478 ADDRESS OF T. STERRY HUNT. 
to the Trenton and Hudson River formations. If we consult — 
Ramsay’s report on the region, it will be found that he speaks of — 
them as “probably Cambrian,” and states as a reason for that 
opinion, that they are connected by certain beds of intermediate 
lithological characters with strata of undoubted Cambrian age.* 
These, however, as he admits, present great local variations, and, 
after carefully scanning the whole of the evidence adduced, I am 
inclined to see in it nothing more than the existence, in this 
region, of Cambrian strata made up from the ruins from the great 
mass of pre-Cambrian schists, which are the crystalline rocks of 
Anglesea. Such a phenomenon is repeated in numerous instances 
in our North American rocks, and is the true explanation of many 
supposed examples of passage from crystalline schists to uncrys- 
talline sediments. The Anglesea rocks are a highly inclined and 
much contorted series of quartzose, micaceous, chloritic and epi- 
dotic schists, with diorites and dark colored chromiferous serpen- 
tines, all of which, after a careful examination of them in the 
collections of the Geological Survey of Great Britain, appear to 
me identical with the rocks of the Green Mountain or Huronian 
series. A similar view of their age is shared by Phillips and by 
Sedgwick, in opposition to the opinion of the British survey. The 
former asserts that the crystalline schists of Anglesea are “ below 
all the Cambrian rocks ;”+ while Sedgwick expresses the opinion 
that they are of “ a distinct epoch from the other rocks of the dis- 
trict, and evidently older.” 
Associated with the fossiliferous Devonian rocks of the Rhine, 
is a series of crystalline schists, similar to those just noticed, seen 
in the Taunus, the Hundsriick and the Ardennes. These, in opp°- 
sition to Dumont, who regarded them as belonging to an older 
system, are declared by Romer to have resulted from a subsequent 
alteration of a portion of the Devonian sediments. § me 
Turning now to the Highlands of Scotland, we have a similar 
series of crystalline schists, presenting all the mineralogical chat- — 
acters of those of Norway and of Anglesea, which, according t0 
Murchison and Giekie, are neither of Cambrian nor pre-Cambrian 
age, but are younger than the fossiliferous limestones of the wenke 
* LT ei X 
* Geol. of North Wales, pp. 145, 175. 
t Manual of Geology (1855) 89. 
t Geol. J lf 449, 
+ bd 
§ Naumann, Geognosie, 2d edition, IJ, 383. 
