Chetro Ketl had some veneers (patterns may indicate a widespread style ) that are the result of highly skilled masons, and the doors often had sills of carefully ground flat stone.
Aside from structural considerations, some veneers are the result of highly skilled masons working within well-developed craft traditions. Recurring veneer patterns may indicate a widespread style used during a particular period, or they may suggest the work of a specific social group or line of builders. Doors and vents often had sills of carefully ground flat stone slabs and lintels constructed from a row of thin wood beams. 
