id	keyword
gc-228	carbonate
gc-228	sea
gc-228	clastic
gc-228	cycles
gc-228	level
gc-228	reef
gc-228	sequences
gc-228	fig
gc-228	red
gc-228	platform
gc-228	basin
gc-228	plate
gc-228	limestone
gc-228	deposition
gc-228	highstand
gc-228	carboniferous
gc-228	coast