398 Scientific Intelligence. 



deformation which the area has suffered since the deposition of 

 the Cambrian, which has manifested itself in folding and fault- 

 ing, has been but slight compared with the pre-Cambrian defor- 

 mation ; and that the Cambrian rocks overlie the white limestone, 

 as well as the gneisses, unconformably. As a result of our obser- 

 vations, we are compelled to adopt the pre-Cambrian age of the 

 Franklin white limestone." h. s. w. 



3. West Virginia. Geological and Economic Survey. — Pro- 

 fessor I. C. White, the State Geologist, has issued a map of West 

 Virginia, compiled by Russell L. Morris, C.E., on the scale of 10 

 miles to the inch, on which are given the location of oil pools, 

 natural gas wells, and the approximate distribution of the New 

 River, Alleghany or Kanawha River, and Pittsburg coal areas. 

 The map is not complete, -but is issued as a preliminary one only. 



h. s. w. 



4. Alabama Geological Survey. Iron-Making in Alabama. 

 Second edition ; by William Battle Phillips, pp. 1-380, 1898. — 

 This is a second edition of the report published in 1896, contain- 

 ing new statistics regarding the products of the State. Several 

 new chapters have been added, among them additional informa- 

 tion as to the coal industry, compiled from the report by James 

 D. Hillhouse, State mine inspector. h. s. w. 



5. The Development of Lytoceras and Phylloceras, by James 

 Perrin Smith, Pro. Cal. Acad. Sci., 3d Ser., Geol., vol. i, pp. 

 129-160, plates xvi-xx, 1898. — The two genera Lytoceras and 

 Phylloceras are chiefly interesting " because they are simple, 

 unspecialized genera, long-lived, little changed, and yet with the 

 power of giving off other variable branches. They are the two 

 longest-lived genera of ammonites, ranging from about the end 

 of the Trias to the Upper Cretaceous, at least seven millions of 

 years by a conservative estimate." The author has prepared 

 beautiful plates illustrating the sutures of the protoconch and 

 following stages of growth ; and concludes from his studies that 

 "these two genera come from a common origin, and follow the 

 same paths up to Nannites, where they part company, each going 

 through a stage corresponding to that genus, but to different 

 species under it; both go through Monophyllites stages, but here 

 again analogous to different groups and even different subgenera. 

 There the resemblance ceases, and they develop into different 

 families probably by the middle of the Trias, for in the upper 

 division of that formation Megaphyllites and Monophyllites are 

 sharply distinguished from each other. In the life-history of 

 these two genera we have a rare opportunity of observing accel- 

 eration of development, and divergence of two nearly related 

 stocks, whose history may be traced from the Paleozoic to near 

 the end of the Mesozoic eras." h. s. w. 



6. Pre-Cambrian [gneous Rocks of the Fox River Valley, 

 Wisconsin; by S. Weidman (Wis. Geol. and Nat. Hist. Surv., 

 Bull. HI, Science, Series 2). — This is a geologic and petrographic 

 description of three areas of igneous rock, which appear to have 

 been islands during the deposition of Cambrian sediments. They 

 consist of an ancient rhyolite, a rhyolite changed to gneiss and a 



