The late Paleozoic mountains collapsed as rifting from the Jurassic period began to open up the Gulf of Mexico. Pangea started to break up in the Triassic, but seafloor spreading to form the Gulf of Mexico happened only from the mid- and late Jurassic. The shoreline shifted yet again https://small-custom-flags10630.bloginwi.com/47329989/a-review-of-small-custom-flags