250 Notes on the Glaciation of the Pacific Coast. [March 
Silurian, we find Emmons, in 1842, suggesting that the Taconic 
rocks in part might “be equivalent to the Lower Cambrian of 
Sedgwick,” “the upper portion being the lower part of the 
Silurian System,” to which the Middle and Upper Cambrian of 
»Sedgwick were then, on the authority of Murchison, very gen- 
erally referred. To repeat what we have already said, we add 
that this upper portion, the fossiliferous character of which he 
made known in 1844, was by Emmons declared, in 1860, to cor- 
respond to the Primordial of Barrande. “The upper part of the 
Taconic is equivalent to Barrande’s Primordial zone,” and again, 
“His Primordial group is only Lower Silurian. 1 conceive that 
we have exactly his Primordial group in the band of slates con- 
taining Paradoxides.”’* 
The names of Cambrian and Silurian were thus prior to that 
of Taconic, and so far as regards the Upper Taconic, it is now 
shown by palzontological studies to be unquestionably the strati- 
graphical equivalent of the great mass of the Cambrian of Sedg- 
wick, including accidentally, as we have seen, small portions of 
his Upper Cambrian (Ordovician), but excluding, so far as yet 
known, the lowest Cambrian or Paradoxides horizon. It remains 
to be seen whether American or European geologists will aban- 
don the accepted and well-defined terms of Cambrian for that of 
Taconic. 
(To be concluded.) 
NOTES ON THE GLACIATION OF THE PACIFIC 
COA 
BY G. FREDERICK WRIGHT. 
J HAVE elsewhere (see Am. Four. Sci. for January) given an 
account of the results of my observations during last summer 
_ onthe Muir Glacier, Alaska. The journey to and from that point 
of interest afforded equally good opportunities for observation. 
The Northern Pacific Railroad passes out of the glaciated re- 
gion at Sims’ Station, Dakota, about forty miles west of Bismarck, 
at an elevation of two thousand two hundred and eighteen feet 
Tha Haki Ps +s. meee 
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