CONTENTS. 



PAGE. 



I. Notes on further Specimens from the Metamorphosed Dyke Series of Cape 

 Denison Nos. 142, 421, 432, 632, 633, 635A, 666, 1240 



1. Introduction 309 



2. Mineralogical Character of the Individual Xenoliths 310 



3. Genesis of the Xenoliths 313 



4. The Amphibolites of the Metamorphosed Dyke Series 313 



II. Notes on Additional Rock Types from Stillwell Island 



1. Introduction ... ... ... ... ... ... ... ... ... 312 



2. Petrography 



(a) The Garnet Gneisses Nos. 699, 980 313 



(b) The Acid Hypersthenic Gneisses Unrepresented 



(c) The Metamorphosed Dyke Series Nos. 972, 973, 974, 977, 976, 978, 59 317 



III. Additional Petrographic Notes on Rocks from Madigan Nunatak 



1. Introduction 321 



2. The Plagioclase-Pyroxene Gneisses Nos. 775, 783, 788, 792, 794 



(a) Modal Composition of the Rock 321 



(b) A Discussion of the Mineral Characters of the Rocks 322 



(c) Critical Analysis of Genetics of the Gneiss 325 



3. The Hypersthene-Alkali-Felspar Gneisses Nos. 778, 779, 787, 790, 791, 793, 



795, 797, 798, 1226, 1227, 1254- 



(a) Macroscopic Features 325 



(6) Mineralogical Characters 326 



(c) The Metamorphism of these Rocks 328 



4. Summary 328 



Description of Plates XLIV and XLV 330 



