Assertion: catastrophic flood | /r/CapableOf | replace the isthmus of doverwatershed
Facets:
value: by a much lower watershed
type: OTHER
Source sentences:
text: At some time, probably around 425,000 years ago and again around 225,000 years later the barrier failed or was overtopped, loosing a catastrophic flood that permanently diverted the Rhine into the English Channel and replacing the "Isthmus of Dover" watershed by a much lower watershed running from East Anglia east then southeast to the Hook of Holland and (as at modern sea level) separated Britain from the continent of Europe; a sonar study of the sea bed of the English Channel published in Nature, July 2007, revealed the discovery of unmistakable marks of a megaflood on the English Channel seabed: deeply eroded channels and braided features have left the remnants of streamlined islands among deeply gouged channels where the collapse occurred.