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."
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Cold with some wintry showers in the west.
Cold tonight with some wintry showers in places.
Arthur Gumbley was beaten up and robbed in his home in Sutton Coldfield on the 21st of November.