ARRAN. GEOLOGY. SECONDARY STRATA. 369 



tioned, we proceed southwards towards Sannox, we find 

 the strata on the shore gradually beginning to incline 

 towards the south ; first at a small inclination and with 

 an E. N. E. dip ; in which position, or nearly, they will 

 be found to lie near North Sannox. If, proceeding still 

 further in the same direction, the dip be examined, it 

 is found gradually to become more southerly; at length 

 assuming an E. S. E. position, to be- followed afterwards 

 by strata inclined still more towards the south, as will 

 hereafter be shown. 



If from the same assumed neutral point at Scriden, 

 we now proceed northwards, the reverse inclination gra- 

 dually takes place, and the great conglomerate stratum 

 will be found slowly adopting an inclination towards the 

 north, to be followed ultimately by strata in a W. N.'W. 

 .position. The bed now described is therefore curved, 

 and is the lowest of a great series of strata which will 

 be found to lie on it in a conformable manner on each 

 side; adapting themselves to its inclinations as far as 

 their outermost boundary on the northern, and for a 

 .considerable distance on the southern, from which point 

 they assume new and intricate positions** 



This foundation being laid for the examination of the 

 secondary strata, we are enabled to compare with each 



* The directions of the strata are laid down in the map for the 

 purpose of assisting this explanation, and it is therefore unnecessary 

 to specify them in the description. It must however be remarked 

 that they do not pretend to rigid accuracy, being rather intended to 

 illustrate this general view, and to supply the unavoidable defects 

 of the accompanying diagrams. The accessible portions of the beds 

 are indeed far too limited to admit of such observations being correctly 

 made by taking averages of the bearings ; and the local irregularities are 

 at the same time such, that any examination of a minute nature would 

 inevitably lead to error if confined, or to doubt if repeated and ex- 

 tended. The diagrams (PI. 25. fig. 2, 3.) will show that the upper 

 edges of the strata superincumbent on the central basis at Scriden, 

 are all abruptly broken off at each side, even to the outer surface of 

 the whole mass of beds. 



VOL. II." li B 



