Hi SnowEagle - I've extracted some of your observations/questions so that I can address these points and share thoughts too..Posted by Snoweagle (here)
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If this as I suggest, there will be others at comparatively similar distances below ground level.
The fault line isn't helping either, nevertheless, there may be more such geodes or evidence of the plasma flume extinguishing through less isotopic inorganic forms. A trail or trend?
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I feel sure there is a planned re-visit and explore, perhaps?
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What kind of electrical, spectral and or magnetic analysis have you available to you other than your own equipment?
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Planned revisit, definitely, and the search equipment will will be set to do a relatively "close" grid over the object at a higher resolution
Other Detectors
Besides the deep penetrating analyzer/3D mapper...
As to electrical, I do use ground sensing probes to monitor for any emission of electrical to the surface. For spectral I do hyperspectral imaging from a couple satellites. For magnetics, I use a 3 axis magnetometer. I have plans to incorporate a 3 axis gravity gradiometer, and I use wideband ULF (ultra-low frequency electromagnetic from 0.1 hertz through 150 hertz) and ELF electromagnetic detectors from 100 hertz to 1000 hertz. On occasion I will use a higher LF detection system setup as a gradiometer which can look up to 60 kilohertz.
I use a gamma ray scintillator/spectral anayzer as needed.
As to geodes - I didn't notice any, nor any "lava bombs", nor did I see any volcano cones or remains of such in the surrounding are (not that they may be highly eroded and hidden and thereby missed).
The 3.5 M year epoch was a key period of history. I think maybe getting into the significance of this time window may be useful and could help one understand that there 'may be more' of these 'objects' scattered across the world which didn't accidentally get buried... analyzing the coincidences may be useful.