Most often,they were not as wide as the typical,"Paddle bow" style bow,attributed to Ca bows.They were short sinew backed bows,with recurved limb tips that featured the built up sinew nocks,that you see in the pics posted.Often,they were made of Cedar.
In my oppinion,based on research and early pics of early bows,i dont believe,that bows were made and used with as much reflex as they show in museums today.From pics of early bows in native hands,i dont see the effect of nearly as much reflex as we see in them today.Ishis bows are a prime example.Due to limited weather protection,or even the lack of in some cases,i believe that the high extent of reflex in museum specimens today,has been increased over the years from repeated exposure to hydration and dehydration.Just a theory,that has been festering in me for some time now.LOL