352 Description of the Bare Hills. 



9 



Besides, there are several other kinds of " accessory minerals" 

 entering, as will appear hereafter, as constituents, into the composi- 

 tion of almost the entire mass of these rocks, and which may be 

 seen by a superficial observer- 

 Having noted the general features of the Bare Hills, I shall pro- 

 ceed to designate and point out, upon the accompanying sketch, the 

 localities of all the different minerals which, as far as I know, have 

 been found in this district. To effect this object, and to determine . 

 their relative distances, it becomes necessary to establish a certain 

 fixed point or points of departure, from which the several admeas- 

 urements were taken, in yards or paces. 



My first point of departure is at the southern extremity of the wall 

 of the bridge on the east side at A. From this point south at the 

 distance of twenty yards, a small foot path leads from the road down 

 the hill in an easterly direction. At the distance of ninety yards 

 from the turnpike road, and at the base of the hill by the side of the 

 path mentioned, the rocks jut out of the hill, and present a remarka- 

 ble instance of the. admixture of" accessory minerals," which con- 

 stitute ophiolite. It is composed, principally of serpentine and gran- 

 ular felspftr. 



At B, twenty four yards south from A, an excavation was made 



at the base of the rocks, as they break out of the hill, to carry 

 away the water that descends from the hill in a trench cut by the 

 road side. At the point where the water turns from the road to pass 

 off down the hill, and at the bottom and sides of the excavation, we 

 find, on removing the debris and sand that have been deposited by 



heavy 



schistic ophiolite. It is 



composed of interrupted layers of serpentine felspar and magnesia. 

 On removing carefully the laminae of serpentine, the surfaces both of 

 the felspar and serpentine exhibit, upon a white ground, a very 

 beautiful arborescence, probably of manganese. 



Some of these specimens are not surpassed in delicacy, and 

 beauty of delineation, by any thing of the kind that has been found 

 in this State. These arborescent appearances are common among 

 the rocks of Bare Hills ; but this locality furnishes the greatest number 

 of beautiful specimens. Still ascending the hill to the south, on the 

 east, or left hand side of the road at C, and distant from A, sixty 

 two yards, we discover running into the hill, a vein, or almost a dyke, 

 of beautiful white acicular asbestos, four or five feet in thickness. 

 This locality is rendered the more interesting, as in breaking open a 



