The USA are still the world leader in production of hydrocarbons
In 2014, the United States were the largest crude oil and natural gas producer worldwide.
... in Ordovician and Silurian dark claystones and mudstones. Biostratigraphic classification based on these fossils is the key and the best tool of stratigraphic correlation. Graptolites make it possible to determine the relative age of the ...
Artykuł - 10/29/2014 - 13:22