The 20-metre limb landed on 25 graves, and was discovered by Cemetery Trust honorable secretary treasurer Jack Adriaans when he opened the cemetery for Father's Day.

"It's minimal damage considering the size of the limb," he said.

Mr Adriaans said the 105-year-old pine trees had lost some branches over the years, but nothing like this had happened.

"It's a shame because it's such a lovely monument," he said.

Mr Adriaans said the trust was trying to contact the families of the graves but was finding it hard.

"It's hard to keep track of people over the generations," he said.

He said the trust was not responsible for the graves but it was permitted to make the cemetery safe.

The trees were planted in 1901 and, to the trust's knowledge, were last pruned in 1902.

The trees were planted around the perimetre of the cemetery but some were cut down and sent to the mill.

"These trees were left because they weren't of any value for milling," Mr Adriaans said.

He said the trust would make some decisions on the future of the old trees to ensure the cemetery was safe.

Sexton and maintenance worker Alan Graham was busy cleaning the fallen tree last week. Once cut up, the smaller branches were burnt while the bigger logs were milled.