That piece of granite that a human cut square is not going to still be square in 1 million years, nonetheless 100 million.
Both fossils and granite erode. But an eroded fossil is still identifiable as a fossil. Stick it under a microscope and you'll see the microstructure produced by living cells, even if macroscopically it just looks like a hunk of rock. An eroded piece of granite is just another piece of granite.
Maybe under the right conditions an eroded piece of granite that started off square will still look kinda squarish, but no sane person finding a kinda squarish piece of granite is going to conclude it must have been a building block of an ancient civilization of hyperintelligent squids.
That piece of granite that a human cut square is not going to still be square in 1 million years, nonetheless 100 million.
Both fossils and granite erode. But an eroded fossil is still identifiable as a fossil. Stick it under a microscope and you'll see the microstructure produced by living cells, even if macroscopically it just looks like a hunk of rock. An eroded piece of granite is just another piece of granite.
Maybe under the right conditions an eroded piece of granite that started off square will still look kinda squarish, but no sane person finding a kinda squarish piece of granite is going to conclude it must have been a building block of an ancient civilization of hyperintelligent squids.