BRinSH ISLES. 13 



mostly occupied by the Carboniferous rocks, with, near Donatrale and 

 Skerries, some L. Silurian rocks again. At the former locality, and 

 also at Lambay Island, are large masses of a dark green porphyritic 

 rock, hitherto believed to be a hornblendic greenstone ; but microscopic 

 examination has shown it to be a felstone porphyry, hornblende being 

 rarely if ever present. The Carboniferous Limestone in the neigh- 

 bourhood of Lough Shinny is contorted to an extraordinary degree. 

 Sections are given showing this. The Drift can be divided at Howth 

 and Killiney into L. Boulder Clay, Middle sands, U. Boulder Clay. Shells 

 have been got from the Drift on the Dublin mountains at heights of 

 from 1000 to 1200 feet above the sea. A raised beach is traced along 

 the shore in parts of the district. E. T. H. 



Evans, C. Excursion to Hampstead. Proc. Oeol. Assoc, vol. iv. no. 3, 

 p. 155. 



Evans, C. and J. L. Lobley. Excursion to lliddlesdown and Croydon. 



Proc. Oeol. Assoc, vol. iv. no. 5, pp. 282, 283. 

 Describes the subdivisions of the Chalk. 



Filby, Dr. [Geological recollections of a few weeks at Weymouth.] 

 Verhandlungen des Vereins fur naturivissenschaftliche Unterhaltung 

 zu Hamburg, 1871-74. 



Fisher, Rev. 0. Submerged Forests. Qeol. Mag. dec. 2, vol. ii. 

 pp. 283, 285. 



Remarks that the old stumps are always enveloped in or covered by 

 a mud containing Scrobicularia ; this proves submergence, a subsequent 

 elevation of 8 to 10 feet having occurred. W. T. 



Fordham, H. G-. On a Collection of Fossils from the Upper Green- 

 sand of Morden, Cambridgeshire. Proc. Oeol. Assoc, vol. iv. 

 no. 2, pp. 150-152. 

 The phosphatic bed is from 1| to 3^ feet thick. A list of fossils 

 collected at Morden and AshweU is given. As compared with those 

 from near Cambridge, the author notes that they are less perfect. 

 Echini and Crustacea are rare ; Belemnites abundant. W. T. 



Foster, Dr. C. Le N. Notes on Haytor L'on-Mine. Quart. Jown. 

 Geol. Soc. vol. xxxi. pp. 628-G30, 2 woodcuts. 



The iron-ore (magnetite) occurs in four beds interstratified with altered 

 shales and sandstones of Carboniferous ago. The beds strike E. 25° S. j 

 but the line of junction of the Carboniferous rocks and the granite 

 strikes here about N. and S. ; the granite has therefore broken across 

 the strata. Above one of the beds of magnetite is a thin vein of 

 granite, apparently interstratified, but which is proved on examination 

 to break across the rocks. The iron-ore perhaps originated in the 

 form of beds like the Cleveland ore, and has been altered into mag- 

 netite, the neighbouring rocks having become extremely silicified ; but 

 possibly the apparently stratified magnetite may have been formed 

 by ferruginous emanations. Actinolite and garnets are present, as 



