Sedimentary rocks are formed by small rock pieces which ... 2 Deposition In deposition, sediment which was carried in transport is laid down. 3 Sedimentation Layers of sediment form on top of ...

where the oldest sedimentary rocks on Earth can be found. A layer of volcanic rock cuts through them, and the scientists used the uranium-lead clock inside its zircons to date it to 3.85 billion ...

"Our study focuses on chemical sedimentary rocks found in the Saglek-Hebron. These rocks, among the oldest on Earth, dating back 3.9 billion years, are created through oceanic precipitation.