An enlightening investigation of the Pleistocene's dual character as a geologic time--and as a cultural idea The Pleistocene is the epoch of geologic time closest to our own. It's a time of ice ages, global migrations, and mass extinctions--of woolly rhinos, mammoths, giant ground sloths, and not least early species of Homo . It's the world that created ours. But outside that environmental story there exists a parallel narrative that describes how...