Coroner Sheriff Payne told the hearing that Miss Blackman's death could not have been predicted.
He said the National Trust, which owns a stretch of the beach where the tragedy happened, appeared to be doing all it could to warn visitors of the dangers presented by the 100ft cliffs.
"Sadly, Charlotte Blackman died as a result of an accident. It was a sudden act of nature that nobody could have predicted at that time."
More top news
A woman who helped two men, convicted for murdering a Birmingham teenager, has been jailed for three years.
Wet and rather windy for a time today. Brighter later.
Wind and rain spreading to all parts. Drier later.