Vol. 68.] PAL.5:ozoic rocks of the kilbride peninsula. 87 



and the entire eastern and northern shores of the peninsula in the 

 neighbourhood of that hill. Bands of them strike with great per- 

 sistence through the woods of Barnarinnia. The lower beds are in 

 the main grey quartzose grits ; but fine dark grit-bands also occur 

 in the strip of ground that extends from Kilmore to Kilbride 

 Church. 



I^'orth of Kilbride Church the outcrop of the grit widens greatly; 

 this is due partly to a lower dip, but chiefly to the upper beds 

 being cut out by faulting in the Kilmore-Kilbride exposure. 

 The northern shore-line yields good exposures, and the grit- 

 bands succeed one another with great regularity. Occasionally, 

 however, there is evidence of disturbance in the form of bands of 

 breccia, and about 200 yards short of the extreme point there is 

 some folding. At the point the grit-bands are separated by very 

 thin partings of black shale, in which numerous fragments of badly 

 preserved graptolites have been found. Among these Miss EUes 

 has determined Monograi)tus vomerinus Mch. and 31. vomerinus var. 

 gracilis Elles & Wood. These beds are overlain south of the point 

 by grits, with occasional large calcareous concretions, these being 

 the highest beds in the district. 



Doon Eock Grits are also exposed along the eastern coast-line 

 almost as far south as Kilbride Eock, and in various scattered 

 exposures to the west of this line of coast. 



(b) The Barnarinnia Area. 



B,eference to the map (PI. VI) will show that the south-eastern 

 portion of the Kilbride peninsula is occupied by gneissic rocks, 

 against which the Silurian strata with a southerly and easterly 

 dip are faulted. From the shore of Kilbride Bay to a point about 

 a third of a mile north-east of the Doon Rock, Doon Eock Grits 

 with a south-easterly dip are faulted against the gneiss; but 

 farther east the other members of the Silurian series, with the 

 exception of the basal conglomerate, are all met with, the lime- 

 bostonite being also present. These rocks, which have in the 

 main a northerly dip, appear to represent part of the southern limb 

 of a big syncline, the northern limb of which is represented by 

 the main Silurian outcrop. They are, however, much faulted, and 

 are swung out of their normal line of strike. The badness of 

 the exposures makes mapping very difficult, and it is uncertain 

 whether the lowest member (the lime-bostonite) rests upon the 

 gneiss or is faulted against it. It appears that four cross -faults 

 traverse these rocks and the adjacent gneiss, dividing the Silurian 

 strata into four blocks. In the two westerly blocks lime-bostonite. 

 Red Sandstone, Annelid-Grits, and Calcareous Plags are all exposed, 

 but the Red and Purple Shales were not detected. In the third 

 block, counting from the west, only the lime-bostonite and the Red 

 Sandstone were seen. In the easternmost band the Red and Purj^le 

 Shale was exposed at two points (as indicated on the map). In 

 the western exposure the normal northerly dip occurs, but in the 



