326 Reviews — Geology of the Country around Noninch. 



flints, including the gigantic paramoudras, and the origin of the 

 large Chalk boulders of Norfolk. 



Most valuable lists of the Fossils of the Upper or Norwich Crag, 

 and of the Upper Chalk (revised by Mr. Robert Etheridge, F.R.S.) 

 accompany this memoir, and the Appendix gives a most complete 

 Bibliography of every paper relating to the geology of the county 

 (to which Mr. W. Whitaker, P.G.S., contributes). 



The formations noticed in the area described, or proved by deep 

 borings, are as follows : — 



Post-Gkcfal} Alluvial Deposits • • • j ^™keart^^^^^ 



f Gravel. 



I Boulder Clay. 



Pleistocene — Glacial Drift ^ Brickearth (laminated). 



I Sand and Gravel. 

 (^ Brickearth. 



Pliocene ... | Upper Crag-Norwich Crag 



I series (k 2). 



i Chalk (h 5). 

 Cretaceous < Upper Greensand (h 4). 



( Gault (h 3). 



The symbols (k '2) and (h 5) are engraved on the Map. 



No rocks older than the Cretaceous period have been proved in the 

 area; the possibility, however, of Carboniferous rocks (including 

 Coal-measures) being reached at a depth of about 1200 feet was 

 shown by the author when President of the Norwich Geological 

 Society in his Anniversary Address (Nov. 4th, 1879) ; see Geol. 

 Mag. 1880, Decade II. Vol. VII. pp. 72-78, and was illustrated by 

 a woodcut (p. 75), now reproduced in this Memoir. 



The Chalk of Norfolk is interesting as probably exhibiting higher 

 beds than occur elsewhere in England. The occurrence of remains 

 of Leiodon or Mosasaurus, a lacertian reptile, found also in the still 

 higher Cretaceous beds at Maestricht, in Holland, favours this idea. 



We are glad to see Sir Andrew Eamsay's remark that "in the group- 

 ing of the Glacial Beds the author has simply adopted a classification 

 applicable to the district, being of opinion that no general classifica- 

 tion can be established until the Glacial Beds are minutely mapped 

 over much larger areas.. This work is now in progress by the 

 Geological Survey. As it proceeds, we shall probably learn that 

 these beds are less complex than they appear to be, and that many 

 of the divisions have only a local value." Mr. H. W. Bristow, 

 E.E.S., the Senior Director, mentions the interesting fact that 

 Mr. Horace B. Woodward has surveyed and mapped the geology 

 on a copy of (the late City of Norwich Surveyor) Mr. A. W. 

 Morant's large majj of the City of Norwich, on a scale of five 

 chains to an inch. This large and valuable original map is to be 

 deposited, for reference, in the Geological Survey Office, 28, Jermyn 

 Street, S.W. 



Considering the excellence of the memoir, it is much to be regretted 

 that the eight lithographic plates of sections at the end have not 

 been executed in better style. They contrast most unfavourably 



