Which one of these did the gulf coast oil deposits formed?AndFormation of most of the world's major iron-ore deposits?
If you mean offshore Gulf of Mexico then it is Cenozoic. If you mean places on land in the Gulf Coast like the Tuscaloosa Trend, the Wilcox Trend, or the Austin Chalk Trend then it is a tossup between Mezozoic and Cenozoic. Nearly all the earth's banded iron formations are pre-Cambrian.
The major ore deposits occurred in the Precambrian, sort. of. The iron was oxidized to its present form then. The gulf coast oil deposits are from the Paleozoic.
