Ƙirƙirar wani nau'i mai mahimmanci na wannan jumla Wasu bogs sun kiyaye bishiyar bog-kamar tsohuwar itacen oak mai amfani a cikin dendrochronology.
Tabbas, wani nau'i mai rikitarwa na jumla shine "Wasu bogs sun adana katako na katako irin su tsofaffin bishiyoyi masu amfani a cikin dendrochronology, kuma sun ba da kyauta sosai ga jikin bog, tare da gabobin, fata, da gashi ba tare da lalacewa ba, an binne su a can dubban shekaru da suka wuce bayan bayyane na Germanic da Celtic hadaya ta mutum. "