10 GEOLOGY. 



area are given. The author considers the conditions under which the 

 Cretaceous beds were deposited, referring largely to published works. 

 He regards the Phosphate-beds, which recur at intervals throughout 

 the Cretaceous series, as evidence of a continuous coast-line throughout 

 that period, from which it seems that shells were washed by currents 

 at times when changes of sediment (and consequently of fauna) were 

 taking place. W. T. 



Dewick, Eev. E. S. The Geology of Eastbourne and its Yicinity. 



Chap. vi. of ' Handbook for Eastbourne,' by G. F. Chambers. 6th 



edit. 8vo. London & Eastbourne, pp. 143-150. 

 Contains a list of fossils from the Cretaceous rocks of Eastbourne. 



Dickenson, J. On the Saliferous Strata. Trans. Geol. Soc. Man- 

 chester, vol. xiii. part ii. p. 23. 



Gives the results of his Report to Parliament on the state of landslips 

 caused by the working of salt, and classifies the Eed rocks of Lancashire 

 and Cheshire as foUows : — (1) Keuper or Saliferous [Marl], with thin 

 beds of limestone and 210 feet of rock-salt, 600 feet ; (2) Lower Keuper, 

 or Red Marls, with two beds of variegated sandstone, 500 feet ; (3) 

 Bunter, or Upper Red Sandstone, 900 feet ; (4) Red Marls, valley of 

 Irk, 210 feet, and Lower New Red Sandstone (Permian), 600 feet. 



Mr. Dickenson suggests that the Permian Red Marls, sunk through 

 in Hafod-y-bwch Colliery, Denbighshire, are in reality Carboniferous ; 

 he refers to the fact that the salt of Middlesboro' occurs at a depth of 

 300 yards beneath Red Sandstone, and believes that the streaked mark- 

 ings in the Marlstone were due to the sliding of overlying beds caused 

 by the melting and flowing away of the salt to the sea. C. E. De R. 



Egan, E. W. Explanatory Memoir to accompanying Sheet 47 of the 

 Maps of the Geological Survey of Ireland, with Palaeontological 

 Notes by "VY. H. Baily. Pp. 57. 8vo. Dublin. (EiveVoodcuts, 

 sections, and view.) [Published in 1874, though dated 1873.] 



The ground is gently undulating, rising to 819 feet south of Armagh ;. 

 the low grounds to the north around the Bann, Blackwater, &c., are 

 covered with bog ; and those rivers convey all the drainage into Lough 

 Neagh. The formations are : — Bog, Alluvium, Drift, Miocene Clays, 

 Keuper, Bunter, Permian Breccia, Lower Carboniferous, Lower Silurian 

 (Caradoc or Bala), Basalt, Dolerite, and Eelstone. 



The limestone near Armagh affords some beds of handsome marble, 

 extremely fossiliferous. Near the town occur Permian breccias (boulder- 

 beds and conglomerates), described by Prof. Hull, and referred to the 

 Lower Permian. * The boulders appear to have been deposited by float- 

 ing ice. Permian beds are also found on the Blackwater, near Ben- 

 burb ; and these are the only Lower Permian beds yet observed in 

 Ireland. The Triassic beds occupy a considerable area in the north 

 and west of the district, and underlie the city of Armagh, but are well 

 exposed only in isolated localities. At the north a Tertiary lacustrine 

 deposit of clays, with a little sand, is found, being the continuation of 

 the clay-beds of Lough Neagh. Sometimes good white pipeclay is got, 



