👉 Antediluvian, also known as Antediluvium, is a term used in archaeology and geology to describe the period of time when most of Earth's landmass was covered by water. This term refers to the era before the formation of oceans, which occurred around 60 million years ago. During this time, much of the earth's surface was covered by water (known as "antediluvial lake sediments"), and many of the continents were still connected