You have to remember that the fossil record doesn't preserve every step in the evolutionary chain. Most dead animals & plants just rot away; only a tiny fraction of 1% are preserved as fossil imprints. It is a spotty, haphazard means of preservation; it can easily give the appearance of "discrete" steps. Many of the intermediary steps are either lost to the winds of time or remain under the ground, waiting to be uncovered.
all you have done is provided an explanation of why the fossil record doesn't match with extant demonstrations. if it is haphazard, it still shouldn't be selective, it should still provide evidence of the long chain of minute changes. These minute changes are the only demonstrable "evolution".
the fossil record, records dead things, the so-called "evolutionary chain" is one explanation (granted the most conventionally excepted explination) of the fossil record.
the bible told of mass extinction long before man (tried to divide it up into 6-7 mass extinctions)found the fossil record.