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Isopach map showing true stratigraphic thickness of Holocene sediments deposited offshore of Pacifica, California. An isopach map (/ ˈ aɪ s oʊ p æ k /) illustrates thickness variations within a tabular unit, layer or stratum.
Proven oil reserves in Iran, according to its government, rank fourth largest in the world at approximately as of 2013, although it ranks third if Canadian reserves of unconventional oil are excluded. [1]