GEOLOGY OF THE CONNECTICUT VALLEY DLSTRICT. 29I 



coralline limestones and easily-decomposing slates, standing upon their 

 edges. Associated with them, towards the coarse conglomerate, are 

 loosely-coherent sandstones resembling similar fossiliferous rocks in ad- 

 joining slates. On the west of the Helderberg there follows a half mile 

 width of vertical strata of the Lyman group, including the "Indian rock" 

 near the house of G. D. Shute. Between the top of the hill west and 

 Partridge pond, the Lisbon group succeeds. About the pond we find 

 the nearly-vertical slates, the northern prolongation of the Parker Hill 

 range, and also the Lyman group conglomerate. The Lisbon range 

 bordering this on the west again makes its appearance, with a greater 

 breadth ; and the copper is better developed than at some of the locali- 

 ties farther south, it having been worked slightly at the White Mountain 

 or Quint mine. 



The v/estern limits of this Oaint range are not well known. Near the 

 house of I\Ir. Little (E. Parker's) there are cupreous schists; and the clay 

 slate range must pass very near this site, since it occurs to the south, as 

 before mentioned, near the copper, and to the north quite extensively 

 about the West Littleton post-of^ce. In climbing the hill west of Little's 

 house, to see the principal copper mass, I do not recall this rock ; but my 

 attention had not been turned to it at that time, and it might have been 

 passed unheeded. At this opening the dip of the strata is 60° S. 70° E., 

 and the metalliferous schists are very abundant. Their course has been 

 followed a considerable distance in both directions, it being the main 

 vein of the Gardner Mountain deposit. From this opening across to the 

 Albee mine it cannot be more than half a mile. The strata with the lat- 

 ter vein dip 65° S. 40'' E., and nearer the house 70° S. 45° E. There is 

 said to be another bed of copper one hundred and twenty-five feet east of 

 the Albee mine, or nearer the Little mine. A comparison of these seve- 

 ral figures with each other suggests that the Albee veins would probably 

 coincide better with those nearest the ridge in Figs. 30 and 32, than with 

 those worked in the south part of Monroe, and those opened by Way 

 and Mason farther north. The mountain has diminished greatly in alti- 

 tude between Little's and Albee's, and falls gradually from those places to 

 Connecticut river; and the strata between the two sets of cupreous rocks 

 do not make an obvious anticlinal with each other, as is the case in Fig. 

 30. There would seem to be a growing tendency to an overturn in 



