[meteorite-list] excellent Google Earth and ground views of shallow oval craters worldwide, Pierson Barretto: Rich Murray 2010.08.22

From: Rich Murray <rmforall_at_meteoritecentral.com>
Date: Sun, 22 Aug 2010 22:12:41 -0600
Message-ID: <A388E2707C7B4D57A689A842062FE9C6_at_ownerPC>

excellent Google Earth and ground views of shallow oval craters worldwide,
Pierson Barretto: Rich Murray 2010.08.22
http://rmforall.blogspot.com/2010_08_01_archive.htm
Sunday, August 22, 2010
[ at end of each long page, click on Older Posts ]
http://groups.yahoo.com/group/astrodeep/message/60
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_______________________________________________


COSMOPIER has left a new comment on your post "Dennis Cox sees both holocene
impacts and ancient ...":

Hello to All

Yes, the region in Africa is fantastic -- excellent scenery for a science
fiction movie.
Volcanic areas, estuaries, karst, doline, morin, marshes ... these areas are
ungrateful to crater hunters.
Anyway, meteors of any size can hit any place on Earth from the distant past
or recent past.
Apparently the end of the Pleistocene appears to be related to increased
heat in the atmosphere, destabilizing global climate, caused by meteoritic
impacts, and starting a new order of climate, the Holocene.
Geologically recent -- I've been focusing my research on this period.
The shallow, elliptical and aligned scars are possibly associated with the
cyclical impact of meteoroids originating from a prehistoric fragmented
comet. These elliptical craters can be found anywhere.
Field studies and geological surveys are key in finding the first clues!

See a possible example below:

http://maps.google.com.br/maps?f=q&source=s_q&hl=pt-BR&geocode=&q=-7.957474,+-14.377563&sll=-8.167993,-13.930664&sspn=7.259659,9.832764&ie=UTF8&ll=-7.957492,-14.377584&spn=0.028391,0.038409&t=h&z=15

[ Devil's Riding School, Ascension Island
-7.957474 -14.377563 crater .4 km long SW-NE axis,
white ejecta to NE,
found by Pierson Barretto
Posted by COSMOPIER to RoomForAll blog at Sunday, August 22, 2010 2:25:00 PM
MDT

Ascension Island 13.8 km long EW
Google Earth has added ground photo, Devil's Riding School

nearby , -7.957580 -14.367889 crater .25 km wide .305 km elevation ]

Best regards to All,

http://sites.google.com/site/cosmopier/impact-craters

pierson
<cosmopier at gmail.com>;

Posted by COSMOPIER to RoomForAll at Sunday, August 22, 2010 2:25:00 PM MDT

[ quick notes by Rich Murray ]

His impact-craters site has remarkable Google Earth and on the ground views
of many shallow oval craters:

http://maps.google.com.br/maps?hl=pt-BR&ie=UTF8&ll=-9.079934,-42.626299&spn=0.006759,0.009602&t=h&z=17

"The Capivara 0001 palaeolagoon where (2009) some siliceous clasts rocks,
possible impactites, were found.

Silliceous clasts rocks found on palaeolagoon Capivara 0001and Capivara
0004, possible impactites, in Sao Raimundo Nonato, Piaui (2009), Brazil.

The Quari palaelagoon, in Sao Raimundo Nonato south town, where (2004) a
layer of silliceous clasts rocks were found on the bottom layer of the lake,
at about 12,900 BP old sediment over a crystalline base rock, points to its
End-Pleistocene genesis."

I've found many similar porous, white, foamy rocks at shallow craters in New
Mexico.


http://ags.ou.edu/~bweaver/Ascension/ai-geol.htm

[ Barry Weaver gives many photos with detailed comments ]

"Pyroclastic deposits

Mafic and silicic pyroclastic deposits are distributed across much of
Ascension Island.
Most of Green Mountain is composed of pyroclastic deposits, both scoria and
pumice, and many of the lava flows in the western part of the island have a
thin pyroclastic veneer.
There have clearly been some very violent explosive silicic eruptions on
Ascension.

Many of the pyroclastic deposits show evidence of having been reworked by
water, suggesting that Ascension's climate was substantially wetter in the
past.
For example, Darwin recognized that the pyroclastic deposits which fill the
central depression in Devil's Riding School were deposited in a lake."

http://ags.ou.edu/~bweaver/Ascension/sa_geochem.htm

Comparitive composition of volcanic rocks from Ascension, St. Helena, and
Tristan

[ Precision elemental and isotopic studies were used. ]

"So not only are the sources for Ascension, St. Helena, and Tristan magmas
separate and distinct from each other, they also are separate and distinct
from the upper mantle that is the source for mid-ocean ridge basalt magmas."


Dennis Cox sees both holocene impacts and ancient volcanism in Clayton
Craters in SW Egypt -- cites huge Bronze Age solar flare event (Anthony L
Peratt, LANL) -- my Google Earth craters: Rich Murray 2010.08.14
http://rmforall.blogspot.com/2010_08_01_archive.htm
Saturday, August 14, 2010
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Rich Murray, MA
Boston University Graduate School 1967 psychology,
BS MIT 1964, history and physics,
1943 Otowi Road, Santa Fe, New Mexico 87505
505-501-2298 rmforall at comcast.net

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Received on Mon 23 Aug 2010 12:12:41 AM PDT