570 Hevieus — Geologi/ of Dorchester. 



intersected by diabase dykes and with a fringe of Lower Palaeozoic 

 and Mesozoic rocks along the southern coast. The stratified rocks 

 include Cambrian sandstones and ' schiefer ' ; an Ordovician 

 Ortlioceras limestone ; Trinuclens and graptolite shales ; and some 

 Silurian graptolite beds. The Upper Palaeozoic is unrepresented. 

 Of the Neozoic series there are only a bed of Lias and a Lower 

 Senonian Greensand and Chalk. The glacial beds are important,, 

 and are interpreted as belonging to two Glacial epochs — a first 

 period of complete glaciation, and a second glaciation in which ice 

 occurred only on the low-lying borderlands of the island. 



The guide to Bornholm is accompanied by a clearly printed 

 coloured geological map on the scale of 1 : 100,000. 



Professor's Deecke's guide to Pomerania is necessarily briefei* 

 and less complete than his little monograph on Bornholm. The 

 geological series in Pomerania includes beds of Lias, Dogger 

 (Bajocian and Callovian), Kimmeridgian, Cenomanian, Turonian, 

 Senonian, Oligocene, and Miocene. Probably the most important 

 member of this series is the Schriebkreide of Campanian age 

 (Mucronatus zone) of the island of Eiigen. The principal Cretaceous 

 sections on that island are described, and a map of north-eastern 

 Eugen is a further guide to the best collecting-grounds. The glacial 

 deposits belong to two series, the first being the puzzling Drifts of 

 the Island of Kiigen, whose origin and relations have been a vexed' 

 question in North German glacial geology from the days of Lyell's- 

 description in 1837 until the recent papers of Professor Bonney and 

 Mr. Hill. The second group of glacial deposits belongs to the great 

 terminal moraine of the Baltic Plain. 



Professor Deecke is to be congratulated on his guides, which will 

 be useful to geologists and tourists and especially to geological 

 teachers and their students. 



Memoius of the Geological Survey. 

 IL — The Geology of the Country around Dorchester. By 

 Clement Reid, F.R.S., etc. 8vo ; pp. 52. (Printed for H.M, 

 Stationery Office, Loudon. Price Is.) 

 ri'^HIS Memoir, which is intended to accompany the New Series- 

 jL Geological Survey Map, No. 328, deals with the subject muchi 

 more fully than do the previously published Memoirs by the same 

 author on the Geology of Bognor, Bournemouth, and Eastbourne. 

 This is as it should be. In such Memoirs we look for a fairly 

 complete account of the geology of the area included within each- 

 Survey map, and for a record not only of what the Survey geologists 

 have done, but of what others have done also. 



Upper Jurassic rocks and Wealden beds occupy a very small 

 portion of the area described in the work before us ; the Upper 

 Cretaceous, Tertiary, and later deposits form nearly the whole of 

 the ground. 



The Gault and Upper Greensand are grouped together, imder 

 the name Selbornian (as used by Mr. Jukes-Browne) ; and these- 



