ILLUSTRATIONS IX 



TO FACE PAGE 



63. Cambrian Trilobites (Asaphiscus) 448 



64. " " {Blountia, Maryvillia, Corynexochus, 



and Dorypyge) 450 



6e. " " (Dolichometopus, Bathyuriscus, and 



Marjumia) 452 



66. " " (Ogygopsis, Orria, and Lisania) 454 



67, " '• (Pagetia) 45^ 



TEXT FIGURES p^^^ 



Fig. I. Section, Sinian system, Ch'ang-hia district, Shan-tung 51 



2. Section, Sinian system, Sin-t'ai district, Shan-tung. ... 52 



3. Section, Sinian system, south of Tung-yij, Shan-si. ... 53 



4. (Blackwelder) . — Ch'ang-hia, Shan-tung. Section, 



Cambrian strata, Man-t'o butte .... 54 

 5 and 6. " Yen-chuang, Shan-tung. Section, 



Cambrian strata, Kiu-lung-shan. .54-55 



7. " Ch'au-mi-tien, Shan-tung. Section, 



Upper Cambrian and Lower Ordo- 

 vician 55 



8. " Yen-chuang, Shan-tung. Section, 



Kiu-kmg formation 55 



9. Correlation table, fossiliferous sections measured by 



Willis and Blackwelder 57 



10. Big Belt Mountains — Helena Section, unconformity 



between Cambrian and Pre-Cambrian 263 



11. Unconformity between Cambrian and Pre-Cambrian, 



Grand Canyon, Arizona 283 



12. Unconformity between Helena limestone and Cambrian 



Flathead sandstone 286 



13. Unconformity between Marsh shale and Cambrian 



Flathead sandstone 286 



