I seem to recall being told or reading that there are a limited number of plots and that there are no new ones regardless of genre. The only difference is how the artist/author tells or retells the tale including setting, characters, events, subplots, etc. I think some plots may lend themselves better to certain genres like what we call westerns. But, basic plots are timeless. They work as well in tales set in today as well as 1600 or 1300.

And, I think that genres can be blended. In reading "Conaghan" recently, it occurred to me that it almost reads like a romance novel. But, because it was written by Louis L'Amour, it is categorized as a western. And, probably should be. I'm just sayin'...