272 Reviews — Geological Survey oj England and Wales. 



introduped which have not been actually proved to exist withiiir 

 the area. 



Table of Strata fok the Isle of Man. 



Eecent 



Glacial 



Triassic 



Permian 



Carboniferous . . 

 Upper Cambrian ? 



Fresh-water. 



i Blown sand. 

 Peat. \ 



Alluvium. ) 

 V Eaised Beacli. Marine. 

 Late Glacial Flood- Gravels. 

 Sand and Gravel occurring as platforms. 

 Sand and Gravel occurring as mounds. 

 Boulder-clay or Loam, and Eubble Drift. 

 Great Unconformability. 



( Eed Marls (saliferous) . ^ 



\ St. Bees Sandstone. 

 Lower Marls and Brockram. ; 

 Great Unconformability. 

 i Carboniferous Limestone Series. 

 ( Basement Sandstone and Conglomerate. 

 Great Unconformability 



Proved in deep borings beneath 

 the drift-plain at the northern 

 end of the island. 



Manx Slate Series { jy^l^ed^mto 



Contemporaneous. 



Barrule Slates. 

 ' Crush Conglomerate.'' 

 Agneash and other Grits. 

 Louan and Niarbyl Flags. 



Carboniferous 



Igneous Eocks ...< 



{ Tuff Agglomerate, etc. 

 ■ ( Basalt. 

 Manx Slate Series. Tuff (small patches near Balby only). 



Intrusive. 

 Olivine Dolerite (Tertiary ?) dykes. 

 Diabase, etc. ('Greenstone') dykes. 

 Diabase, Epidiorite, Chlorite schist, etc. ( ' Altered Greenstone' ), 



dykes. 

 Diorite and Camptonite dykes. 

 Mica-trap dykes. 

 Microgranite dykes. 

 . Granite. 



The geological maps of the island, of which Mr. Lamplugh's 

 memoir contains a very full and admirable description, are issued in 

 two editions, one with and the other without the Drift. 



Besides the chapters of topographical details regarding the rocks 

 of the island which are arranged to serve as a geological guidebook 

 to those in search of local information, the work contains general 

 chapters in which a broader method of treatment is adopted and 

 prominence is given to the phenomena of more than local interest. 

 Thus, the descriptions of the physical features of the island, of the 

 ' Crush Conglomerate ' and other curious rock structures and types 

 of folding produced by earth-movement in the Manx Slates, of the 

 disturbance of a different character exhibited by the Carboniferous 

 rocks, of the structure of the Irish Sea basin as revealed by deep 

 borings in the north of the island, and of the condition of the 

 island during the successive stages of the Glacial Period, — all contain 

 matter of wide geological interest. The chapters on the petrography 

 of the great variety of most interesting igneous rocks and of those 

 of sedimentary origin have been prepared by Professor W. W. Watts. 



