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      - Mesoproterozoic
        
        Aldridge Formation (1)
      - Neoproterozoic
        
        Ediacaran (3)
        
        Vendian (1)
      - Paleoproterozoic (1)
- problematic fossils
  - problematic microfossils (1)
- reefs (1)
- remote sensing (1)
- sea water (6)
- sea-floor spreading (1)
- sea-level changes (4)
- sedimentary petrology (6)
- sedimentary rocks
  - carbonate rocks
    - chalk (2)
    - grainstone (2)
    - limestone (2)
    - packstone (2)
    - travertine (1)
    - wackestone (2)
  - chemically precipitated rocks
    - chert (9)
    - flint (1)
    - iron formations
      - banded iron formations (5)
    - ironstone (1)
    - siliceous sinter (2)
  - clastic rocks
    - black shale (2)
    - claystone (1)
    - mudstone (6)
    - porcellanite (1)
    - sandstone (2)