edge of the successive conditions or 8 
Geology and Mineralogy. 337 
times put in hat is hardly recognizable. Professor 
Cros the page ore the last, says that Professor Dana, 
believing that the Atlantic existed with nearly its present out- 
lines during Paleozoic time, and that the foldings of the Appa- 
lachian rocks were made by subsidence over the Atlantic area, 
thus “admits that the Appalachian sediments were separated from 
the Atlantic by at least one hundred and possibly several hundred 
miles of dry land ;” “in other words, Professor Dana tells us that 
the sediments deposited in one ocean were plicated by the subsi- 
dence of the floor of another and entirely distinct ocean.” 
In reply to this remark I observe that the Appalachian area of 
one ocean ;” it was generally (according to evidence from the 
‘trata) a shallow part of the continental border, receiving its 
h 
border, the geanticlinal as well as the geosynclinal, the two 
being concomitants in a system of flexure or 
Saying that the sediments now accumulating in the Gulf of 
Mexico will some day be compressed and folded by the subsi- 
theory is yet in sight, or a disposal of the subject by passing it 
Ver to the “« eologist,” instead of recognizing that — 
gical, 
48 established u d evidence nearly as the fact ren 
mal is a result of slow development from a germ; and this 
evidence is similar in general nature, it co 
