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lithicbeads
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« on: June 26, 2013, 03:47:43 pm » |
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there were huge fresh and salt water oceans in the interior east of the rockies. The big freshwater oceans get diatom layers that are hundreds of feet thick at times , you can see them here in Washington in the central basin opal deposits so it could be silica from that source or salt water diatoms . They also could be arenaceous limestones as there were tall mountains with silica to your west but the diatom s are most likely. What is very confusing is the situation in Nevada as the mining company geologists use the term jasperoid for many deposits there that they grind up for the gold content yet they are supposed to be rare .
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