332 PROCEEDINGS OP THE GEOLOGICAL SOCIETY, [Feb. 26, 



be no doubt, however, that the beds form the sides and bottom of the 

 bay to some distance out, and run in against the trap precipice as far 

 at least as the N.E. angle of the bay. Black mud and dark-coloured 

 gravel are constantly cast up when, on rare occasions, the water is 

 agitated, and form the whole tideway. The charm wanting to this 

 lovely bay is a girdle of shining sand. Near the headland, where the 

 beds first appear, a large dyke cuts through them, ranging nearly, 

 north, and greatly alters the limestone and shales. 



The fossils of these beds are Ammonites Jason, A. Lamberti, 

 Belemnites Owenii, B. sulcatus, Littorina Meriani, C'ucullcea concinna, 

 Pecten arcuatus, Ostrea dilatata, Avicula incequivalvis, l J holadomya 

 Protei, Serpula tetragona, 8. plicatilis, Nuculapollux. Prof. Forbes 

 does not mention the Uig beds or their fossils ; nor is it probable 

 that the place was visited by him ; it will be seen, however, by a 

 reference to his paper, that, of the Ammonites, one at least is most 

 probably the same, the A. cordatus of Staflin, the A. Lamberti of 

 Uig, and that the " Muricated Turbo " is the Littorina Meriani of 

 Uig. But at Uig his A. Vernoni and A. Eugenii were not met with. 

 The whole series at Uig is marine, the same as the fossils of the 

 Oxford Clay in other countries. 



Beds in other localities. 



In the clays under the Quiraing mountain Ammonites Lamberti 

 Was found. The patches of strata at Duntulm are estuarine lime- 

 stone and Oxford Clay, and have yielded A. Koenigi and Cyrence and 

 a portion of the Ostrea-liebridica bed. I did not visit Mugstok ; 

 but, from the fossils found there by Sir R. Murchison, there can be 

 no doubt that the beds are of the Middle Oolite ; these were "A. 

 Koenigi in masses, flattened Tellince and many Belemnites " (ut. sup. 

 pp. 311, 322). 



The strata at the head of the Loch-Bay inlet, in Yaternish, are 

 estuarine shales and limestones ; they come out in a thin stratum 

 from under the trap at the head of the bay, and spread over the tide- 

 way, where a sheet of trap is seen among them. No vertical section 

 is afforded ; but as the beds dip seaward or nearly "W.NYV. at 12° to 

 15°, and the edges are cut off, the structure is seen to some extent. 

 The overlying trap alters the beds in a striking manner. The beds 

 extend along the north side of the bay, being chiefly arenaceous lime- 

 stones and sandy shales. They extend a little to the west of Yaternish 

 village ; but, the shore being low and formed of gently sloping 

 cultivated fields on this side, no section is afforded of the whole 

 series. To the west of a low bluff of trap, apparently a great dike, 

 on which an old barrack stands, a low cliff or bank exhibits 7 feet 

 of red sandy marl or soft sandstone, and over it a few feet of crumb- 

 ling shale breaking into very small bits. No fossils were found in 

 either. Over the shale the trap rock comes on ; but the exact con- 

 tact was not seen. (For a notice of the interesting fossils of this 

 group see the Report.) Captain Macdonald, close to whose hospi- 

 table mansion this cliff is situated, conducted me to a singular cliff 

 of trap-tuff on the shore to the west, 20 or 30 feet in height, and 



