MEETINGS, 269 



cutting in some places is 8 feet deep. The sand is almost 

 pure; the clay is always more or less sandy, but the layers 

 are quite distinct and do not graduate into each other. There 

 are numerous interstratified layers of each kind, but the 

 stratification is irregular and shows remarkable contortions. 

 The decomposed rock is pseudo-stratified as if from pressure. 

 The layer immediately resting on the rock is sand, 16 inches 

 in thickness, with a few angular stones at the base similar to 

 undecomposed veins in the underlying rock. The relations 

 of the sand and clay are very similar to what is found at 

 Vrangue Brickfield southern excavation, but the elevation 

 above sea level is, of course, much greater, and no pebbles 

 have been found. The spot where these deposits are best 

 seen is at the angle of the two new roads. To the south and 

 east the deposit thins rapidly, and the decomposed rock 

 comes to the surface. 



PEBBLES IN SOIL. 

 Mr. Collenette having in some of his papers and lectures 

 referred to the abundance of pebbles in the soil and in the 

 clay immediately below it ; these have been looked for and 

 found in many localities at all elevations. Their significance, 

 however, is not insisted upon. 



ROCKS. 



The schistose rock at Pezeries, Torteval, believed to be 

 that referred to in M. Noury's work on the Geology of Jersey 

 as similar to the Jersey argillites, has been visited. It is 

 referred to also in Mr. Hill's paper on the Geology of this 

 island, but as an intrusive vein. The latter is undoubtedly 

 the true nature of the rock in question, which has a marked 

 structure suggestive of stratification, but more probably due 

 to fluxion, dipping E. about 40°, the strike of the vein being 

 N. to S. The rock is somewhat soft, being easily scratched 

 by steel or iron. It is very wide, perhaps the widest in Guern- 

 sey, and is bounded on either side by granitoid gneiss, which 

 appears altered at contact. Its width, as measured roughly 

 on the beach, may be from 300 to 400 feet, which would give 

 from 200 to 250 for the true width at right angles to its dip. 



The rock at Fort Gray, supposed to be that called argil- 

 laceous schist by MacCulloch and referred to by other 

 geologists has been also examined. It is a soft rock, not 

 unlike shale in some parts, but does not appear to be intrusive 

 like the Pezeries vein, although it corresponds with it in strike 

 and also dips K, but at a greater angle. It graduates into 

 the adjoining dioritic or syenitic gneiss and seems to be due 



