Oh, I suspect some oil also made its way ashore around Ixtoc. The one thing I have not yet located is a science study of the immediate vicinity of the Ixtoc well itself.
But such documentation "does" exist for the Persian Gulf "Saddam Hussein" spill. The worst affects were seen in the salt marshes, which took up to ten years to recover....BUT...the magnitude of the oiling was hugely greater than Ixtoc was or BP is likely to be. Beaches were completely covered up to the high-tide water marks with al layer of oil, and oil seeped down into the soil to a depth of 60 cm.
In areas where the oil coverage was not total, recovery was a lot faster.
http://www.c-3.org.uk/Multimedia/Reports/Gulf%20war_Poonian.pdf
Oh yes, and all of the South Texas coast was impaced by it, North Padre Island especially. Booms, however, protected most of the estuaries. My point was about where the oil hits shore. The marshes of LA being much more vulnerable and valuable than the sandy beaches of South Texas.