ed ▁in ▁a ▁stone ▁tank ▁he ated ▁by ▁a ▁pe at ▁fire . ▁ ▁D ating ▁of ▁materials ▁exc av ated ▁from ▁the ▁m ound ▁indicate ▁that ▁the ▁site ▁was ▁in ▁use ▁between ▁ 1 2 0 0 ▁and ▁ 5 0 0 ▁BC . ▁ ▁Altern ate ▁interpret ations ▁ ▁There ▁are ▁more ▁than ▁ 2 0 0 ▁known ▁bur nt ▁m ounds ▁in ▁Or k ney ▁and ▁almost ▁as ▁many ▁known ▁in ▁Sh et land . ▁They ▁are ▁also ▁found ▁throughout ▁the ▁British ▁Is les . ▁O ' K elly ▁suggested ▁that ▁bur nt ▁m ounds ▁represent ▁temporary ▁hunting ▁cam ps ▁used ▁for ▁cook ing ▁joint s ▁of ▁meat . ▁However , ▁b one ▁is ▁only ▁occasionally ▁reported ▁from ▁bur nt ▁m ound ▁sites , ▁as ▁at ▁L iddle , ▁which ▁might ▁seem ▁unusual ▁for ▁a ▁cook ing ▁site . ▁ ▁This ▁has ▁been ▁explained ▁by ▁the ▁so ils ▁being ▁too ▁acid ic ▁for ▁the ▁b one ▁to ▁be ▁preserved , ▁but ▁it ▁would ▁seem ▁unlikely ▁that ▁all ▁of ▁the ▁so ils ▁rel ating ▁to ▁bur nt ▁m ounds ▁were ▁so ▁acid ic ▁that ▁no ▁b one ▁surv ived , ▁particularly ▁as ▁the ▁p H ▁of ▁the ▁soil ▁will ▁vary ▁consider ably ▁from ▁site ▁to ▁site . ▁There ▁are ▁examples ▁of ▁bur nt ▁m ounds ▁on ▁neutral ▁or ▁basic ▁so ils , ▁without ▁b one ▁being ▁apparent . ▁It ▁has ▁also ▁been ▁suggested ▁that ▁bur nt ▁m ounds ▁were ▁sa unas ▁or ▁used ▁in ▁salt ▁or ▁le ather ▁prepar ation .