374 Scientific Intelligence. 



89, 3 pis., 44 text figs. Chicago (University of Chicago Press), 

 1920. — In this work are described and illustrated a great many 

 minor folds, some of which are associated with thrnst-faults, 

 occurring in the neutral area of the United States^— neutral so far 

 as major folding is concerned — and more especially in the region 

 south of Lake Erie. Then are considered the various causes that 

 develop folds and faults, resulting in the conclusion that "All of 

 the larger and intermediate folds, and many of the smaller ones, 

 are thought to be due to widespread tangential stresses in the 

 rocks" (68). "The minor folds present most of the types com- 

 mon in major ones, though typical closed and recumbent folds 

 are absent. . . . Most of the folds and faults are the result of 

 widespread lateral compressive stresses; a few of the folds are 

 pre-Pleistocene, possibly Permian or later, a few very small ones 

 are Pleistocene, but most of them are post-glacial, and a number 

 are post-terrace" (81-82). c. s. 



8. Lithologic Suhsurface Correlation in the "Bend Series" 

 of North-Central Texas; by Marcus I. Goldman. U. S. Geol. 

 Survey, Prof. Paper 129-A, pp. 1-22, pi. 1, fig. 1, 1921.— This 

 short but striking paper blazes out a new line of research in the 

 study of buried sediments such as are so abundantly revealed in 

 deep-well drilling for petroleum. The great value of autoch- 

 thonous glauconite and phosphate as guides to ascertaining breaks 

 in sedimentation is here made plain, and a scientific method for 

 subsurface correlations in stratigraphy as well. The paper 

 should be studied by all students of stratigraphy. c. s. 



9. The Hadrosaur Edmontosaurus from the Upper Cretaceous 

 of Alherta; by Lawrence M. Lambe. Geol. Survey Canada, Mem. 

 120, 79 pp., 39 text figs., 1920.— This beautifully illustrated essay 

 from the pen of the late vertebrate paleontologist of the Geologi- 

 cal Survey of Canada is in many ways one of the most ambitious 

 papers which its author ever undertook. In it Lambe discusses 

 the extent of his material, and. under the head of "Osteology," 

 the detailed structure of the skull, mandible, the endocranial cast 

 (brain), vertebrae, ribs, and fore limbs. He then defines the 

 genus and species of which these specimens are the type, and 

 passes to a discussion of the family of unarmored plant-feeding 

 dinosaurs, the Hadrosaurid^e, of which so many new forms have 

 recently come to light as a result of the explorations carried on 

 under the auspices of the Canadian Geological Survey and of 

 the American Museum of Natural History. Lambe divides the 

 family into three subfamilies, two of which were proposed by 

 Barnum Brown of the American Museum. To these, the Tracho- 

 dontinae and Saurolophin*, Lambe adds a third, the Stephano- 

 saurinae. A table of comparisons with the older term Hadro- 

 saurin^, substituted for Brown's Trachodontinge, ^akes the 

 division clear, amplified by figures of the several types of skull. 

 This admirable work serves to emphasize yet further the irrepar- 

 able loss which American paleontology has suffered in the 

 untimely death of its talented author. "^ r. s. l. 



