Admittedly , in 2011 Horner had published an histological study showing that all Triceratops specimens investigated possessed a subadult bone structure .
The sample had been too small to allow for a valid generalisation to all Triceratops fossils .
Admittedly , in 2011 Horner had published an histological study showing that all Triceratops specimens investigated possessed a subadult bone structure , but the sample had been too small to allow for a valid generalisation to all Triceratops fossils .