Does the geology related to the current shale revolution from pretty much the same area have anything to do with that past sea? I’m just curious and too lazy to search for it now on my mobile phone
Virtually all petroleum (and shale-oil) deposits were formed in shallow seas, though possibly in lakes or wetlands (though swamps are more associated with coal-bed formation). Oil is largely metamorphosed algae.
J.R. Dyni, "Geology and Resources Of Some World Oil-Shale Deposits" (2003)
Oil shales were deposited in a variety of depositional environments including fresh-water to highly saline lakes, epicontinental marine basins and subtidal shelves, and in limnic and coastal swamps, commonly in association with
deposits of coal.
