You're right. I thought you were referring to a civilization like our contemporary one, with the technologies and productive potential available to it. The scen

You're right. I thought you were referring to a civilization like our contemporary one, with the technologies and productive potential available to it. The scenario you describe, of a Bronze Age civilization being wiped out in one of the mass extinction events that life on Earth faced, is plausible. I'd add however that it didn't take long at all on a geological timescale for our civilization to go from its inception, with the invention of agriculture, to having advanced industrial technologies, and I assume the same would apply to other civilizations. So the probability of a civilization having emerged but having faced a cataclysm in the short span of time it would have taken for it to achieve the level of sophistication of our civilization is quite slim.