1863.] GORDON AND JO ASS TARBATNESS. 509 



Rockfield, J, at which point the cliff is nearly obscured by drift, and 

 the shore-beds much broken and rolled, as shown in the Map and 

 Section, figs. 1 and 2. This is especially the case below Balloan 

 Castle. Throughout all this irregularity, however, the beds are 

 easily traceable as persistent, by walking along their exposed surfaces 

 between high- and low- water mark ; and in proceeding eastwards 

 the normal dip becomes distinctly visible in the cliff. Where this 

 is partially obscured by drift, as at L, the beach-rocks carry us 

 clearly forward, through conformable strata of yellowish sandstone, 

 to the thinly bedded and more ferruginous rocks of Wilkhaven. At 

 this point, M, there occurs a well-defined pebbly band, which 

 differs from a previous belt of similar nature west of Rockfield, at 

 H, in containing pebbles of a purer quartz ; whilst among the 

 rolled stones on the beach there are many hard felspathic pebbles, 

 together with numerous cherty fragments like calcedony, resembling 

 the more highly indurated portions of the Lossiemouth Cornstones 

 on the opposite coast. 



From this point onwards to the Lighthouse the rocks become more 

 ferruginous in their appearance, which character they present over 

 a well-exposed beach round by the north shore up to 0, where 

 there is a band of gritty sandstone containing gneissose and quartz- 

 ose pebbles. 



Interstratified with a few belts of light- coloured and good building- 

 sandstone, the flaggy red beds continue, with little variation of colour 

 or character, to P, maintaining the normal N.W. dip, at an average 

 angle of 2o°. 



Here, and at Q, in red and thinly bedded sandstones, there occur 

 distinct Reptilian tracks, persisting over considerable surfaces. 

 Without important variation of lithological character, save the 

 normal recurrence of the gritty bed 0, the beach presents a regular 

 descending succession of beds to T, where Ichnites of similar ap- 

 pearance to those at P and Q, occur in considerable numbers. The 

 specimen already forwarded to the Museum of Practical Geology was 

 found at S, and the Crustacean tracks previously mentioned occur at R. 



At U there is a recurrence of the pebbly bed M, as also in the 

 line of strike of the rocks, at Balnabruach. To the westward, for 

 about a mile, the beds are concealed by sand ; but near the inlet to 

 Inver, a few detached outcroppers at W show the northerly dip and 

 normal inclination, which are also observable at X, in the bed of 

 a streamlet running nearly north from the steading at Arboll. 



To the above I have but to add that the excavation of Ichnites 

 was carried on under the superintendence of the Rev. Mr. Campbell 

 of Tarbat. There is now at the Manse of Tarbat a large collection, 

 of Crustacean and Reptilian tracks, on blocks too unwieldy for 

 carriage to a distance, but which will be gladly submitted to the 

 inspection of all whose interest in the important question at issue 

 induces them to visit the locality. — [J. M. J.] 



The Rev. Dr. George Gordon then gave the following description 

 of the unconformity existing between the Oolites and the Sandstones 



