A SUMMER RAMBLE AMONG THE HEBRIDES. 203 



present nearly the same aspect as the organisms of the Upper 

 Lias of Pabba. There is in the same abundance large Pinnae, 

 and well-relieved Pectens, both ribbed and smooth ; the same 

 abundance, too, of Belemnites and Ammonites of resembling 

 type. Both the Moray outliers and the Pabba deposit have 

 their Terebratulae, Gervilliae, Plagiostoma, Cardiadse, their 

 bright Ganoid scales, and their imperfectly-preserved lignites. 

 They belong apparently to nearly the same period, and must 

 have been formed in nearly similar circumstances, the one 

 on the western, the other on the eastern coast of a country 

 then covered by the vegetation of the Oolite, and now known, 

 with reference to an antiquity of but yesterday, as the ancient 

 kingdom of Scotland. I saw among the Ammonites of these 

 outliers at least one species, which, I believe, has not yet been 

 found elsewhere, and which has. been named, after Mr Robert- 

 son of Inverugie, the gentleman who first discovered it, Am- 

 monites Robertsoni. Like most of the genus to which it be- 

 longs, it is an exceedingly beautiful shell, with all its whorls 

 free and gracefully ribbed, and bearing on its back, as its dis- 

 tinguishing specific peculiarity, a triple keel. I spent the 

 evening of this day in visiting, with Mr Duff, the Upper Old 

 Red Sandstones of Scat-Craig. In Elginshire, as in Fife and 

 elsewhere, the Upper Old Red consists of three grand divi- 

 sions, a superior bed of pale yellow sandstone, which fur- 

 nishes the finest building-stone anywhere found in the north 

 of Scotland, an intermediate calcareous bed, known techni- 

 cally as the Cornstone, and an inferior bed of sandstone, 

 chiefly, in this locality, of a grayish-red colour, and generally 

 very incoherent in its structure. The three beds, as shown 

 by the fossil contents of the yellow sandstones above, and of 

 the grayish-red sandstones below, are members of the same 

 formation, a formation which, in Scotland at least, does not 

 possess an organism in common with the Middle Old Red 

 formation, that of the Cephalaspis, as developed in Forfar- 



