Correct.
It is the Price of oil in gold. So it shows that although in dollars oilprice keeps rising through the decades, if we measure it in something else, the relationship has been rather unchanged, well discounting the swings...
"In order to examine the question of the value of oil apart from the value of the dollar, we need to factor the dollar out of the equation. One way is to look at the price of oil denominated in gold. The above chart does just this. It shows the price of a barrel of oil, 1970 to date, not in dollars, but in ounces of gold. Over this entire time frame, the price of oil has barely budged. In dollars, it went from $3.35 to $53.40, up by a factor of 16. In gold, it went from 0.965 ounces to 0.840 ounces - a slight decline."
"What most people miss when they talk about oil prices is that there is not one, but two, commodities involved. When we quote an oil price in dollars, we are not talking merely about the value of the oil, but also the value of the dollars. "Dollars per barrel" is a ratio - a ratio of the value of the oil to the value of the dollar. Therefore, any analysis that purports to divine the course of that ratio must take into account not merely the supply and demand factors for the oil, but of the dollars as well."