viii CONTENTS. 



SUPERIOR SANDSTONES 413 



SECONDARY LIMESTONE 429 



SHALE 455 



OVERLYING ROCKS 464 



PlTCHSTONE... . 524 



PRELIMINARY REMARKS ON THE OCCA- 

 SIONAL ROCKS 538 



JASPER 544 



SILICEOUS SCHIST 557 



CHERT 564 



GYPSUM 571 



CONGLOMERATE ROCKS 574 



VEINSTONES.., . 587 



APPENDIX. 



VOLCANIC ROCKS 593 



CLAY, MARLE, AND SAND 606 



COAL 612 



ALLUVIA 619 



LIGNITE 635 



PEAT... . 639 



ADDITIONS AND CORRECTIONS. 



DIALLAGE ROCK 644 



SERPENTINE 652 



TABULAR VIEW OF THE CLASSIFICATION 655 



