370 Revieivs — Geological Survey of Ohio. 



Eegis, Chauvet and A. A. Blair, and also Notes on the Geology of 

 Pilot Knob, by Prof. E. Pumpelly, the Director of the Survey. 



The second and larger part contains Eeports on the Geology of 

 Different Countries of North-western Missouri, by G. C Broadhead, 

 State Geologist, including five chapters on the Missouri Coal-field, 

 from which it appears that the Coal-measures of this State comprise 

 an area of about 23,000 square miles, chiefly situated in North-west 

 and Western Missouri, but including 160 square miles in St. Louis, 

 eight in St. Charles, and a few outliers in Lincoln and Warren 

 counties. They are divided into Upper, Middle, and Lower Coal- 

 measures; the Upper or barren Measures, which contain the thickest 

 groups of limestones, occupy about 8000 square miles, have an 

 aggregate thickness of 1300 feet, and include only about four feet of 

 Coal, of which there are two seams of one foot in thickness ; the 

 others are very thin seams or mere streaks. The Middle Coal- 

 measures are exposed for about 2000 square miles, and include a 

 total thickness of 324 feet, in which are embraced about seven feet 

 of Coal, including two workable seams of 21 and 24 inches, one 

 other of one foot, and six seams too thin to work. The Lower 

 Measures, mainly composed of sandstones and shales, are exposed 

 over 12,400 square miles, are from 250 to 300 feet thick, embracing 

 about five workable seams of Coal, varying in thickness from l^ft. 

 to 4|-ft., which, together with other thin seams and streaks, make in 

 all 13ft. Gin. of Coal. So that in Missouri it appears there is about 

 2000 feet of Coal-measures, with a total aggregate of 24ft. Gin. of 

 Coal. The volume contains nearly 200 illustrations, besides a report 

 on the Strength of Building Materials, Notes on Eocks which admit 

 of a polish, a List 'of the Fossils of the Coal-measures, a Schedule 

 showing depths of Coal-seams, and is accompanied by a large Atlas 

 of 14 plates, illustrative of the geology and other matters referred 

 to in the Eeport. J. M. 



IIL — Eeport on the Geological Survey of Ohio. Vol. L 

 Part 11. pp. 400. 48 Plates. (Columbus, 1873.) 



THE present volume contains the first part of the Paleeontological 

 Eeport of the Geological Survey, and according to Dr. Newberry, 

 the Chief Geologist (under whose auspices it is issued), the first illus- 

 trated memoir ever published on the fossils of the State, so rich as 

 it has long been known to be in beautifully preserved specimens from 

 the Silurian, Devonian and Carboniferous strata. Besides the Preface, 

 Dr. J. S. Newberry contributes an elaborate memoir on the classifi- 

 cation, geological and geographical distribution of the fossil fishes 

 found in the Paleozoic rocks of the State, with detailed descriptions 

 of the new or little known genera and species, including a very 

 large Placoderm {Dinichthys) allied to Asterolepis, and also notices 

 of some few of the fossil plants of the Coal-measures of Ohio, as 

 Cardiocarpon, Trigonocarpon, Bhabdocarpus, and a new genus of 

 ferns, Neriopteris, related to Tceniopderis, but which appears to have 

 some resemblance to the Jurassic genus Stangerites. In the section 

 on the origin of our Ichthyic fauna, Dr. Newberry remarks that in 



