GEOLOGICAL MAP. 
G83* 
pied by the same geological formations, possessing an equally or surpassingly fertile soil, is straining every nerve to throw 
her productions into that ocean thoroughfare, the chain of great lakes ; and if New-York now feels the influence of that 
youthful country, what will it be when the populations and productions have increased to ten, and even twenty times 
their present amount 1 
To the geologist here is a vast field laid open for investigation. The unbroken extent of strata offers the means of 
tracing over wide areas the lithological changes dependant on deeper waters or greater distance from land. The fauna of 
this ancient ocean presents great and interesting changes, as we progress over these wide districts—its ancient bed. 
Changes, both in organic remains and the condition of sedimentary deposits, are constantly presenting themselves ; and 
when these shall be more fully investigated, we shall feel at liberty to draw more general conclusions, and to propound 
more comprehensive theories respecting the primeval condition of our planet. 
