[Rockhounds] Younger Dryas Impact Hypothesis and Missoula (Spokane) Megafloods

[J Bryan Kramer]

Really? Who is going to provide the ice age to power these floods?

BK

 “Unlike the cruel Leonidas, who demanded that you stand, I require
only that you kneel.”

--Xerxes

J Bryan Krämer       North Florida, USA
photos at: http://pbase.com/photoburner


On Sat, Oct 14, 2017 at 3:00 PM, Dora Smith <tiggernut24 at yahoo.com> wrote:
> I thought earthquakes caused by the subduction zone caused megafloods in
> that area and they happen every few hundred years, the next one being
> overdue.
>
> Dora
>
> -----Original Message----- From: Paul
> Sent: Saturday, October 14, 2017 10:32 AM
> To: Rockhound List
> Subject: [Rockhounds] Younger Dryas Impact Hypothesis and Missoula (Spokane)
> Megafloods
>
> There is a new paper containing research about the
> Missoula (Spokane) megafloods that contain bad news
> for those few proponents of the Younger Dryas impact
> hypothesis, who argue that these megafloods were
> a single megaflood and caused by a hypothetical Younger
> Dryas Impact.
>
> It is:
>
> Balbas, A.M., Barth, A.M., Clark, P.U., Clark, J., Caffee,
> M., O’Connor, J., Baker, V.R., Konrad, K. and Bjornstad,
> B., 2017. 10Be dating of late Pleistocene megafloods
> and Cordilleran Ice Sheet retreat in the northwestern
> United States. Geology, 45(7), pp.583-586
> http://iafi.org/wp-content/uploads/Balbas2017-Missoula-Flood-Chronology.pdf
> http://iafi.org/iafi/resources/
> http://iafi.org/iafi/beryllium-10-dating-of-late-pleistocene-megafloods-and-cordilleran-ice-sheet-retreat/
>
>
> This paper contains cosmogenic 10Be ages that directly
> date flood and glacial features important to understanding
> the flood history, the evolution of the Channeled Scabland,
> and relationships to the Cordilleran Ice Sheet. Popular
> authors of lay books for the general public, lecturers, and
> podcasters, e.g. Graham Hancock and Randall Carlson cannot
> dismiss these dates as they did any radiocarbon dates that
> contradicted their beliefs as being older wood / bone
> reworked from older sediments.
>
> The last of the larger megafloods occurred at 18.2 ± 1.5 ka. It
> flowed down the northwestern Columbia River valley prior to
> blockage of this route by advance of the Okanogan ice lobe
> of the Cordilleran Ice Sheet. The largest of multiple megafloods
> predates the alleged Younger Dryas impact event by thousands
> of years.
>
> These dates show that the last of the megafloods from
> glacial Lake Missoula occurred at about 14.7 ± 1.2 ka. The
> youngest of the dated megaflood(s) (14.0 ± 1.4 ka to
> 14.4 ± 1.3 ka) likely came from glacial Lake Columbia,
> indicating that the lake persisted for a few centuries after
> the last Missoula megaflood. The last of the megafloods
> predate the alleged Younger Dryas impact event by
> thousands of years and came from two different sources.
> The multiple megafloods that all are older than the
> start of the Younger Dryas and, as a result, cannot be
> associated with a hypothetical Younger Dryas event
> as a few self-taught avocational investigators argue.
>
> That there were multiple the Missoula (Spokane) megafloods
> that predated a hypothetical Younger Dryas Impact is a
> long standing idea based on solid evidence is shown by an
> older and related Friends of the Pleistocene field trip
> guidebook. It is:
>
> Waitt, R.B., 1983. Tens of successive, colossal Missoula
> floods at north and east margins of channeled scablands.
> Friends of the Pleistocene, Rocky Mountain Cell, Guidebook
> for 1983 Field Conference Day 2: 27 August 1983
> U.S. Geological Survey Open-File Report 83-671
> https://pubs.usgs.gov/of/1983/0671/report.pdf
> https://pubs.er.usgs.gov/publication/ofr83671
>
> More recent research will be presented at the October
> 22nd Geological Society of America (GSA) Annual Meeting
> in Seattle. Go see:
>
> Session No. 22. T174. Cordilleran Ice Sheet Outburst
> Floods: From Glacial Lake Missoula to the Hubbard Glacier.
> Sunday, 22 October 2017: 8:00 AM-12:00 PM.
> GSA Annual Meeting in Seattle, Washington, USA - 2017
> https://gsa.confex.com/gsa/2017AM/webprogram/Session43011.html
>
> Yours,
>
> Paul H.
>
>
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