Today the lake and swamp deposits which accumulated during this period form a 2 600 m thick sequence of sedimentary rocks and coals known as the Stellarton Formation.
(the lake; accumulated; T:during this period form) (sedimentary rocks and coals; known; as the Stellarton Formation)
the lake sedimentary rocks and coals
accumulated known
T:during this period form
as the Stellarton Formation