The Late Ordovician mass extinction may have resulted from a GRB 443 mya.
Its effects are observed in the fossil record of marine life (effectively: the only life on Earth at the time), and were far more pronounced at shallow depths than deeper ones, corresponding to dose-effect theories.
Note that this is a hypothesis and would likely be impossible to verify.
Its effects are observed in the fossil record of marine life (effectively: the only life on Earth at the time), and were far more pronounced at shallow depths than deeper ones, corresponding to dose-effect theories.
Note that this is a hypothesis and would likely be impossible to verify.
<https://en.wikipedia.org/wiki/Late_Ordovician_mass_extinctio...>