1873.] 



JUDD THE SECONDARY KOCKS OP SCOTLAND. 



119 



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* Trans. Geol. Soc. 2nd 

 p. 354, &c. 



covered with slipped masses and vege- 

 tation ; but it is evident that the con- 

 tinuity of the sandstones is completely 

 broken up, and that the rocks are in 

 the condition so frequently observed at 

 their contact with the Palaeozoic strata, 

 and which is well illustrated by the 

 sketch (fig. 3) of the rocks seen in Allt- 

 Chollie (Colyburn) four miles to the 

 north of Clyne Kirk. At this place the 

 harder beds of the Jurassic sandstones 

 are seen, for a distance of about 100 

 yards from their junction with the Pa- 

 laeozoic rocks, to be broken up into 

 fragments of various sizes, which lie in 

 every possible position in the midst of 

 a mass of debris formed by the crush- 

 ing of the softer beds. This appearance 

 was well described by Sir Roderick 

 Murchison at this and several other 

 points*. Returning to the ravine at 

 Clyne Kirk, we find that at some little 

 distance from the junction with the 

 Silurian the beds of sandstone (b) and 

 of black argillaceous sand (c) are ca- 

 pable of being traced, and are seen 

 to be bent into sharp folds accom- 

 panied by slight dislocations. The 

 disturbance of the Jurassic beds di- 

 minishes as we remove further from 

 their junction with the Palaeozoic 

 rocks. 



Between Clyne Kirk and Braam- 

 berry Hill the Secondary strata are 

 concealed ; but they probably lie in a 

 series of long curves, in some cases 

 broken across by faults, as illustrated 

 by the section (fig. 4, which is drawn 

 to scale) exposed in a bluff on the north 

 side of the river Brora, where the rocks 

 consist of marine sandy clays of Middle 

 Oxfordian age. At Braamberry Hill 

 the sandstone strata, which overlie the 

 clays just mentioned, form an anti- 

 clinal, the rocks of which, owing to 

 their superior hardness, resisted denu- 

 dation ; and thence to Brora, as seen 

 in the gorge of the river, the strata 

 vol. ii. pt. 2. pp. 304 and 307; ibid. pt. 3. 



