Turkey oak with longitudinal crack at rear

[DanVC]

Hi guys,

 

Few pics below of an oak in local park which has a large crack about 20ft long at the rear.  The garden cane in the pic is 60 cm and I probed at three points and the cane kept going, tried the three points again with a meter of steel cable and lost it almost.  Some occlusion further up the stem no p&d evident. Its down for annual monitoring now but I think some invasive investigation is needed given its location, any thoughts on next steps??

 

Cheers

[Mark Bolam]

More pics needed Dan.

Crown and targets in context. Good pull back distance shot.

[DanVC]

Will do, cherrs