414 Scientific Intelligence. 



the Lower or Comanche Series and the Upper or Exogyra costata 

 series ; and the lower of these has three divisions, the Trinity 

 (or lowest), the Fredericksburg and the Washita. The author 

 describes the several divisions, both of the Lower and Upper 

 Cretaceous beds in detail, mentions the characteristics fossils and 

 gives their distribution. Chalk, of varying purity, with and 

 without flints, is described as constituting a large part of the 

 Cretaceous of Arkansas as well as Texas, and especially of the 

 Upper Cretaceous. In the middle portion of the latter in Arkan- 

 sas, a bed of chalk is 500 feet thick. It is largely composed, 

 according to the observations (for the Arkansas Survey) of Mr. 

 J. S. Diller, of foraminifers, among which the genera Textularia 

 and Globigerina predominate. 



The Tertiary strata are chiefly those of the Lignitic series, the 

 Eo-lignitic of Heilprin. The beds are treated of in the report 

 under the local names of the Camden series, and the Cleveland 

 County red-lands. The latter overlie the Camden series and con- 

 tain Claiborne fossils. The Arkadelphia shales are at the base of 

 the Camden. Professor Hill also describes the Quaternary beds. 

 In later chapters he treats of the economical geology of the 

 region — its iron ores, marls and chalk, its forests and its mineral 

 springs. 



The report contains also a chapter on the northern limit of the 

 Mesozoic rocks in Arkansas by Dr. O. P. Hay, giving local details, 

 and another on the manufacture of Portland cement, by J. C. 

 Branner. 



4. -Jurassic Plants from ICaga, Hida, and JEchizen, {Japan) / 

 by Matajiro Yokoyama. Journal of the College of Science, 

 Imperial University of Japan, Vol. Ill, Part I, Tokyo, Japan, 

 1889. — This paper was announced three years ago in the Bulletin 

 of the Geological Society of Japan (Part B, Vol I, No. ], Tokyo, 

 1886), and a provisional list of the species given, of which the 

 author then enumerated 54. Thorough study has reduced the 

 number to 49, four of which had already been described by the 

 late Dr. Geyler from collections made by Dr. J. Rein in the valley 

 of the Tetorigawa, probably at Shinamura. This locality has 

 since been thoroughly re-investigated together with six others. 

 The flora shows a decided predominance of ferns, in which respect 

 it differs from the Mesozoic floras of India and of Siberia and 

 agrees better with that of the Yorkshire Oolite, but taking other 

 elements into consideration it seems upon the whole to have the 

 closest affinities with the Brown Jura of Siberia. The author refers 

 the Japanese deposits to the Bathonian stage of the Lower Oolite. 

 The paper is illustrated by fourteen litho-plates, in which the 

 figures are as good as those of many European works. A second 

 paper is promised on the Jurassic plants of the northern part of 

 Shinano. l. f. w. 



5. The Rivers and Valleys of Pennsylvania, by Wm. Morris 

 Davis, Nat. Geogr. Mag. i, No. 3, p. 103. — Professor Davis de- 

 scribes in this elaborate paper, the general topography of Penn- 



