Xiv CONTENTS. 



PALEONTOLOGY OF THE BLACK HILLS, BY E. P. WHITFIELD. 



Page. 



Chapter VI.— Paleontological Report on the Fossils Collected 329 



Section I. Preliminary remarks 329 



II. Fossils from the Primordial rocks 331 



III. Fossils from the Jurassic rocks 344 



IV. Fossils from the Cretaceons rocks 383 



V. Synopsis of species from the Black Hills, noticed in other works, 



not described in this report 460 



VI. List of fossils described in this report 465 



MICROSCOPIC PETROGRAPHY OF THE BLACK HILLS, BY JOHN H. CASWELL. 



Chapter VII.— Microscopic Petrography 471 



Section 1. Quartzites 471 



n. Mica schists and slates 476 



III. Rhyolite, trachyte, and phonolite 483 



BOTANY OF THE BLACK HILLS, BY ASA GRAY. 



Chapter VIII.— Botany 531 



ASTRONOMY AND BAROMETRIC HYPSOMETRY OF THE BLACK HILLS, BY HORACE P. 



TUTTLE. 



Chapter IX. — Astronomy and Barometric Hypsometry 543 



Section I. The astronomical work 543 



II. Magnetic variation 547 



III. Barometric work 547 



Table of positions and altitudes of camps and other points 551 



IV. Supplement 554 



