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They also claimed that small pieces of debris found near Stonehenge, which were traced back to the dig site in Wales, were actually transported by the movement of glaciers over half a million years ago, and not brought by ancient masons along with the bluestones.
  Sedimentary rocks are formed by the lithification of the sediments  which accumulate from the erosion of â¦ preexisting rocks of all  types. They also included rocks form from animal and plant remains.   Metamorphic rocks are formed when sedimentary or igneous rocks are  heated and or squashed.1  How Limestone Changes to Marble Marble is a type of metamorphic rock highly prized by builders for its outward beauty. 2  Relatively rare, it forms from limestone, a common type of sedimentary rock. 3  How limestâ¦. Metamorphic rocks are formed when sedimentary or igneous rocks are  heated and or squashed. 1  How Limestone Changes to Marble Marble is a type of metamorphic rock highly prized by builders for its outward beauty.