164 GBOLOaY OF THE NAKJiAGANSETT BASIN, 



such as is cliaracteristic of the Coal Measures on the east side of Providence 

 Eiver. The rock exhibits a fissile structure, striking N. 25'' E. magnetic 

 (N. 14^ E.) and dipping 60'^ E. These figures give also, I believe, the 

 approximate attitude of the stratum 



TENMILE RIVER BEDS. 



The Coal Measures east of the Providence and Seekonk rivers as far 

 as the eastern bank of the Tenmile River afford characteristic exposures of 

 slightly altered sandstone, pebbly beds, and shales. Coal has been found in 

 the bed of Tenmile River, These strata may for reference be denoted as 

 the Tenmile River beds. The essential features of this horizon are set forth 

 in the following description of localities. If the beds on the west side of 

 the Seekonk and Providence rivers are, as the local structures indicate, in an 

 anticlinal relation with those on the east side of those streams, the meta- 

 morphosed shales and sandstone of the Cranston series are the equiva- 

 lent of the Tenmile River beds. For the present it seems best to consider 

 the beds as two geographical groups. The presence of the Odontopteris 

 flora and the insect fauna in the Tenmile River beds allies them, it should 

 be noted, with the metamorphosed strata at Pawtucket and Sockanosset, 

 and favors the idea that the two series are essentially at the same horizon, 

 though it is probable that the Tenmile beds do not, as does the Cranston 

 series, run downward to the base of the Coal Measures. (See fig. 17, p. 160.) 



LEBANON MILLS BXPOSUEE. 



A low outcrop in which there is a small quarry occurs on the west bank 

 of the Tenmile River at Lebanon Mills. The beds are conglomerates, 

 sandstones, and slaty shales, striking N. 48^ E. and dipping 70*^ S. One of 

 the slaty layers contains worm burrows and plant stems (Sigillaria, Cala- 

 mites), and the beds have here and there a reddish hue. The beds clearly 

 underlie those on the east bank of the river. 



BAST PROVIDENCE AREA. 



Tery good exposures occur in the southern part of the town of East 

 Providence, Rhode Island, in quarries near Leonards Corners, and particu- 

 larly along the shore of Narragansett Bay from Watcbemocket Cove south- 

 ward to near Sabins Point The strata in this area are in marked contrast 

 to the exposures on the west side of the Seekonk and Providence rivers, 



