Evolutionary explications of morality

Two systems: the ancient, pre-language one and the later, ideated, articulable one:

[Dr. Jonathan Haidt] likens the mind’s subterranean moral machinery to an elephant, and conscious moral reasoning to a small rider on the elephant’s back. Psychologists and philosophers have long taken a far too narrow view of morality, he believes, because they have focused on the rider and largely ignored the elephant.

He does survey the moralities of the world to find different components to moral preferences.
Some musings at Evolving Thoughts.