It is 60 million years ago. The world is still recovering from the asteroid's impact. Apparently a few pockets of ferns survived. They spread across the landscape. Narrow-leafed trees came next. These trees were northern varieties which lost their leaves each year. Even though they spread south, they continued to lose their leaves.
Turtles were very successful in this new landscape. Crocodiles and alligators must have survived the blast in some hidden pockets. Their fossils begin to show up in the early layers after the Chicxulub explosion.
In the center, the island of Cuba is forming. As the arc of land connecting North America with South America moves east, it will break up to form Jamaica, Haiti, Puerto Rico, and the Lesser Antilles. The arc of land to the left will become modern Central America.