A couple observations from seeing it all presented this way:
- There's only three resources that will vanish after Antiquity! Felt like it was more, those are probably worth being wary of when planning science adjacencies.
- Twelve resources vanish after Exploration by comparison. I'd previously assumed vanishing resources automatically get substituted by something that could go on that tile, not so sure if that is actually a mechanism now thinking about it.
- 16 resources will persist the whole game, which is a little over a third if you don't count suzerain resources.
- Only five stay the same resource type in each era.
- Horses are arguably the only resource to change type every era, but that depends if you count treasure resources as empire resources or not.
- Gold and silver have opposite biome spawns.
- A number of effects swap between resources throughout the eras. Production towards land units comes from Salt in antiquity, Truffles in exploration and Cotton in modern.
- Exploration Spices are the only resource that can provide Influence.
- Rubies are the only resource that start out as not a treasure/empire resource then become one
- The resource unlock for the Mughals, a Modern civ, is only possible to achieve in Antiquity (Salt)
- Generally resources change a lot more between eras than I expected!