Okay, here's a map screenie of where the freeze-dried mammoth is: mammoth is in the ice-wall just ahead of the character pointer. Yes, it is below the Lighthouse/Hob's Fall area.
http://imageshack.us/photo/my-images/535/mammothlocation.jpg/
You can get a tusk and snout off of it if I remember correctly.
Had a weird encounter yesterday west of Whiterun. Was off-roading back to Whiterun in the middle of the day and saw a group of four walking in the same direction. I thought it was strange because it wasn't the normal Stormcloak, Imperial, Thalmore type group. Nearly got within speaking range when one of them turns and starts swinging a battle axe. Turns out it was three bandits and, of all things, a frost spell-casting skeleton. Took two wacks to drop the skeleton. Used the disarm shout to take down a bandit. Janessa got the rest.