Assertion: methane | /r/AtLocation | gas
Facets:
value: formerly
type: TEMPORAL
Source sentences:
text: For example, some of the methane formerly contained in gas hydrate is retained in the sediments and consumed in the near-seafloor sulfate reduction zone in marine settings.
text: The most critical need is a fingerprinting method that can distinguish methane formerly contained in gas hydrate from other methane sources.