124 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



[Jan. 8, 



* Trans. Greol. 



At less than half a 

 mile southward, but quite 

 separated from the last, 

 we find the second patch 

 of Jurassic strata, that 

 of Cadh'-an-Eigh. It is 

 in part composed of in- 

 durated shales, similar to 

 those of Port-an-Eigh ; 

 but underneath these ap- 

 pear freshwater or estua- 

 rine beds of clay, sand- 

 stone, and coal. Their re- 

 lations to the Old Red 

 Sandstone against which 

 they he, but to which, as 

 at Cadh'-an-Eigh, they are 

 quite unconformable both 

 in strike and dip, are shown 

 in the section, fig. 8. 



I am not aware that 

 any patch of the Secon- 

 dary strata in situ has been 

 detected to the south-west 

 over the next seven miles. 

 The numerous fragments 

 of these rocks thrown up 

 on the shore, however, 

 render it not improbable 

 that such beds may exist 

 in some of the submerged 

 rocks and skerries which 

 abound along this coast. 



In Eathie Bay occurs 

 another interesting patch 

 of Jurassic rocks, which, 

 first pointed out by Sir 

 Roderick Murchison *, has 

 been frequently illustrated 

 in the writings of other 

 geologists, especially those 

 of the late Hugh Miller. 

 As in the last two in- 

 stances, the beds are only 

 seen during low water ; 

 they are composed in one 

 ^ part of alternations of 

 shales and argillaceous 

 limestones, with some beds 

 Soc. vol. ii. pt. 2. p. 307. 



