Final answer:
The author provides foreshadowing at the end of Chapter Fifteen in 'My Side of the Mountain'.
Step-by-step explanation:
In 'My Side of the Mountain', the author provides foreshadowing at the end of Chapter Fifteen. The foreshadowing can be seen in the description of the shadows lengthening down the sage-slope and the comparison of these shadows to the shadows gathering and closing in around Jane Withersteen's life.
This foreshadows a dark and uncertain future for the main character. The author's use of imagery and symbolism helps create a sense of foreboding and anticipation for what is to come.