Geology, ^rc. of the Connecticut, 79 



a pudding-stone, less coarse and more distinctly stratified. 

 Thickness, between two and three hundred feet. 



No. 4. (No. 9.) Red fissile argillaceoiis sandstone slate, 

 ten feet in perpendicular thickness. 



No. 5. Same as No. 1. Thickness ten feet — dip six de- 

 grees. 



No. 6. Same as No. 4. Thickness four feet. 



No. 7. Same as No. 1. except not so coarse, and more 

 distinctly stratified, agreeing nearer with No. 43 of the pro- 

 file. Thickness fifteen feet. 



No. 8. Same as No. 4. two feet thick. Where this rock 

 alternates with the pudding-stone the change is very strik- 

 ing. 



No. 9. Same as No. 7. Thickness fifteen feet. 



No. 10. Same as No. 4. five feet thick. 



No. 11. Same as No. 7. twenty feet thick. 



No. 12. Same as No. 4. graduating into the conglomer- 

 ate — ten feet thick. 



No. 13. Like No. 1. sixty feet thick. 



No. 14. Grey a7'gillaceous sandstone slate, sometimes 

 micaceous. Somewhat like No. 23. of the profile, but 

 coarser — liable to decomposition and containing many wa- 

 ter-worn pebbles. Thickness ten feet. This carries us to 

 the Sunderland cave. 



No. 15. Same as No. 4, fifteen feet thick. 



No. 16. Same as No. 1. about one hundred feet thick. 



No. 17. Same as No. 4. except that it is coarser and the 

 layers thicker — about ten feet thick. 



No. 18. A pudding-stone not differing essentially from 

 No. 1. but frequently of a reddish cast and more distinctly 

 stratified. This continues with little interruption to the top 

 of the mountain ; though the soil hides it in most parts, and 

 there may be other alternations which I did not observe. 



2. Jl Clam Shell? 



I found a specimen at the cave in Sunderland, imbedded 

 in an argillaceous slate, which resembles the common river 

 clam. There was a perfect substitution of siliceous matter. 

 A single specimen only was found, which was forwarded to 

 Mr. Brongniart, and he will be able doubtless to decide 

 whether it is a petrifaction or a peculiar water-worn pebble. 



