there might be, or not. on this scale, +- 1 million years is nothing. but if meteorite shower was intense, it could have affected atmosphere, which in cascading

there might be, or not. on this scale, +- 1 million years is nothing. but if meteorite shower was intense, it could have affected atmosphere, which in cascading effect could have altered conditions in oceans to be more favorable for marine life. or about billion or so other possibilities.