Daveyston, nearly opposite tlie hotel, where a small quarry of 

 clay slate "has been opened for building material. Tbougb 

 ever on the qui vive for fossils, or indications of such, yet my 

 search has never been successful in bringing any undoubtable 

 ones to light, except what appear to be impressions of fucoids 

 preserved in ferruginous oxide, in some quartzites. 



In the paper on the " Eocks and Cliffs about Ardrossan" 

 (Trans. Eoy. Soc, vol. II., 1878-9), I treated the hornblende and 

 mica schists, quartzites, and marbles, under the term Primary 

 Eocks. Familiarised as I am with the varying appearances of 

 similar rocks, subsequent examinations have confirmed the opinion 

 that the first three really are identical with similar rocks on the 

 mainland, and belong to the same formation, together with a 

 gneiss in the Torke Valley Hills, and a coarse conglomerate 

 and arenaceous shale on their easterly spurs. But the last, 

 viz., the Ardrossan marbles, are scarcely so, but seem to be 

 the lowest part of the Silurian formation, on account of their 

 conforming mode of stratification and deposition. Though 

 they have not yielded any fossils, yet the fossiliferous " Parara 

 limestones, &c.," appear, either intercalated between them, or 

 are but a less metamorphosed part of the " marbles," in which 

 the fossils have not been wholly destroyed by crystalline 

 arrangement. What formerly was taken as the plane of 

 deposition, seems now to me, according to observations in 

 Eogues' Gully, to be the plane of cleavage, though I may be 

 mistaken in this respect. 



All the members of the Silurian group appear to be deposited 

 in the same uniform i plane, forming almost parallel layers of 

 various and varying dimensions, and undulating in gentle 

 curves. The general dip is at a very low angle from about 

 "W.S.W. to E.N.E. but increases inland. The Pre-Silurians, on 

 the contrary, exhibit uniformly a strike almost due N. — S., 

 with a very high angle of dip, viz., from 59° to 80°. 

 They, with granitic dykes, seem to form the core of the hill 

 ranges everywhere throughout the Hundred and the adjoining 

 region. Above them the older Tertiaries occupy the summits 

 of the coast hills, or fringe the inclines of those in the interior, 

 while the newer Tertiaries, with the most recent soils, either 

 occupy the highest plateaux, or fill the lowest depressions. 



The granites of Cunningham are probably co-eval with the 

 close of the Pre-Silurian period, the injections of which caused 

 the upheaval of the strata in such a way that their anticlines 

 were extensively exposed to denusive agencies. 



At "Winulta," somewhat beyond the northern boundary of 

 Cunningham, there occurs an exceedingly coarse conglomerate, 

 mixed with some sharp-angled fragments, adjoining the granite, 

 which here (for the locality) attains the greatest development. 



