Geological Society of London. 329 



The author stated that his investigations were confined to the 

 provinces of Calvados and La Manche, more especially the latter. 

 Having briefly alluded to the physical areas of the Bocage and 

 Cotentin, he proceeded to show that whilst the Secondary rocks were 

 confined to the Cotentin, the presence of several Palaeozoic inliers 

 proved that they were of no great thickness. He then briefly 

 described several sections illustrative of observations made by him 

 in walking over the Triassic districts of Valognes, Monteboui'g, and 

 Carentan, and of Bayeux in Calvados. The results arrived at (as 

 far as possible, despite the presence of drift concealing the Trias 

 almost everywhere) were that the Norman Trias is composed of 

 gravel, sands and sandstones, and marls. The gravels replace and 

 give place to sand and sandstone ; but the position of the marls 

 could only be distinctly ascertained near Carentan, where they 

 underlie sandstones. The gravels and sands either directly underlie 

 the infra-Lias, or are separated from it by a thin bed of marl. The 

 Norman Trias can scarcely exceed 200 feet in thickness. 



The author then briefly enumerated the Palaeozoic rocks of the 

 Bocage, and summed up the results of his investigations in the 

 following conclusions : — 



First, that the Tiiassic rocks of Normandy are the south-easterly 

 prolongation of the Triassic area of Somerset and Devon. 



Secondly, that Upper Keuper deposits are alone represented in 

 Normandy. 



Thirdly, that fragments of the Palaeozoic rocks of what is now 

 Normandy were never incorporated in the Triassic rocks of Devon. 



Fourthly, that the constitution of the coasts of Normandy, Devon, 

 and Cornwall is such as to justify a belief that varieties of Cambrian, 

 Silurian, Devonian, and Granitic rocks formed the bed of the Triassic 

 waters in the area now occupied by the English Channel, and that 

 to these sources fragments foreign to the Devonshire soil found in 

 the Triassic beds on the South-Devon coast are to be attributed. 



4. " On Foyaite, an Elgeolitic Syenite occurring in Portugal." 

 By C. P. Sheibner, Esq., Ph.D., F.G.S. Communicated by Prof. T. 

 M'Kenny Hughes. M.A., F.G.S. 



The name foyaite is derived from Mount Foya, in the south of 

 Portugal, where this rock occurs in the ancient province of Algarve, 

 intrusive in Devonian grauwacke, where it forms two dome-shaped 

 hills, the Foya and the Picota, rising respectively to 2968 feet and 

 2410 feet. The texture of the rock varies from fine to coarse- 

 grained, and is sometimes porphyritic. An almost compact variety 

 occurs cutting the coarser rock in dykes and veins. The coarser 

 rock occurs mainly on the southern slopes, where, however, the 

 adjoining grauwacke is less altered than elsewhere. The massif is 

 also cut by intrusive veins of phonolite and basalt of Tertiary age. 

 Much rock has probably been removed from the district by denu- 

 dation. 



Macroscopically foyaite consists of orthoclase, elgeolite, and 

 greenish hornblende. Orthoclase with imbedded ela3olite occurs 

 porphyritically. A lens shows titanite, biotite, magnetite, and 



