SCIENTIFIC SURVEY. 357 



stratified slates and conglomerate, ranging in thickness from six 

 inches to two feet, varying in dip from west to north 60° west, 

 the angle being near 75°. The latter were probably the thinning 

 out of the thicker beds below, or the forces and material which 

 produced them must have become exhausted. From here we 

 rowed directly west across the lake to where we had observed the 

 rocks were exposed, and encountered a large island, which to- 

 gether with the neighboring shore, was made up of a greenish 

 colored, very hard, brittle rock, having a strong argillaceous odor, 

 without any traces of stratification, and traversed by a net-work 

 of joints. It looked so much like an altered rock that at first I 

 hesitated whether to call it trap or a metamorphosed schist. But 

 upon further investigation and a comparison of it with labelled 

 specimens, I have classed it with the former, and call it a dioritic 

 variety of greenstone. To the south-east of this, clay slate ap- 

 pears again, skirting the shore and forming embossed ledges. The 

 first determination of the dip we made was on an embossed rock a 

 few rods south-east of the trap island ; it was 15° north-west, and 

 we found by other measurements farther along, that the dip varied 

 little from this either in quantity or direction. Upon the rock first 

 measured there are striae having a direction of north 15° west. At 

 another place they have a direction of noi'th 10° west. 



Cauquomgomoc is a pretty little sheet of water set amid some of 

 the most beautiful scenery we have yet, since the commencement 

 of the trip, had the pleasure of viewing. It is surrounded ou 

 three sides by mountains and highlands, in some places coming up 

 to the water's edge, and at others retreatin,^ so as to leave a mar- 

 gin of comparatively level land. They begin just to the nortli of 

 the outlet, with a squat, rounded range, and running around to the 

 north and north-west, growing continually more varied and inter- 

 esting where lies the culminating point of the scene. The par- 

 ticular feature of beauty just here is the receding perspective of 

 ranges, each one overtoping those in front, until the last seems to 

 min°gle with and become lost in the ocean of blue beyond. The 

 clear, sparkling waters in front of you, with the receding series of 

 pine-clad highlands beyond, and over all a bright sun adding its 

 thousand touches of beauty, make a scene which once beheld is 

 not easily forgotten. The south-eastern shore is flat, and the 

 water all along this part of the lake is quite shoal. It was the 

 frequent remark of the guide while here, who was an old lumber- 



