400 Scientific Intelligence. 
mica and hornblende wg staurolitic schist, quartzyte and other 
rocks, all lying confor y and alternating with one another; 
and that these rocks are ger ae in eee ON character to the 
mica and hornblende schists and quartzyte of the valley to the 
north; and, that part of them, as Pacieaeat Hitchcock asserts, are 
identical with his Cods slates, ‘indeed, so closely ar cage that the 
Bernardston mica schist is s made by him sara The r has 
Upper Silurian on its northeastern, northern, and all its western 
borders; and that the White Mountain region occupies the space 
between, Mt. Was ashington being not twenty miles east of Little- 
_ These conclusions are those of Sir William Logan’s a 
cal map.* 
latter to the Calciferous mica schist. = ain, 1 4 peotion between 
the parallels 43° 40’ and 43° 50’ the Montalvan chine and Beth- 
lehem gneiss are conformable, and the latter is made conformable 
in Moose Mountain with the staurolite schists of the Coos; and 
east of Hanover, this conformability is repeated, and the Coas is 
made conformable with the Hornblende schist, Lisbon group, clay 
slate; Calciferous mica schist, and the Cois farther west. Thus there 
is no evidence in the str atification, according to these sections, 
that the so-called Laurentian and Huronian are any older than 
the Cods and Calciferous mica schist of the panera valley ; 
* The statement on some of the maps—“Sillery, La s: Logan’s ar- 
rangement of the ii goions Huronian in Canada and Vermont” is sending to tines 
not familiar with the since Logan made these form “ Lower Silurian, 
and not ‘‘Upper ieocamen om and Mr. Hi —-* meant reese ce Leen subdivisions 
of what he himself refers to — ® Upper Huron 
+ This Journal, III, xiv, 
