The content of trace elements in quartz has great importance for quality estimation of quartz raw material used for monocrystals synthesis and glass melting.Entering forms of trace elements in major economic types of ...
The distribution of Lower Silurian conodonts from the sections on the Kozhym River was studied first by S.V. Melnikov.After additional studies of the Upper Ordovician-Lower Silurian strata,Oulodus? aff.nathani, Wallis...