Ok, first off the time clock is a novelty to me, I place no real importance in it know it doesn't take 200 years to make a warrior. I use it to make jokes about having space travel in 1856 and airplanes since 1735.
Second responding to Rikhis, if spearmen bought AK-47s from arms dealers then they are no longer spearmen, they've upgraded to something else. On another civ board somebody claimed that Riflemen units were acutally just primarily compsed of Riflemen but also included artillery, medics, etc. I'd say that a unit is what it says it is, spearmen use spears not black-market rifles. Also I understand that low-tech units can beat high-tech, Custer's Last Stand for example, but Spearmen shouldn't beat a Tank and a Galley shouldn't beat a Battleship! I'm willing to assume Riflemen could destroy it with grenades or something but thick steel armor should lose to stone/bronze spearheads. As far as balance goes I think the rescources work fine, I've been driven p the wall unable to use advanced units for lack of Iron/Oil etc.