Exploring abrupt climate change induced by comets and asteroids during human history

PBS NOVA on the Younger Dryas Impact

Wonderful 2009 show available again -- but watch quickly!

It seems like a lazy cheat to post YouTube videos two weeks in a row, instead of writing in-depth subject articles on the Tusk. But who has the time for that? And anyway the video below is a particularly special communication. It is special because WGBH\PBS no longer stream this 2009 episode on their services — nor have they since 2011 — reportedly at the behest of Younger Dryas Impact critics.  Meanwhile, in more recent times, this PBS science dude gives us our due. Go figure.

In any case, it is a beautiful program that deserves to be seen. Anyone with the slightest interest in our subject would enjoy it immensely. Keep in mind its availability has been of an “ephemeral” nature given certain vagaries surrounding “copyright,” and silly notions like that.

Bonus video: Great show and kind words for the Tusk from Randall Carlson and Ben at UnchartedX.

3 Responses

  1. In the video w Randall Carlson and Ben from UnchartedX, they spend a bit of time talking about Tony Zamora and his ideas on the Carolina Bays — thousands of elliptical ponds, many filled in with soil over time, all of them oriented in almost precise alignment, that cover the landscape of vast portions of the Carolinas. They seem to date from the end of the Younger Dryas, the brief but chaotic period marking the END of the last Ice Age about 12,500 years ago.

    For any unfamiliar, Antonio Zamora’s ice boulder genesis hypothesis for the forming of the Carolina Bays, and similar elliptical ponding features in Georgia and Nebraska is seductive… He suggests that at least one large cometary fragment either impacts directly, or transmits a high-energy shockwave to the surface of the Canadian Ice Sheet, blasting tens of thousands of boulder-scale shards and millions of much smaller ice debris around the North American continent.
    According to his premise as I understand it, these fragments followed expanding trajectories that brought a thick rain of shattered ice covering much of the un-glaciated lower portions of North America. So, the ice chunks would be “secondary fragments” with a tiny fraction of the original object’s kinetic energies or velocity, just enough to toss’em 1500 kilometers or so. The smaller bits, some more like snow or sleet, would be quickly slowed by air resistance, and drop to the ground to cover the landscape in freezing slush.
    When the larger chunks plunged into sandy soil, loess, bogs, and other soft soil, their relatively low velocity would have created elliptical impact craters, NOT the characteristic Circular craters that result from a massive explosion such as would result from an object arriving at cometary velocity, and by its far higher velocity converting its mass to expanding high temperature vapor instantly as it hits the surface.
    Where the large ice chunks came to earth on rock outcroppings, or solid ground, or in forests, they would not create the elliptical impact troughs, because of the much greater cohesion and resistance of other materials, or geologic features.
    • My question is whether the glacial sheet ice would have the structural integrity for any boulder-sized fragments to remain intact after the initial impact and the aerodynamic forces tearing at the surface irregularities through the fifteen-hundred-kilometer passage to impact.

  2. BTW, the article linked by Mr. Underwood is mind-stretching. Describes viruses that use some additional NEW nucleotide that can substitute for the Adenine in its DNA.
    That is, all previously known DNA consists of the pairing nucleotide bases adenine-guanine and cytosine-thymine, meaning Adenine always seeks out and connects to Guanine, while Cytosine and Thymine Always connect to each other. We never see pairings like C-to-A or T-to-A, et cetera. just A-G and C-T.

    Read the article.

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