The study examined rock layers in Central Guizhou to understand how they were formed over time. By analyzing 14 sequences from the Nanhuan to Silurian periods, researchers found that most sequences were made up of rising and stable water levels, typical of shallow areas. They also discovered that certain rock layers disappeared in central Guizhou, indicating a break in deposition. This research helped create a sea-level change curve for the Nanhuan to Silurian periods, which can be used to compare sea levels in southern China and globally.