226 Reviews — F. V. Hayden's U. S. Geological Survey Reports. 



Lower, Middle, and Upper Kimmeridge ; the Under, and Upper 

 Portland ; and Purbeck beds. 



The author gives first a short clear resume of the Geological 

 relations of each of the formations of the Upper Jura, and the 

 palaeontology of each of the groups into which he has subdivided 

 them. The Coralline Oolite and the Kimmeridge exhibit a rich- 

 ness in forms of life very different from anything these formations 

 present in our English rocks of the same age. 



The catalogue of the fossils out of the Upper Jura beds is very 

 instructive. The author has arranged the remains, consisting of 404 

 species, in a well-constructed table, which shows at a glance the 

 name of the fossil, the literature of the species, its distribution in 

 the different beds, and the locality in which it has been found. 

 This section of the work has been most carefully executed, and 

 conveys a large amount of information in a small compass. 



In the critical remarks upon the species enumerated in the 

 catalogue, the author appears to have exercised considerable dis- 

 crimination, and has pointed out his reasons for differing with many 

 of the determinations. He has added several new species, and 

 given beautiful figures of them in the eight plates which accompany 

 the work. 



The concluding section is devoted to a review of the correlations 

 of the Upper Jura of Hanover, to beds of the same age in the 

 Swabian, Swiss, and French Jura, and the substance of the author's 

 inquiry upon this branch of the subject is embodied in a number of 

 well-constructed tables, followed by a learned summary of the facts 

 they disclose. T. W. 



II. — Preliminary Eeport of the Field Work op the United 

 States Geological and Geographical Survey of the 

 Territories for 1878. By F. V. Hayden. (Washington, 

 1878.) 



THIS pamphlet contains a brief summary of the field work by the 

 Geological Survey of part of the Territories during the season of 

 1878, which, owing to the delay of the usual appropriation fund for 

 the work of the Survey, was of comparatively short duration, never- 

 theless much additional material was obtained. Four parties were 

 organized. To the first division was confided the primary triangula- 

 tion of the area to be surveyed. To the second was entrusted the 

 making of a detailed survey of the Yellowstone Park. This Park is, 

 in round numbers, 3,500 square miles. Its surface is in large part 

 level or rolling, with several groups and short ranges of mountains 

 diversifying it. In the eastern part, extending its whole length and 

 forming the water-shed between the Yellowstone and the Bighorn, 

 stand the rugged volcanic peaks of the Yellowstone Range. Nearly 

 all of the park is covered with a dense growth of magnificent pine 

 timber; indeed, west of the one hundredth meridian, there is no 

 area so densely timbered with the exception of Washington Territory. 

 The mean elevation of the park above sea-level is between 7,000 and 

 8,000 feet, which implies too cold a climate to admit of agriculture, 

 save in certain very limited localities. Except along the northern 



