  A few of the major mass extinctions of paleontology have recently been found
to consist of two distinct extinction peaks at higher resolution. A viable
explanation for this remains elusive. In this paper it is shown that the
recently proposed volcanogenic dark matter model can explain this puzzling
characteristic of these extinctions. The accumulation and annihilation of dark
matter in the center of the Earth due to the passage of a clump leads to excess
heat generation with the consequent ejection of superplumes, followed by
massive volcanism and attendant mass extinctions. This is preceded by an
extinction pulse due to carcinogenesis arising from the direct interaction of
the clumped dark matter with living organisms.
