Rencontre Formation


The Rencontre Formation is a geological formation just below the Cambrian-Ediacaran boundary in Newfoundland, deposited in a fault-bounded enclosed basin. U-Pb dates obtained just below its base give a maximum age of.
It is subdivided into five depositional phases, with two subsequent phases in a seven-phase series corresponding to the overlying Chapel Island Formation and Random Formation.
  1. Phase one - 300 m - conglomerate dominated, some sandstone and minor siltstones
  2. Phase 2 - 150 m - sands and silts
  3. Phase 3 - 180 m - silts and minor sands; lower silts are grey-green, glauconitic, wave-rippled and mud-cracked; upper silts becoming red
  4. Phase 4 - 200 m - coarse sands
  5. Phase 5 - greater than 200 m - arenites and red silts.