Met-list,
On the Geologic Map of the silver city 7.5' Quadrangle west-central
Montana are described Target Rocks in the Spokane Formation. On the
red bedding planes of the Spokane formation are areas of Concentric
bleaching around a central grain. Central core red, then black, and
finally
Jack wrote in Precambrian target rock mystery at
http://www.mail-archive.com/meteorite-list@meteoritecentral.com/msg115243.html
I am thinking an ET origin regarding these targets and
throwing out idea for comments.
and
Phillis Hargrave et al lead author of the above paper with
the Montana
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