RHODE ISLAND COAL MEASURES. 197 



schists along the shores of Narragansett Bay. It is probable that the 

 metamorphism of the beds along this anticlinal line has been greater than 

 elsewhere in the eastern part of the basin, or that lower beds are here 

 exposed. (See fig. 6, p. 120, locality B.) 



Eastward, outcrops appear in the vicinity of Scotland. About three- 

 fourths of a mile south of the town pebbly sandstones strike nearly E.-W. 

 and dip about 20° N., forming a low monoclinal ridge with an escarpment 

 facing the south. 



Beginning the description on the western border of the quadrangle 

 again, the beds on the south side of this broad anticline are represented by 

 a few exposures. The best of these is at a point near the western margin, 

 on the west side of Chartley Brook, about 2 miles south of the Attleboro 

 branch of the Old Colony Railroad. An old quarry here occurs in a knob 

 of the gray Carboniferous. The strike is N. 69° E., the dip 15° S., and 

 the following section is exposed from the top downward: 



Section in Chartley quarry. 



Feet. 



Gray sandstone witli small bands of pebbles and flattened sterns of plants, afford- 

 ing traces of coal 20 



Black, compact, argillaceous beds, slightly micaceous, containing worm burrows of 

 a scolitnoid habit; exposed 12 



scoiithus beds. — The worm burrows referable to Scolithus at this locality 

 are somewhat sinuous or often recurved burrows filled with material similar 

 to the micaceous rock of the walls. The tubes vary from an inch to a 

 quarter of an inch in diameter. "Where the wall has broken away from the 

 internal cast the surface is either smooth or rarely marked by minute cross 

 striations. The tubes are closely set, sometimes apparently in contact. 

 The depth of the burrow exceeds in most cases 2 inches, and is probably 

 much deeper, but, on account of the interlacing of the tubes, this point can 

 not easily be ascertained. There seems no sufficient reason for giving a 

 specific name to these forms, since they have no importance in indicating 

 horizons even within the limits of this small basin. 



One and a half miles east by north of this locality are outcrops of 

 compact argillite, succeeded on the south, near the head of Goose Brook, 

 by gritty sandstones containing distinct pebble bands, the dip of the last 

 being as steep as 80° S. These beds appear to be near the axial line of the 



