I do know that it completely obscured the rock rock (and the big boulder on the right was broken down nearer the cliff). We had 15 people working on it for about 10 hours, took about 20 buckets to Lesley's shed and left lots of big rocks on the beach.
Perhaps an engineering type could do some calculations?
|The rock fall|
|The rock fall rock on the "rock rock"|
|The rock fall (rock removed) with buckets for scale|