and some other Stratified Deposits in the North of Scotland. 31 1 



That the strata of this series were originally continuous from the high cliffs 

 between Portree and Holme to the low coast on the opposite side of the 

 island^ as stated by Dr. MacCulloch_, I can confirm^ having found several 

 fossils in blue shale through which a deep canal has recently been cut by 

 Lord Macdonald_, to drain the lake of Mugsted. Among these shells are the 

 ammonites Konigi, ostreae in masses^ many belemnites^ flattened tellinae ? &c. 



The features of this island and the extraordinary relations of the secondary 

 strata to the trap-rocks^ have been so fully described in the "Geology of the 

 Western Islands, " that I abstain from any further detail, and simply refer to 

 the tabular arrangement^ (p. 321,) for a list of the fossils which I collected in 

 various parts, viz. on the N.E. coast, at Loch Sligachan, and also in the Isles 

 of Scalpa and Pabba. In addition to many acknowledged shells of the corn- 

 brash, inferior oolite and lias, there are several new species : of the latter, the 

 gryphaea which pervades the lower shale and limestone of the Hebrides, and 

 has been named after the geologist who first described it, is particularly to be 

 mentioned. (See Min. Con. tab. 547.) 



The gryphite limestone of Broadford and that of Sconser, containing am- 

 monites, encrinites, pinnae, &c., are members of the lowest formation in the 

 series, which may now safely be assigned to the lias of English geology, the 

 superior strata having been shown to belong to the overlying oolites. 



Mull, 



The most southerly part of the Western Islands in which the strata of the 

 oolitic series have been noticed, is upon the S. coast of Mull; on a part of 

 which I examined the beds in detail. From beneath the low and insulated 

 promontories of greenstone and amygdaloidal trap on the W. of Loch Buy, 

 sandstone and limestone rise into lofty cliffs at Carsaig House, below which 

 extensive beds of micaceous shale accompanied by veins of dull blue limestone 

 are uncovered upon the shore at ebb tide. Their structure resembles exactly 

 that of the shales of Pabba and Scalpa ; and the beds in these different places 

 contain many of the same fossils, viz. belemnites, gryphites, pectens, two or 

 three ammonites, including, the A. Conybeari of the lias and a new species, 

 A. Jamesoni (Min. Con. tab. 555), which, although never previously described, 

 is found in the has shale of Robin Hood's Bay near Whitby. The shale is 

 overlaid by a yellowish micaceous sandstone, distinguished here, as in the Isle 

 of Skye, by large calcareous concretionary nodules containing fossil shells ; 

 by which, and by immediate superposition to the gryphite shale, these beds 

 are at once recognized as belonging to the inferior oohte. The best general 

 section of the strata is seen upon the west side of the defile near Carsaig 



VOL. II. — SECOND SERIES. 3 S 



