314 GEOLOGY OF THE NABRAGAFSETT BASIN. 



Southward it seems to have ended in a fault, and both systems of infolding 

 seem to have been accompanied b)^ much subsidiary folding and faulting. 

 Fossil ferns are found in the carbonaceous shales north of Sheep Point, 

 especially at the promontories a little over a quarter of a mile north of that 

 point. Fossil oboli occur in pebbles at various points a short distance 

 north of Ochre Point. 



KEWPORT neck: and SOUTHERlsr CMFE ROCKS. 

 GREENISH ROCK IN THE CLIFFS SOUTHWEST OF SHEEP POINT. 



From the western side of the cove west of Ochre Point, along the 

 shore almost as far as Sheep Point, extends a series of black coaly shales, 

 having a general strike parallel to the shore and dipping westward at vari- 

 ous angles averaging about 50°. A short distance north of Sheep Point 

 a greenish rock occurs, whose nearest outcrops are within a few feet of the 

 coaly shale; but while the general trend of the black shales is about N, 20° 

 E , the hne of contact between the shales and the green rock runs about 

 N.45° E., as near as can be determined, and nearest the line of contact the 

 shales are much crumpled and the green rock has been so much sheared 

 that it slightly resembles a shale. At the southern end of the point the 

 shearing has ceased and the rock is seen to be in reality massive. Several 

 hundred feet south of Sheep Point, at one of the projecting angles of the 

 shore, the greenish rock has included a rather large mass of a rock which is 

 bluish and very fine grained when fractured, but which has a whiter and a 

 more stratified appearance where subjected to weathering. Macroscopically 

 it therefore has the appearance of a stratified rock much contorted and cleft, 

 the crevices being penetrated by the greenish rock. Fragments of a similar 

 rock occur farther southward and present at times an appearance very much 

 like that of a stratified rock. Their nature can be determined only by micro- 

 scopic examination. Dikes of a whitish or faintly pinkish apHte are also not 

 uncommon^ although occurring more commonly in the granite area farther 

 southward. In places the greenish rock presents the appearance of flow 

 structure. About three-eighths of a mile south of Sheep Point the greenish 

 rock is abruptly terminated by contact with a coarse-grained granite With 

 laa-ge phenocrysts of feldspar. The greenish rock here has a more evident 

 granular structure than usual and has the appearance of having once con- 



