The impact probably broke up the crust of the Earth and started or accelerated the process of Continental Drift.
Most likely the Gulf of Mexico was not there at the time, but may have been a shallow swamp.
https://news.nationalgeographic.com/2017/05/new-seafloor-map-gulf-of-mexico/
Could have been a storm of these hitting the earth when you consider all the craters that are out there. However it’s theorized there sure was a shake up of immense force and destruction....as well as years after. I doubt many realize how tough but fragile this planet is....thank God he holds all things together!....for now.
I didn’t know “The floor of the Gulf of Mexico is one of the most geologically interesting stretches of the Earth’s surface.”......Interesting indeed.