2 SCIENCE PROGRESS. 



2. Applecross Group, 4000-5000 feet coarse arkose. 



1. Diabeg Group, 5000 feet and upwards red sandstones, 

 greywackes, shales, limestones, and calcareous bands. The 

 Diabeg group is further divided by Clough into four sub- 

 groups. 



In Ireland equivalents of the Precambrian and Lower 

 Palaeozoic rocks of Scotch type are gradually being mapped 

 in detail. Much information is given concerning the South- 

 ern Highlands of Scotland, including the discovery by 

 Barrow of radiolarian cherts in Forfarshire and Kincardine- 

 shire on the edge of the Highland border. Lamplugh has 

 shown that in the Isle of Man the " Skiddaw slates" are 

 everywhere folded, faulted, and sheared, and that the ap- 

 parent great thickness of these rocks in the island is there- 

 fore deceptive, a conclusion which seems to bear out a 

 similar statement previously made with regard to the 

 "Skiddaw slates" of the Lake District. In the Isle of 

 Man slates, coarse breccias are found, and these are 

 considered by Lamplugh to be friction breccias. In 

 Devonshire the Devonian rocks of the Plymouth area 

 have been brought into connection with those of Newton 

 Abbot and Torquay. One of the most interesting an- 

 nouncements in the report is that explorations in Cheshire 

 and South Lancashire "appear to prove that in both 

 counties the Lower Mottled Sandstone, hitherto taken as 

 the base of the Bunter, belongs to the Permian series, for 

 above it, and below the Bunter pebble beds, lie marls with 

 Schizodus" . No doubt all these points will receive fuller 

 treatment in detailed memoirs, and indeed a paper has 

 already been read, though not yet published, on the brec- 

 cias of the Skiddaw slates of the Isle of Man. 



Passing from Britain to her possessions, it is interesting 

 to have the mature judgment of the veteran Sir William 

 Dawson on various disputed points (2). Concerning the 

 Precambrian rocks he remarks that " the older gneissic 

 group of the West Highlands of Scotland does not contain 

 the whole of the Laurentian of Logan, the Lewisian of 

 Murchison, but only or mainly the lower part of it, the 

 Ottawa group of the Canadian Survey. A certain limited 



