Sad indeed, He was both inspiring and at times terrifying
I was one of his students and the ringing WRONNNNNGGG as I pointed out the wrong layer in a complex unconformity will remain with me for ever, as will the "Mr Kendall, My office" that rang out as you walked into the department and he spotted you, and you were either late with something or he wanted something from you
On the plus side it was his help and support that allowed to do my undergraduate mapping exercise in a caving area and gave me the contacts I needed (I have a friend called Ben runs an outdoor centre where you will be able to stay!), and I know that many students were helped out by him in many ways during his time at the university, and many cavers the same
RIP indeed