Sedimentary Rock Environments - Tide Flats

  1. Environment
    1. Tide flats are areas of transition between land and marine waters. They are typically flat expanses of fine sediments with abundant plant external arrow and animal life present.
    2. Washington state is rich with tide flats including our own Oak Harbor external arrow.
  2. Agents of erosion include the tides external arrow and waves.
  3. Tide flat external arrow sediments are fine. The sediments brought in are fine sands, slits and clays external arrow. There may be carbonates generated by shellfish.Tide flats are a mid-energy environment. While waves at the surface can be energetic, at depth water motion is more subdued.
  4. Resulting Rock
    1. Tide flat sediments become sandstone, limestone, shale.
    2. The Chuckanut formation external arrow has sandstone and shale deposits that originated from shallow marine environments possibly including tide flats
    3. Sandstone has traditionally been used in buildings external arrow. Shale deposits are being reexamined for use as oil and gas sources using the hydraulic fracturing external arrow technique. Limestone, while also used as dimension stone for buildings is extensively used in cement production.