PENTAX *ist DS images oak tree knotches

Oak notches,pentax *ist DS,lens sigma 70-300mm Apo,camera mode aperture priority,aperture f11,shutter speed 1/10sec,sensitivity 400,multi segment metering,white balance daylight,lens set to 300mm.I found the knotches have created some rather interesting bark paterns with the aging of the tree which i think is around 500 years old.