982 REVIEWS 



Areal Geology of Missouri (Mo. Geol. Surv., Vol. IX, sheets 1—4, 

 412 pp., 4 folio topographic and geologic maps, 24 plates, 

 53 figures. Jefferson City, 1896.) 



The volume includes four sheet reports: (i) Higginsville, 1892; 

 (2) Brevier, 1894; (3) Iron Mountain, 1894; (4) Mine La Motte, 

 1896. These reports were issued as independent reports for sep- 

 arate distribution, but for library uses are bound together in a single 

 volume uniform in style and size with the remaining volumes issued 

 by the present survey. H. F. B. 



Om kvartdra 7iivdfdrd7idringar vid Finska viken (On Quaternary 

 Changes of Level near the Bay of Finland) . By Gerard 

 De Geer. Sveriges geologiska undersokning Afhandlingar 

 och uppsatser ; No. 141, pp. 17. Stockholm, 1894. 



The author gives an account of some observations in 1893 on the 

 east coast of the Baltic. By studies in the field and by an examination 

 of the topographic charts made by the Russian government three 

 ancient shore lines were traced, extending around the east end of the 

 Bay of Finland and southward close to the German boundary. The 

 highest of these are referred to the " late-glaciaV age, the time of 

 recession of the Baltic ice. Northeast from Helsingfors it reaches an 

 elevation of 152 meters above the present level of the bay, but toward 

 the east and south it falls a little below thirty and twenty meters above 

 this level. There are indications that the province of Curland and 

 even Northern Germany were affected by the tilting which deformed 

 this beach. Its position is such that the lakes Peipus, Ladoga, and 

 Onega must have been arms of the Baltic at the time it was made. 

 Another series of terraces marks theAncylus stage of the Baltic. This 

 maintains an altitude of from 45 per cent, to 50 per cent, of that of 

 the late-glacial beach. A third well-marked beach line is referred to 

 postglacial times. This is the lowest of the three, having an elevation 

 of only four meters above the present level of the bay of St. Peters- 

 burg. To the west and north it rises to several times this height. 

 The occurrence of oak and the peccary in deposits inside of this beach 

 is referred to as evidence of a milder climate in an earlier postglacial 

 time. J. A. Udden. 



