how do Fossils form?

how do Fossils form?

The way a fossil form depends on a few things. The most important step is that the remains or traces of life must be buried, the quicker the better. The longer they remain exposed the more likely it is that they destroyed by scavengers or by the environment itself. 

Imagine a desert versus the bottom of a deep sea... wind blasted sand dunes and hungry scavengers versus still, murky waters where gloopy mud is laid down steadily... where do you think fossils are more likely to form?