<tentatively raises hand>

Rather than compartmentalize development of Settlements/Temples/Agriculture, or make them simultaneous... could it be they progressed in a natural order;

1) Settlements (game & resources plentiful here, nomadic pressures ease).
..
2) Temples (Start of social classes with higher classes the intermediaries to the gods.)

3) Agriculture (We've been here a while, thinned the herds and schools of fish a bit... it's either find an alternative food source or hit the road again...)

I'm sure it wasn't so clearly linear, but one step logically leading to the next makes some sense, y/n?

Jammer