This burial mound was excavated in 1903, and apparently contained 8 m³ of ashes.
Här låg nämligen på den ursprungliga marken ett mycket intensivt lager af aska utbredt öfver ett vidsträckt, 20 kv. m. stort område, 5 m. i SV. NO. och öfver 4 m. i SO. NV. Asklagrets djup var 40 cm.
Here lay on the bare ground a "very intensive" layer of ashes on a wide, 20 m² area, 5 m SW-NE and more than 4 m SE-NW. The depth of the ash-layer was 40 cm.
Some more quotes following comments:
I ofantligt stor myckenhet förekom här brända människoben. Jag har ej i någon graf tillvaratagit en så stor mängd.
Here was an extreme mass of burned human bones. I have never in any other grave found so many.
According to the formula in this paper that I found by random googling, 8 m³ of ashes could mean 2000 corpses.
(The mound was thought to be from the "Viking Age".)
Let us assume it was a mass burial, e.g. after a battle. Clearly there are many other possibilities, but I am interested in an "upper limit" on the number of human corpses, not the likelihood of this or that.
Assuming it is from AD 750, how well preserved would the ashes be? Could it be a much larger number of corpses because the layer has been compressed?
Anything else I am missing?