Prospecting in the Nepal Himalaya has brought to light Fe-formations that are probably Paleozoic, and a search of the literature has revealed others. The generalization that all Fe-formations are Proterozoic or Archeozoic, which is a basic assumption in many theories, is very probably not valid, therefore. A class of Fe ores intermediate in lithology and age between the banded Fe-formations and the Clinton ores is described. A factor that may explain the distinctive features of banded Fe-formations while accounting for the absence of these features in the Clinton ores is discussed. The suggestion is made that sedimentary Fe ores show a progressive change in lithology with tectonic evolution.

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