524 Reviews — Geology of Newton Ahhot, South Devon. 



Lilleshall water supply, and several of the stones thrown out were 

 found to be beautifully wind-worn and polished. Two trial excava- 

 tions made near by yielded a considerable proportion of wind-worn 

 stones embedded in fine soft red sand. 



In one of the excavations carried to a depth of 29 inches there also 

 occurred immediately beneath the turf a definite layer of white even- 

 sized wind-worn sand, the grains measuring about -gVinch in diameter, 

 above the fine red sand with wind-worn stones. 



The occurrence of wind-worn stones is also recorded from other 

 localities in the Midlands, and specimens in illustration are exhibited. 



9. Plant Petrifactions in Chekt and their bearing on the 

 Origin of Freshwater Cherts. By Marie C. Stopes, D.Sc, Ph.D. 



THE author described, and illustrated with photos, petrifactions of 

 plants in the freshwater cherts of Lulworth (Purbeck) and Asia 

 Minor (Tertiary). The author drew special attention to the Asia 

 Minor cherts, which are remarkabh' interesting and contain well- 

 preserved plant debris. These were described by Mr. Haydon in his 

 presidential address to the Liverpool Biological Society, but his work 

 seems not to have reached most geologists and palseobotanists. The 

 cherts contain beautifully preserved pollen grains, fungi, stem debris, 

 etc. ; and the existence of these delicate soft tissues so well preserved 

 suggests that Sollas's view of flint formation can only be applied with 

 caution to these freshwater cherts. 



The author drew attention to the recent ' Sapropel ' observed by 

 Potonie, and the likeness it has to the debris in the Asia Minor chert ; 

 concluding that the chert may be taken as practically pure petrified 

 ' Sapropel', a phenomenon which must interest those who are concerned 

 with the methods of plant petrifactions. 



I?,E3"VIE]""77'S. 



I. — Geological Survey of a part of Sodth Devon. 



The Geology of the Country around Newton Abbot. By W. A. E. 



TJssher, F.G.S. ; with contributions by Clement Reid, E.ll.S., 



J. S. Elett, D.Sc, E.R.S., and D. A. MacAlister, A.R.S.M. 



8vo ; pp. yi, 148, with 3 plates and 14 text-illustrations. London : 



printed for H.M. Stationery Office, 1913. Price 3s. 



rilHE country described in this memoir is a highly interesting and 



jL picturesque portion of South Devon, wherein are to be seen the 



fossiliferous Devonian limestones of Bradlej^ Woods and elsewhere near 



Newton Abbot, and other Devonian strata with interbedded and 



intrusive igneous rocks ; the Culm Measures with chert-beds and 



fossiliferous shales at Waddon Barton, near Chudleigh, and intercalated 



igneous rocks to the west, including portions of the Dartmoor granite 



at Lustleigh. Then the coast is dominated by fine cliffs of Bed Rocks, 



ranging in upward succession from the Permian terra-cotta clay of 



Watcombe through the bold masses of conglomerate and breccia, 



sandstone and marl which extend to Teignmouth, Dawlish, and 



Exmouth. Beyond is the famous Bunter pebble-bed of Budleigh 



