About 20 % of the hadrosaur 's bones were enveloped by calcareous concretions .
Every single bone not found in a concretion bore many closely spaced ovualar conical depressions .
About 20 % of the hadrosaur 's bones were enveloped by calcareous concretions but every single bone not found in a concretion bore many closely spaced ovualar conical depressions .