GEOLOGY OF NEW HAMPSHIRE 55 
been designated the Calciferous mica schist, and it naturally 
completes the filling of the basin. This is the formation that was 
described in my Shelburne Falls section in 1858, with the same two 
divisions. There is a great development of rocks related to the 
lower division along the Connecticut Valley that were presumed 
to represent the lower part of the Calciferous, and they received 
the name of Coés group, consisting of a basal quartzite, mica- 
schists, hornblende-schists, staurolite-mica-schists and _ slates, 
several thousand feet in thickness. The early Canadian reports 
regarded the Calciferous schists as of Niagara age. Our report 
regards all these schists as the most modern of the stratigraph- 
ical column, but does not insist upon their identity with the beds 
carrying fossils. 
An important chapter would relate to the discovery of fos- 
sils in New Hampshire. They were found at Littleton in 1873 
and referred to the Lower Helderberg by E. Billings, paleontol- 
ogist to the Canadian survey. Later discoveries have proved 
the Niagara age of the enclosing rock, because of the presence 
of Halysites or chain coral and Pentamerus nystus. The rocks 
connected with the fossils are limestones, slates and sandstones, 
more like the Coéds bands than the Calciferous. They have 
been followed down the Connecticut to connect with the fossil- 
iferous limestone and sandstone of Bernardston, Massachusetts, 
belonging to the Devonian. Niagara fossils are also known from 
the west shore of Lake Memphremagog. 
The column thus established from structural evidence con- 
sists at the base of the porphyritic or Augengneiss followed by 
the Bethlehem or chlorite gneiss, and the ordinary lake gneisses, 
amounting to at least 28,000 feet in thickness, if foliz are to be 
esteemed capable of measurement. In the view of the report, 
the immediately ensuing 12,000 feet of gneissic-mica schists or 
Montalban occupied an intermediate place between the gneisses 
and the hydro-mica-schists. These last were subdivided in the 
Connecticut belt into the Libson chlorite schist, the Lyman 
argillitic (Urthonsclefer) schist and the auriferous conglomerate, 
in all 12,000 feet thick. In the central belt the triple classifi- 
