Proceedings of the United States National Museum . Views of Rostrum and Mandibles of Ontocetus oxymycterus For explanation of plate see page U. S. NATIONAL MUSEUM PROCEEDINGS, VOL. 66, ART. 27 PL. 2. Views of Rostrum and Right Mandible of Ontocetus oxymycterus For explanation of plate see page 8 MINERALOGY AND PETROGRAPHY OF TRIASSIC LIME-STONE CONGLOMERATE METAMORPHOSED BY IN-TRUSIVE DIABASE AT LEESBURG, VIRGINIA By Earl V. ShannonAssistant Cnrator of Geology, United States National Museum INTRODUCTION The present article is intended to follow a preceding much length-ier paper on Triassic dia
Proceedings of the United States National Museum . Views of Rostrum and Mandibles of Ontocetus oxymycterus For explanation of plate see page U. S. NATIONAL MUSEUM PROCEEDINGS, VOL. 66, ART. 27 PL. 2. Views of Rostrum and Right Mandible of Ontocetus oxymycterus For explanation of plate see page 8 MINERALOGY AND PETROGRAPHY OF TRIASSIC LIME-STONE CONGLOMERATE METAMORPHOSED BY IN-TRUSIVE DIABASE AT LEESBURG, VIRGINIA By Earl V. ShannonAssistant Cnrator of Geology, United States National Museum INTRODUCTION The present article is intended to follow a preceding much length-ier paper on Triassic diabase at Goose Creek, Virginia.^ In thatpaper the diabase, which forms an intrusive sill-like mass severalhundred meters in thickness, is described in detail, and it was con-cluded that certain secondary minerals, among them datolite,prehnite, apophyllite, and certain zeolites, were deposited by mag-matic waters expelled by the diabase magma at the end of its con-solidation. Various hydrothermal effects of the magmatic solutionsupon the consolidated diabase were also considered. The followingdescription considers the case where these magmatic solutions,emanating from the crystallizing diabase,
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