valuable content
4.In order to insure the content was detailed and true, this book adopted some ways of copying, clipping etc, and widely quoted many historical data, such as corpus, memoir ,biography, unofficial history, note and chorography and so on. so the book has extensive, valuable, objective historical data.
5.Comparing the parameters such as distribution of carbon amount,carbon amount with peak value of content,carbon predominance index(CPI),and pristane/phytane ratio(Pr/Ph) in the immature organic matters in the sediments from the bottom of Qinghai Lake with those in mature hydrocarbon source rocks and crude oils from the typical salty lacustrine environment in our country can give us a set of valuable reference data about the maturity of organic matters.

