The Shinumo Area. 511 



b. Calcareous blue slate. 



1. Slaty, black jasper, sun-cracked throughout. _ _ 12' 



2. Pink, crystalline limestone 1' 6" 



3. Slaty, blue jasper with small red spots 4' 6" 



Total 18' 



c. Cliff-forming jasper. 



1. Dense, hard layer of blue-black jasper mottled 

 with red spots, forming with the following 

 layer a strong cliff. ._ 14' 



2. Same as 1 with a soft slaty layer at the base 



which weathers out, giving the cliff an overhang. 3' 6" 



Total 17' 6" 



d. Sandy quartzitic jasper. 



1. Slaty, blue, spotted jasper _. _.._ 4' 



2. Fine-grained, pink quartzite, ripple-marked 5' 



3. Slaty, blue, spotted jasper 12' 



4. Fine-grained, pink quartzite 4' 



5. Slaty, blue, spotted jasper with sun-cracks 6' 



6. Fine-grained, pink quartzite, ripple-marked. _ _ 1' 



7. Pink, quartzitic jasper . 5' 



8. Fine-grained, pink quartzite 4' 



9. Fine-grained, pink, sandy jasper, sun-cracked _ _ 11' 



Total 52' 



e. Med and blue jasper. 



1. Banded, blue jasper with curious spots. Sun- 



cracked throughout _ 22' 



2. Red and black banded jasper 9' 



Total 31' 



f. At this horizon is intruded a sill of diabase, whose 



thickness varies from 650 feet on the Shinumo 

 to 950 feet or more in the Asbestos Canyon. 



The remainder of the section was measured in a traverse up 

 the Shinumo, starting with the npper contact of the diabase 

 sill. 



g. Blue slate and quartzite forming a cliff 20' 



h. Blue slate forming a slope 100' 



i. Red, argillaceous shale — sun-cracked throughout. 

 The rock is very soft and forms a slope together 



with the underlying blue slate ._ 91' 



j. Alternating, vermilion, argillaceous shale and sand- 

 stone. 



The alternations in this series occur with remarkable reg- 

 ularity . The sandstone is white in color and is compact and 



