Thus It Cannot Be Denied

It Is To Them [fossils] Alone That We Owe The Commencement Of Even A Theory Of The Earth ... By Them We Are Enabled To Ascertain, With The Utmost Certainty, That Our Earth Has Not Always Been Covered Over By The Same External Crust, Because We Are Thoroughly Assured That The Organized Bodies To Which These Fossil Remains Belong Must Have Lived Upon The Surface Before They Came To Be Buried, As They Now Are, At A Great Depth.

Thus It Cannot Be Denied That The Masses Which Today Form Our Highest Mountains Were Originally In A Liquid State; For A Long Time They Were Covered By Waters Which Did Not Sustain Any Life.

Why Has Not Anyone Seen That Fossils Alone Gave Birth To A Theory About The Formation Of The Earth, That Without Them, No One Would Have Ever Dreamed That There Were Successive Epochs In The Formation Of The Globe.

My Object Will Be, First, To Show By What Connections The History Of The Fossil Bones Of Land Animals Is Linked To The Theory Of The Earth And Why They Have A Particular Importance In This Respect.

Secondly, The Nature Of The Revolutions Which Have Altered The Surface Of The Earth Must Have Had A More Decisive Effect On The Terrestrial Quadrupeds Than On The Marine Animals.