I can't give an example, that's the catch. It's a generic term representing the extent of change needed to evolve one species into a completely new species or a different type.
macroevolution n : evolution on a large scale extending over geologic era and resulting in the formation of new taxonomic groups
microevolution n : comparatively minor evolutionary change involving the accumulation of variations in populations usually below the species level
I can give you a bunch of theories as examples, but they aren't factual examples, as the change could not be observed.
But, here's one theory:
Archaeopteryx was small, with a wingspan of 0.5 m and weighed about 325 g. Its feathers were similar to those of flying birds, but its skeleton closely resembled that of a small carnivorous dinosaur. The brain was relatively large for an animal of that epoch.
And so we have a change from dinosaur/lizard to somewhat of a transitional bird. Though a lot of the links between the archaeoteryx and it's original ancestor (which is not known) are missing, from lizard to bird is a pretty big (macro)change.
Even the rapid changed of punctuated equilibrium take tens of thousands or millions of generations. Rapid is a misleading word.
Evolution is like compound interest. The rates are different at different times and places, but the changes accumulate one step at a time. There are no macro changes in one, or even a few generations.