Abstract
Carboniferous pelitic sediments of the Ruhr district are characterized by contents in boron varying with the degree of salinity of the water in which the sediments were deposited. Freshwater sediments have contents in B 2O 3 varying between 0·005 and 0·015 per cent; typical marine sediments have contents from 0·03 to 0·06 per cent. These contents seem to be stable during diagenesis and weathering; with incipient metamorphosis they seem to become diminished. Determinations of boron contents seem to offer possibilities for correlation in non-fossiliferous sequences of changes in salinity, as well as a means for diagnosis of the environment of non-fossiliferous sediments.
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