What would cause this

[Sallysue]

On this old Indian camp there are several on these twisted trees https://images.google.com/imgres?im...id=EAYuhUjTCJZ_xM:&w=236&h=314&source=sh/x/im

 

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[miboje]

Could be acts of nature, or could have been manipulated by man.

 

[kingskid1611]

On some of your tree pics they have been struck by lightning. The one with the bark missing in a streak down the side is a direct lightning strike. Now some of the twist can occur in nature. Some of the more pronounced twist would have to be manipulated by man.