Paleodepth refers to the depth of the ocean in the past geological eras. There are several synonyms used for this term that give different insights into the ancient oceanic conditions. These synonyms include bathymetry, paleobathymetry, paleodepth mapping, and depth reconstruction. Bathymetry is the study of ocean depths, while paleobathymetry reconstructs the ocean floor depths during ancient geological periods. Paleodepth mapping uses modern technology and information from fossils to create a digital model of the ancient ocean depths. Depth reconstruction, on the other hand, reconstructs the past ocean floor depths through geodetic and geologic techniques. These synonyms describe different aspects of the study of ancient ocean depths and are commonly used in geological research.