[1] https://www.texasmonthly.com/the-culture/texas-primer-the-ba...
"How the Cretaceous coastline of North America affects US presidential elections
...
Along that ancient coastline of a shallow sea, plankton with carbonate skeletons lived and died in massive numbers, accumulating into large chalk formations on the bottom of the sea. When the sea level dropped and the sea drained through the porous chalk, rich bands of soil were left right along the former coastline. When that area was settled and farmed in the 19th century, that rich soil was perfect for growing cotton. And cotton production was particularly profitable, so slaves were heavily used in those areas."
So two notes. 1) It would be nice to track glaciers, they used to be truly massive during past history and it would be interesting to see them recede and more land being above water level
2) Going the other way would be interest too, what would the earth look like in 100,000 or million years?