170 GEOLOGY OF THE NAKBAGAISfSETT BASIN. 



Seekonk, The axis of this fold is probably that also of the great anticline 

 which Hes between the Attleboro syncline and the Great Meadow Hill svn- 

 cline. The axial plane is overturned to the north. On the northern side of 

 the cut, sandstones and conglomerates dip NNW. at an angle of 45^; in 

 the southern half, sandstone beds with fossiliferous shales dip SSE. at 

 angles from 30"^ to 15"^. There are no exposures at the point where the 

 anticlinal strata would be expected to connect the two parts of the section 

 in an arch, and evidence of an overthrust is wanting. 



Fossils. — Several species of plants have been found in a good state of 

 preservation in the shales. The fronds of a species of Odontopteris are 

 usually graphitized and shining. One layer in the sandstones is covered 

 with the impressions of large Pecopteris fronds matted together, but show- 

 ing the spore cases. The following fossils were found at this locality: 

 Cordaites sp., Pecopteris unita, Odontopteris sp., Oalamites sp. 



Bored well near i^ebanon Mills. — ^About half a mllc west of thc fossiHferous beds 

 above described, on the land of Mr. L. W. Bourn, a boring was made 

 about fifteen years ago. The hole reached a depth of 705 feet 4J inches, 

 the surface of the ground being about 90 feet above sea level. The upper- 

 most stratum underlies the shale section in the Perrins anticline. The 

 following strata were passed through, according to a copy of the record in 

 the possession of Professor Shaler: 



Geological column of diamond-drill hole made for the Seekonlc Goal Mining Company 

 on thmr anthracite coal lands, Bristol County, Massachmetts, under the direction of 

 Thos. S. Bidgway, geologist and mining engineer. 



Feet. Indies. 



Sand, gravel, and bowlders - 54 



Argillaceous slate, containing impressions of coal plants 4 



Siliceoas grit, alternating with argillaceous slates 13 6. 5 



Gray sandstone, micaceous, fine grained 9 9 



Glray sandstone, coarse and fine, alternating with red, bluish, purple, and 



oHve-colored variegated shales , 34 4 



Sandstone, compact, bluish, containing seams of slate 17 4 



Gray grit rock and sandstone, micaceous slates alternating 18 10 



Bluisln sandstone, micaceous, alternating with rock binds ^ lower part shaly, 



containing impressions of coal plants 17 



Gray micaceous sandstones, with layers of grit rock and slate 12 9 



Argillaceous rock and thin beds of sandstones with seams of slate 9 10 



