Joined: Sep. 2005
Why do you think there would be "thousands" of finch fossils? The Galapagos Islands are, as you say, compact, furthermore they are volcanic; fossils of any type should be pretty rare.
Since you are obviously a creationist burdened with emotional baggage (from the sneering tenor of your post), consider the following:
Indeed, it was Darwin who first recognized their volcanic origin, and who understood the profound implications of this origin for the history of life. For if the islands were volcanic, they must have formed after the creation of the world, and the organisms living there must have migrated there from someplace else. But since those organisms are found nowhere else, Darwin finally had to conclude that they had evolved there from South American ancestors.