This is an example of an older rock unit being thrust up and forming mountains, which were in turn eroding and depositing into the foreland basin.
(This; is; an example of an older rock unit) (an older rock unit; being thrust up; ) (an older rock unit; forming; mountains, which were in turn) (mountains; were; in turn)
This an older rock unit an older rock unit mountains
is being thrust up forming were
an example of an older rock unit
mountains, which were in turn
in turn