Hi Floyd, Bernd, and list,
At 22:38 09-05-09, Floyd wrote:
I am seeking help. I am looking for any info and maps on the Canyon
Diablo strewn field.
The map that Bernd mentions was made by Samuel J. Holsinger and dated
November 1908. Holsinger was Daniel Barringer's drilling supervisor
at the crater for many years and namesake of the 639 kg Holsinger
fragment, the largest known individual meteorite found to date in the
vicinity of the crater. A jpg of the map can be viewed here:
http://www.nature.com/nature/journal/v434/n7030/extref/434157a-s3.jpg
The map marks the location of both meteoric iron siderites and iron
oxide shale balls. Nearly all locations marked on the map fall within
a circle with a radius of 5.5 miles centered on the crater. Curious
minds wonder whether fragments are now being found even further away,
thanks to the miracle of modern metal detectors.
One interesting aspect of Holsinger's map is that the distribution
within one mile of the crater was strongly assymmetric, with the
preponderance of the fragments found to the northeast of the crater.
I also need to know the direction flight.
It has long been believed that the meteoroid came in from the north
or northeast, based mainly on the asymmetric uplift of the rim, which
is higher on the south side. The asymmetric distribution of fragments
outside the crater and near to it may support this trajectory hypothesis.
This short article mentions a north or northeasterly trajectory and
an angle of 80 degrees, though it does not mention sources for this
information:
http://content.zdnet.com/2346-9595_22-95512.html
Does anyone out there know of a journal article where the 80 degree
angle is discussed, with the rationale behind proposing this value
for the trajectory angle?
Best wishes to all,
Piper
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