The Shinumo Area. 507 



Character Thickness 



The upper part of the stratum has a paper-thin 

 bedding giving it the aspect of a calcareous shale. 

 The limestone weathers to a white powder. 

 Dendritic markings are present 2' 



3. Dense, homogeneous, white, crystalline lime- 



stone, forming a cliff. The upper part is thin- 

 bedded ._ 3' 8" 



4. Homogeneous, thin-bedded, white, crystalline 

 limestone containing occasional thin bands of 

 chert and nodules whose character suggest the 

 structure of Cryptozoon 8' 6" 



5. White limestone carrying a large amount of 



chert in undulatory and gnarled bands . 2' 4" 



6. Lumpy and gnarly, white limestone carrying 

 chert in large irregular nodules. Crumbles to 



a white powder _ 2' 6" 



7. Purple shale ._ 



8. Layers of undulatory-banded, bluish chert 1' 10" 



9. Soft, purple shale 5" 



10. Layer of gnarled and twisted chert nodules in a 



matrix of white talc. The surface of the talc 



is covered with dendritic markings 2' 



1 1 . Thin-bedded, white limestone crumbling to white 

 powder or weathering into thin plates like a 

 shale 2' 



12. Soft, purple shale _•__ 1' 



13. Thin-bedded, crystalline, white limestone 3' 10" 



14. Soft, purple shale 1' 10" 



15. Dense, blue, crystalline limestone forming a 



small cliff 3' 



16. Homogeneous, thin-bedded, white limestone, 

 crumbling to a white powder and weathering 



into plates like a shale __ 15' 



17. Dense, crystalline, blue limestone __ 4" 



18. Purple shale 3' 3" 



19. Layers of undulatory-banded, nodular chert in a 



matrix of earthy white limestone _ 3' 10" 



20. Thick-bedded layers of pure, homogeneous, 



white marble, forming the strongest cliff in the 



second member of the ITnkar 6' 8" 



21. Same in thinner beds 6' 6" 



22. Undulatory-banded, cherty limestone becoming 



crystalline above _ _ 10' 



23. Red shale below and purple shale above, sepa- 



rated by a thin layer of chert _ _ 5' 



24. Thick-bedded, crystalline, white limestone of 

 the same character as 20, forming a strong 



cliff 3' 6" 



