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 horse named Winston Churchill won a race at Uttoxeter on the 50th anniversary of the former prime minister's death today.
Cold with clear spells in southeast at first, cloud across the rest of the region then spreading to all parts.
Milder but breezy with a good deal of cloud and one or two brighter intervals further east.