xvi DEPARTMENT OF THE INTERIOR 



2 GEORGE V, A. 1912 



Page. 



Pasayten volcanic formation 489 



Lightning Creek diorite 490 



Other basic intrusives cutting the Pasayten formation 491 



Castle Peak stock 492 



Its special importance 492 



Dominant phase 493 



Basic contact phase 494 



Structural relations 494 



Intrusion of syenite porphyry 499' 



Petrography 500 



Correlation 500 



Hozomeen series 500 



General description 500 



Correlation 502 



Structural relations in the range 504 



Correlation 505 



Summary of geological history 506 



CHAPTEE XVIII. 



Formations of the Skagit mountain range 507 



General statement 507 



Stratified formations . 508 



Hozomeen series 508 



Chilliwack series 508 



General character and distribution 508 



Detailed sections and the fossiliferous horizons 510 



General columnar section. . . 514 



Geological age of the series 514 



Cultus formation 516 



Stratigraphy and structure 516 



Fossils 517 



Tamihy series 518 



Huntingdon formation 519 



Igneous-rock formations 521 



Chilliwack volcanic formation 521 



Vedder greenstone 522' 



Custer granite-gneiss 523 



Original rock-type 524 



Banded structure 524 



Sumas granite and diorite 526" 



Granite 526 



Diorite 52T 



Skagit volcanic formation 528 



Skagit harzburgite 531 



