There is no problem about the walls standing at Gavrinis , Petit Mont, Barnenez etc.. They used walling , something entirely different from quartz cobbles ,and suited for the job .
It shouldn’t be difficult to work out the volume of quartz used in the façade then compare it with what had been discovered at the site .
O’ Kelly commented “"A good quantity was shattered and could not be used " on the facade ,and how the volume " decreased gradually in amount and extent " ,whereas the facde maintains a solid homogenous wall . Where did it come from ? It doesn’t quite add up .
If nothing else it shows that what see was not typical of the finds .But even what we see ,i.e. the more usable stuff , still needs the steel and concrete to stay up .
