66 Geology, ^c. of the Connecticut. 



No. 16. Reddish gray, friable, argillaceous sandstone 

 slate — Irregular, tortuous, disintegrating at the surface, a lit- 

 tle micaceous, containing numerous small specks of carbon- 

 ate of copper, and appearing to be an imperfect copper ore. 

 Thickness 4 feet, dip 40° 



No. 17. Hard, compact limestone — (No. 14.) Fracture 

 dull, containing a large proportion of silex, feebly efferves- 

 cing with the acids. Thickness of the stratum only a foot, 

 dip 48°, not divisible into layers- This very imperfect and 

 small bed of limestone is the only locality of limestone rock 

 I have ever found in the secondary ^region north of Hartford. 



No. IS. Gray, Micaceous sandstone slate — (No. 5.) Ir- 

 regular, tortuous and undulating, not as easily and as hand- 

 somely separating into layers as the red slate, resembling 

 some varieties of the mica slate, scarcely argillaceous. 

 Thickness 6 feet, dip 40°. 



No. 19. Same as No. 9. Thickness 12 rods, dip, 43^ 



No. 20. Coarse, reddish conglomerated sandstone — Con- 

 taining imbedded pebbles. Scarcely different from No. 13, 

 except somewhat coarser. Thickness 6 feet, dip 43°. 



No. 21. Same as No, 12. Thickness 3 rods, dip 43°. 



No. 22. Gray, micaceous, sandstone slate — Rough to the 

 touch, coarse, granular, scarcely argillaceous, not separating 

 into so thin layers as the red slates. Surface not undulating 

 or tortuous. Thickness 15 feet, dip 43°, An excellent flag- 

 ging stone. 



No. 23. (No. 9.) Soft argillaceous slate — Surface smooth, 

 scarcely undulating, divisible into thin plates, easily scratch- 

 ed by the finger nail, and consisting of little else than clay 

 moderately indurated. Thickness 5 feet, dip 45°, easily 

 disintegrated, rarely micaceous. 



No. 24. Gray micaceous sandstone slate — Similar to No. 

 22, but softer to the touch and finer grained, more undula- 

 ting and divisible into thinner layers, containing vegetable 

 remains converted into perfect coal. These were so numer- 

 ous in one spot, that I thought I had found a bed of coal, 

 Thickness 3 rods, dip 40°, 



No. 25. Geest—2 rods. 



/No. 26. Shale— Color very dark, containing sometimes 

 small scales of mica, surface a little knobby, containing 

 abundance of sulphuret of iron and spheroidal nodules from 

 half an inch to two inches diameter, oi argillaceous iron ore'i 



