132 Geological Society, 



White Chalk are of varying age, but generally referable to the above 

 two zones. The conclusion arrived at is that there was a gradual 

 depression followed by a partial elevation, and a subsequent depres- 

 sion of a far more pronounced character. The Central Division 

 being nearer the shore, the deposits of detrital material here formed 

 were thicker, but at the same time during the period of elevation 

 the denudation was more considerable, so that the unconformity is 

 very marked ; in the Eastern Division, where the sea is con- 

 sidered to have been deeper, the detrital deposits were not so thick 

 and denudation less pronounced ; on depression commencing at the 

 beginning of the Senonian period, limestones containing a Chalk 

 Rock fauna were being laid down here, while denuding influences 

 were still active in the Central area. Speaking generally, there 

 was a deepening northward of the Cretaceous Sea, but the high 

 ground in the north of County Antrim and south of Lisburn was 

 the cause of the very marked beach and conglomeratic features 

 observed in the Peninsular and Southern districts. 



IV. General Questions. — The author here touches on and dis- 

 cusses (i) the occurrence of certain organic remains in the glauconitic 

 sands and yellow sandstones of the Eastern division, which suggest 

 higher zonal conditions than those indicated by the species with 

 which they are associated ; (ii) the great development of the 

 Exogyra-columba beds south of Belfast and their feebleness north 

 of that town, while the opposite holds in the case of the strata 

 with /jioceraHMts-fragments and Spondylus speciosus ; (iii) cases of 

 unconformity and overlap in the series ; (iv) the existence of 

 definite beaches of Upper Chalk age ; (v) evidence in favour 

 of the influence of currents ; (vi) the relation of the Spongiarian 

 bands to the strata above and below ; (vii) faunal repetitions ; and 

 (viii) the general distribution of the Rhynchonellce and Terebratulce. 



2. 'An Account of the Portraine Inlier.' By C. I. Gardiner, 

 Esq., M.A., F.G.S., and S. H. Reynolds, Esq., M.A., F.G.S. 



At the north-western corner of the inlier a coarse conglomerate, 

 referred to the Old Bed Sandstone, dips in a north-westerly direction, 

 and from beneath it a series of green and purple audesites having a 

 south-easterly dip appear. These andesites have undergone con- 

 siderable change since their extrusion. They are succeeded by a 

 conglomerate of varied character, of which the matrix is at first an 

 ashy shale, including fragments of ash, andesite, shale, and lime- 

 stone. Interbedded with the conglomerate are bands of limestone 

 and shale, which have yielded fossils of Middle Bala facies. The 

 authors give reasons for maintaining that this conglomeratic series 

 is not due to earth-movement, but is a sedimentary accumulation, 

 though the case is otherwise with a conglomerate developed along a 

 thrust-plane which separates the volcanic series from an overlying 

 limestone. This conglomerate is compared with one recently 

 described in the Isle of Man, though the alteration which marks 

 the latter is practically absent from the former. 



Igneous rocks like those found to the north-west of the outlier 

 are also seen at the southern end. 



