Geology and Mineralogy. 



Its vigorous prosecution promises sc 

 cially desirable detailed informatioi 

 that State. 



4. Geological Survey of Illinois^ A. H. Worthed, Director. 

 Vol. VI. Geology and Paleontology : Geology, by A. If. Worthen 

 and Assistants, G. C. Broai>heai) and E. T. Cox; Paleontology,, 

 by O. St. John, A. H. Worthen and F. B. Meek. 532 pp., 

 roy. 8vo, with 34 plates. Springfield, 111., 1875.— This sixth 

 volume of the Illinois Geological Report commences with a chap- 

 ter, by Mr. Worthen, on the Coal-Measures of the State, which cover 

 35,000 square miles, and have a thickness of about 1,400 feet. 

 A detailed section, given on pages 2 to 5, includes 16 beds of coal, 

 large and small, with intervening marine beds, proving that each 

 era of terrestrial vegetation was followed by one of marine sub- 

 mergence and abundant marine life. This chapter on the Coal- 

 Measures is followed by others on the special geology of several 

 of the Counties of the State. 



Part II continues the reports on the Paleontology, 



descriptions and figures of a 



species of fossil plants, MoUusks, Crinoids, and Fishes, with 

 several of Corals, Crustaceans, Myriapods, Scorpions, Insects and 

 Amphibians. This new volume adds largely to the new species 

 of fishes and Crinoids, and somewhat also to those of MoUusks. 

 The contributions of the Survey, through its paleontologists, to 

 the departments of fossil fishes and crinoids greatly surpass all 

 that have been made by other State Surveys; and those of 

 Crinoids are unequalled by the publications of any other countrjr. 

 The number of new species of fishes described, from the teeth, m 

 this sixth volume alone, is over 100 (divided nearly equally be- 

 tween Hybodonts and Petalodonts, with one Cochliodont), and 

 besides these there are 45 species of fish-spines. The plates are 

 full of excellent figures beautifully engraved. 



Mr, Worthern states that with this volume the series of reports 

 closes, the "law-making power " desiring "to cut off all appropria- 

 tions not deemed by them absolutely necessary ; " but that there 

 are many fossils yet undescribed, including nearly all the corals 

 and bryozoans, and many common fossils. 



The Reports issued make a most honorable exhibit of the 

 liberality of the State ; yet the fact that the volumes are so full 

 and excellent in all respects excites the earnest desire that the 

 remaining volume should be issued which would make the series 

 complete. 



5. U. S. Geological Survey of the Territories under Dr. F. V. 

 Hatdex. (1.) bulletin No. 6.— This new Bulletin contains the 

 following papers : (1) An account of the various publications 

 relating to the travels of Lewis and Clarke, with a commentary 

 on the results of their expedition, by Dr. E. Coues ; (2) Notice 



