[meteorite-list] Question About Documented "Radial Fractures" and Ni Anomalies at Impact Craters

[Paul H.]

Dear Friends,

I have seen the presence of "radial fractures" and "Ni 
anomalies" in local sediments used as evidence for the 
extraterrestrial impact origin of landforms and features.
>From what I have found so far, neither of these criteria
are recognized as being either traditional, valid, or 
convincing evidence for arguing that a feature or 
structure is of impact origin.

Does anyone know of any of the impact structures 
recognized by the Geological Survey of Canada's Earth 
Impact Database that have been documented to have 
"radial fracture" systems or "Ni anomalies" in local 
stream or other surficial sediments associated with 
them?  Has anyone argued for either "radial fractures
of Ni anomalies in surficial sediments being valid 
criteria that demonstrates the extraterrestrial origin 
of specific landforms?

If so, any citation(s) to such research that can be sent 
to me offlist will be greatly appreciated.

Yours,

PAul H.