Frasnian–Famennian boundary

Target entity: Frasnian–Famennian boundary
Context triple: [Kellwasser events, associatedWith, Frasnian–Famennian boundary]

• A. Givetian–Frasnian boundary
  The Givetian–Frasnian boundary marks the internationally recognized stratigraphic transition between the Middle and Late Devonian periods, defined by specific fossil and sedimentary changes in the geologic record.
• B. Emsian–Eifelian boundary
  The Emsian–Eifelian boundary marks the internationally recognized transition between the Early and Middle Devonian periods in the geologic timescale.
• C. Hangenberg black shales
  The Hangenberg black shales are organic-rich Late Devonian sedimentary deposits that record the environmental and oceanographic upheavals associated with the Hangenberg extinction event.
• D. Furongian
  Furongian is the late epoch of the Cambrian Period, marking the final stage of early Paleozoic marine life diversification before the Ordovician.
• E. Imbrian period
  The Imbrian period is a major lunar geologic era characterized by extensive mare volcanism and large impact basins that shaped much of the Moon’s visible surface.
• F. None of above. chosen
• G. Unsure - the case is ambiguous/there is not enough information to decide.

Target entity: Frasnian–Famennian boundary
Target entity description: The Frasnian–Famennian boundary marks a major Late Devonian mass extinction interval characterized by severe global environmental upheavals and widespread marine biodiversity loss.

• A. Givetian–Frasnian boundary
  The Givetian–Frasnian boundary marks the internationally recognized stratigraphic transition between the Middle and Late Devonian periods, defined by specific fossil and sedimentary changes in the geologic record.
• B. Emsian–Eifelian boundary
  The Emsian–Eifelian boundary marks the internationally recognized transition between the Early and Middle Devonian periods in the geologic timescale.
• C. Hangenberg black shales
  The Hangenberg black shales are organic-rich Late Devonian sedimentary deposits that record the environmental and oceanographic upheavals associated with the Hangenberg extinction event.
• D. Furongian
  Furongian is the late epoch of the Cambrian Period, marking the final stage of early Paleozoic marine life diversification before the Ordovician.
• E. Imbrian period
  The Imbrian period is a major lunar geologic era characterized by extensive mare volcanism and large impact basins that shaped much of the Moon’s visible surface.
• F. None of above. chosen