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

Teaching the Younger Dryas Impact

The Tusk has characteristically hit a summer communication drought. But that doesn’t mean we can’t toss up a YouTube here and there from the coast. It’s welcome to see college courses fully integrating the Younger Dryas Impact into their thinking about the Younger Dryas and climate change. Here’s a great effort from Middlebury College.

Gotta love this guy’s building enthusiasm at 4:29. And 45,000 views!

6 Responses

  1. They mentioned the fullerenes with He inside, but they never tried to debunk or dismiss that. So, there was an impact.

    They tried at the end to dismiss the Hiawatha crater as too small to be from a 4 km comet, as if the fact that it is ana impact crater can be dismissed by that one not being a crater from an arbirtrarily conjured size of a 4 km. Even more, they did not took into account that this is a crater below ~2 km of ice, so it had to be considerably smaller because of that. Considering further the wide range of densities of comets, from 0.4 – 1.0 g/cm³, the object which impacted might have even been a 5+ km in diameter comet.

    They are fully correct about this being a highly improbable event to happen (again). Yet, the probability of all past events is always 100%. Events are only improbable before they happen, not after.

  2. The main impactor struck Saginaw Bay as demonstrated amply by Antonio Zamora’s excellent work on the formation of the Carolina Bays and Nebraska ‘rain water basins’ as secondary impacts caused by ice shrapnel which can be traced back using ballistic trajectories to Saginaw Bay. Greenland (+ others) may have therefore been part of a fragmented impact coincident in time with the main impact, increasing the size and range of the YDB debris field globally.

  3. Zamora is indeed correct about the Carolina Bays being the secondary impact craters. Yet, Davias is wrong about the Saginaw Bay being the main impact site. For one thing, size matters. The Saginaw Bay is 300 km from edge to edge. Chicxulub of the dinosaurs is only 180 km.

  4. Both the gamma radiation and the water outflows are the only firm data we have, as we are dealing with two separate impacts on an ice sheet. The LLodminster Uplift is generaly ignored, as people are not used to dealing with impacts on ice sheets.

  5. And now for the latest from NASA via SWRI:


    Factually, it is comets that cause Extinction Level Impact Events, and they come every 26 million years or so with a stochastic periodicity. We’ve known this since Clube and Napier The SWRI numbers are off by a factor of 10.

    Aside from that, the smaller object impact hazard is also minimized.

    The important part of all of this is the promotion of the South West Research Institute, while the NEOcam fro JPL languishes.

    73P is fragmenting in the inner solar system.

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