Mammoth Skulls -Mystery

I found a note called “Waterstained Note” on a beach where it says that there is a some sort of treasure or similar “inside the northernmost pillar, across the river, beneath a mammoth skull”. After searching for a long time, I haven’t yet found it but I have noticed that in many of the Ymir’s Children -NPC camps there are skulls that look like mammoth skulls laying around. Still there are no pillars beneath them and I haven’t been able to smash those skulls as adviced in the note. Can anyone help me solve this mystery? Any help would be appreciated.

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