You brought up Daytona. Florida's an interesting case where discussions of plate tectonics may be off the mark. Seems like it was formed mainly by deposition of

You brought up Daytona. Florida's an interesting case where discussions of plate tectonics may be off the mark. Seems like it was formed mainly by deposition of seashells, shellfish, corals and sand and clay over the past 30 million years.[0] Looks like water levels were higher over most of that time period (p.71), so sea life could exist there and steadily build up a mineral base over time. It's also been much lower recently. Over the past 18,000 years sea level has risen 120m[1]. p. 71 in that book shows more detail for sea level over the past 5 million years than the wikipedia link. Here are some color renderings of what florida probably looked like from LEO over the past 40 million years[2] It seems that in places where magma is not pushing up new continental landmass (e.g. Florida), new land is created by sedimentation only underwater, while water levels are high. Then it's exposed when water levels recede, but when water levels rise again, that land is eroded and reclaimed until it is completely underwater, at which point it may grow again if there is an abundance of shellfish and coral. Right now we seem to be at the "rising sealevel, quickly-eroding shoreline" part of the cycle, which is inconvenient for human development. 0: http://gen.lib.rus.ec/search.php?req=The+Geology+of+the+Everglades+and+Adjacent+Areas http://gen.lib.rus.ec/search.php?req=The+Geology+of+the+Ever... 1: https://en.wikipedia.org/wiki/Past_sea_level https://en.wikipedia.org/wiki/Past_sea_level 2: https://www.nps.gov/common/uploads/teachers/lessonplans/Material_1_Florida-paleo-geography-maps-4.pdf https://www.nps.gov/common/uploads/teachers/lessonplans/Mate...