THE ARCHEAN. 153 
B. Do YOU FAVOR THE DIVISION OF THE ArCHEAN GrODP 
INTO A DEFINITE NUMBER OF SYSTEMS? Tf SO, GIVE 
their names and the order of their succession. 
Profs. Dana, Jos. L. Le Conte, N. H. Winchell, M. E. 
Wadsworth, Major Powell, Mr. Hague, Prof. G. H. 
"Williams, Capt. C. E. Dutton, and Prof. Heilprin are not 
in favor of subdividing the Arcliean witli our present knowledge. 
Prof. Hitchcock would divide Archean into Laurentian 
(Lower, Middle, and Upper), and Huronian, and adds that ulti- 
mately we may restrict the Archean to the Laurentian, making 
sedimentation commence with the Huronian. 
Prof. Roland D. Irving would group the Pre-Cambrian 
rocks into Archean (as yet indivisible), and would call the 
Keweenaw, Huronian, Grand Canon, etc., by Prof. Charaberlin's 
name of " Agnotozoic." 
Major Powell would include "Huronian, Keweenaw, Uinta, 
and Grand Cailon " in this nev/ division. 
Mr. Walcott would include "Huronian, Keweenaw, Grand 
Canon, Llano" in a division, for the name of which he expresses 
no preference. 
Dr. Emmons suggests that the beds referred to by Irving (those 
between the Cambrian and Archean), be grouped together as 
" Proterozoic."* 
Prof. Pumpelly would confine the terra Archean to the 
rocks below the top of the Laurentian, and would leave the in- 
terval between the top of the Laurentian and the bottom of the 
Cambrian open for the freest exercise of local classification. For 
this interval he thinks the term "Agnotozoic" seems unobjec- 
tionable. 
Prof. Hitchcock suggests Eobiotic in place of Eozoic, as it is 
better to use the Greek word signifying animal life; and also 
because of a previous use of Eozoic. He thinks it would be 
better still to say EomorpMc in allusion to the fact that the Hn- 
* [This name seems preferable to Agnotozoic, both because to select our igno- 
rance of a terrane as a means of identifying it is to select that which all the 
terrancs have most certainly in common ; and also because the term Protero- 
zoic is elastic and better adapted to serve as a temporary scafTolding until more 
of the true history of the earlier rocks becomes known. But Eozoic or P>obiotic 
seems better than either, — Rep.] 
