World-building process

Jan 23, 2022
Assume there is a formation of weathered limestone / sandstone spires. Adjacent to that is a sedimentary basin, most likely the result of an ancient lake or ocean. Assume now that the ocean still exists but sits some distance away. What is the most likely composition of rock in the region between the basin and the new ocean shoreline? (I'm a writer of Sci-Fi but like to get the science right.) Thanks for any insights.