/lit/, can you help me remember the name of a book?

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Okay /lit, I'm trying to remember a book that I read many years ago in middle school, and I'm hoping you guys can help, here's what I remember.

>Pretty sure it was a prehistoric tribe, definitely hunter/gatherers
>I recall them migrating and also coming across a beach, referring to the sea people or some shit like that
>at one point, one of the male hunters in the group broke a leg or arm, and the younger female had to bind it correctly so he could hunt again eventually
>younger female and I think her brother had to cross a dangerous glacier for some reason I don't remember
>also remember a part about them camping out and seeing a carving in a rock from another tribe that warned of active spirits in the area or some shit like that
>i think at some point they were caught in a blizzard

I know it's not a lot to go off of, but I'm hoping someone will remember it. I read this book in like 6th grade so it was a long ass time ago. Thanks, /lit/