My home is wooden stud construction with rough limestone block veneer. I have lots of gaps that have opened up where the top of the veneer meets the soffit. It looks like these gaps were originally closed with mortar or a similar material.
Image attached is an example and show some small cracking. In some areas the gap is up to an inch wide where this brittle material is breaking away.
What is the best way to repair this? Caulk? If so, what type? Or does a similar mortar type material need to be used?