The geological boundary at approximately 66 million years ago, associated with a major mass extinction. Deep lineage splits, ecological radiation and first fossil occurrence are distinct events in assessing mammalian history.
The large impact associated with the Cretaceous–Palaeogene boundary and its mass extinction. Atmospheric dust, aerosols and soot can connect an impact to reduced sunlight, suppressed photosynthesis and disruption of food webs; these environmental mechanisms distinguish the trigger from its biological effects.

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