group, and though spread over a very wide surface by repeated 

 undulations between Girvan and the valley of the Stincher, 

 is of great thickness. The most remarkable beds are in the 

 valley of the Stincher, and are composed of hard arenaceous 

 bands, sometimes passing into very coarse conglomerate ; 

 and associated with them are calcareous shale and masses of 

 concretionary limestone of considerable thickness, which, in 

 the lower part of the Stincher, are nearly continuous. They 

 are well seen at Clonmell, Dal j eric, and Aldens ; also north 

 of the vallev on the Knockdolian estate, and at Loch Tor. 

 Farther up the valley of the Stincher the same series (of 

 limestones, shales, and conglomerates) is seen at Barr, and 

 along the Gregg water. The conglomerates contain fossils 

 and limestone bands. North of Barr is the Craigwell lime- 

 stone, underlaid by calcareous concretionary shale, and a 

 great conglomerate two or three hundred feet thick ; and a 

 little above the limestone is a conglomerate with a calcareous 

 band about seven feet thick. Lastly, on the road a few miles 

 south of Straiton, is a limestone twelve feet thick, imbedded 

 in a conglomerate. This Stinchard limestone is the most im- 

 portant calcareous zone among the rocks of the chain ; and 

 it is probably overlaid in its further range towards the N.E. 

 by the carboniferous series of Dumfriesshire. 



The coarse conglomerates remind us of some very coarse 

 conglomerates associated with the Llandeillo series in some 

 parts of South Wales. That the Stincher limestone is re- 

 peated in almost vertical undulations at Knockdolian farm 

 and Loch Tor, is, the author thinks, undoubted ; he thinks, 

 also, that the same may be said of a limestone that appears 

 on the neighbouring coast, near Bennan Head, associated 

 with dark indurated shale conglomerate. 



Still higher in the group here described (at Ardwell, on 

 the coast south of Girvan) are hard, greenish-grey, coarse 

 flagstones, with graptolites, and orthoceratites (of a Trenton 

 limestone species). The whole series forming this third 



