40 Reviews—Geological Survey Memoirs. 
the small inlier of Carboniferous Limestone of Astbury with its 
volcanic tuff, an extensive development of the Pendleside Series and 
Millstone Grits, and the Coal-measures of the Biddulph Basin. East 
of the Red rock fault the whole area is occupied by Triassic rocks of 
the Bunter and Keuper divisions. ‘he whole district is more or 
less overlain by glacial deposits, but the high ground on the eastern 
margin of the map is comparatively free from drift. 
In the last edition of the Memoir on this area there was a small 
sketch-map of the district geologically coloured. The absence of this 
we regret in the new edition; we should like to see such a map in 
every memoir issued by the Survey. It is most useful for reference 
by the student of the memoir. All work in the area by local geologists 
has been duly acknowledged, and we note that the paleontology is 
almost entirely due to local workers. 
The area is an interesting one, and includes the western limb of the 
great Pennine anticlinal, and part of the Triassic plain which abuts 
against 1t. In the north-west corner of the map the surface of the 
land is 84 feet above O.D., while at Shutlingslow the top of the 
hill is 1,658 feet above O.D. 
In the area included in the map the Millstone Grits are thinning 
out rapidly from north to south and from east to west. In the north- 
east five beds of Grit can be made out, but at Mow Cop only two of 
them, supposed to represent the first Grit or Rough rock and the 
third or Roaches Grit, are found, and these much less thickly bedded 
than to the north-east. 
The area contains a very interesting patch of igneous rock well 
exposed in Astbury Old Limestone Quarry and the stream to the 
north. The north end of the quarry shows a large thick mass of 
agglomerate containing well-preserved fossils and blocks of marmorised 
limestone. In the southern part of the quarry beds of intrusive 
material, which have baked the shales above and below them, are to 
be seen intercalated in a shale and limestone series which forms the 
base of the Pendleside Series, and contain Prolecanites compressus and 
Trilobites and Corals belonging to Amplexizaphrentis and Cyathaxonia. 
We fail to find any account of this important fauna in the memoir. 
The chapter on the Pendleside Series is of interest, and we 
congratulate the author that he has wisely seen fit to include a large 
amount of palzontology in this part of his memoir. 
Kighteen pages are devoted to the Millstone Grit, and here, alas! 
we find no paleontological work, though the shales between the grits 
contain marine faunas. ‘l'welve pages only are allowed for a 
description of the Coal-measures, and two-thirds of a page is all we 
have on fossils and fossiliferous horizons in that field. In the chapter 
on the Trias (p. 59) we meet with the following statement: ‘‘ The 
district, however, affords evidence that this continental period 
(alluding to the Trias as ‘ this remarkable land period’) slowly passed 
away. and was succeeded by one of regional depression, during which 
the Midlands and a large portion of England sank once more beneath 
the ocean.”” Taken in conjunction with this we find on p. 65: ‘‘ The 
Jurassic deposits, which elsewhere conformably succeed the Trias, 
doubtless overspread the lower, if not the higher, parts of this area 
