Geologt/, ^c. of the Connecticut. 67 



very similar to the shale containing the ichthyolite at Sun- 

 derland. Thickness 1 rod^ dip 40°. 



No. 27. Same as No. 24. 2 feet thick, dip 40.<* 



No. 28. A stratum of coarse grayish sandstone, or rather 

 'conglomerate, 2 feet wide, dip 40°. 



No. 29. Same as No. 24. Thickness 5 rods, dip 40". 



No. 30. Geest — 10 feet. It may be well, perhaps, here 

 to remark, that shale usually forms the roof and floor of coal 

 beds, and that this geest and that of No. 25 lie immediately 

 below shale. Connect this fact with another, " that the seams 

 or strata of coal rise up to the superficies of the globe as well 

 as all other strata, only they do not always push up so bold- 

 ly to the very surface of the ground as many hard stones 

 and other indurated strata are found to do ; for on account 

 of the tender and more friable texture of the coal, the super- 

 ficies of the stratum is often mouldered down and lies con- 

 cealed under a thicker or thinner bed or cover of clay, grav- 

 el, sand, or earth." (Williams Mineral Kingdom, Vol. 1. p. 

 135 2d edition.) If then coal can be found along the section 

 here described, (which I suspect to be quite doubtful,) the 

 best spots to search for it are Nos. 25 and 30. 



No. 31. Shale — 10 feet thick, dip 40°, containing abun- 

 dance of nodules o( argillaceous iron ore'? Rock rather hard 

 for pure shale, not liable to much disintegration. 



No. 32. Coarse, gray, sandstone or conglomerate — Rock 

 harsh to the touch, imbedded masses not large, layers thick. 

 Thickness two rods, dip 40°. 



No. 33. Same as No 24. Thickness 3 rods, dip 43°. 



No. 34. Shale — Alternating with, and passing into, a 

 bluish, gray, fine grained slate, harder than the shale, though 

 perhaps only a variety of it. A little micaceous. Thick- 

 ness 3 rods, dip 43°. 



No. 34. Blackish gray slate — Similar to that mentioned 

 tjnder the last No. but less fissile and much harder, indeed, 

 it breaks with nearly as much difficulty as greenstone, and 

 where it is worn by the water it somewhat resembles that 

 rock. For it contains numerous irregular cells, sometimes 

 two inches in diameter, formerly filled, probably with argilla" 

 teous iron ore'? On breaking the rock its structure is slaty 

 and it is a little micaceous. Thickness 2 feet, dip 40°. 



No. 36, Coarse grayish sandstone or conglomerate — like 

 No. 32, layers 2 feet thick. Thickness 20 feet, dip 40°. 



