Thomas Crowley and Gerald North, oceanographers at Texas A&M University, describe the melting of the great ice-sheets at the end of the last Ice Age … - Graham Hancock

I am convinced that the way forward for the human race is to recognize and protect the fundamental right of sovereignty over consciousness, to throw off the chains of our divisive religious heritage, to seek out forms of spirituality (or no spirituality at all if we so prefer) that are truly supportive of liberty and tolerance, to help the human spirit to grow rather than to wither, and to nurture our innate capacity for love and mutual respect. The old ways are broken and bankrupt and new ways are struggling to be born. Each one of us with our own talents, and by our own choices, has a part to play in that process.

The possession of such a big brain was no doubt an asset to these ‘intelligent, spiritually sensitive, resourceful creatures’8 and the fossil record suggests that they were the dominant species on the planet from about 100,000 years ago until 40,000 years ago.

The Younger Dryas impacts, and subsequent sustained cataclysm, changed the face of the earth completely and wrought particularly significant havoc across North America. We have considered the question of huge volumes of meltwater released into the Arctic and Atlantic Oceans from the destabilized ice sheet and looked at the effects on global climate. But keep in mind that those enormous floods also devastated the rich North American mainland to the south, perhaps the best and most bounteous real estate then available anywhere.
This immense and extraordinary deluge, 'possibly the largest flood in the history of the world,' swept away and utterly demolished everything that lay in its path. Jostling with icebergs, choked by whole forests ripped up by their roots, turbulent with mud and boulders swirling in the depths of the current, what the deluge left behind can still be seen in something of its raw form in the Channeled Scablands of the state of Washington today — a devastated blank slate [...] littered with 10,000-ton 'glacial erratics,' immense fossilized waterfalls, and 'current ripples' hundreds of feet long and dozens of feet high.
If there were cities there, before the deluge, they would be gone.
If there was any evidence of anything that we would recognize as technology there, before the deluge, it would be gone.