▁number ▁of ▁items ▁of ▁interest , ▁such ▁as ▁a ▁cast - ir on ▁mil estone ▁and ▁various ▁horse - ▁and ▁tra ctor - dra wn ▁pl ough s , ▁wh in ▁cr ushing ▁stone , ▁etc . ▁ ▁Education ▁School ▁groups ▁can ▁visit ▁the ▁mill ▁as ▁part ▁of ▁their ▁studies ▁and ▁are ▁given ▁gu ided ▁t ours ▁and ▁/ ▁or ▁specific ▁tal ks ▁on ▁the ▁many ▁topics ▁which ▁are ▁covered ▁by ▁the ▁trust ' s ▁collections . ▁The ▁rivers ide ▁walk ▁provides ▁many ▁opportun ities ▁for ▁various ▁studies , ▁such ▁as ▁river ▁life , ▁wild flow er ▁me adows , ▁b iod iversity , ▁ge ography , ▁ge ology , ▁etc . ▁The ▁water ▁wheel ▁gives ▁a ▁focus ▁for ▁studying ▁sust ain ability . ▁ ▁Other ▁features ▁of ▁interest ▁ ▁Cup ▁and ▁ring ▁mark ▁stone ▁ ▁A ▁type ▁of ▁pet rog lyph ▁called ▁a ▁cup ▁and ▁ring ▁mark ▁stone ▁is ▁recorded ▁as ▁existing ▁at ▁Dal gar ven ▁by ▁John ▁Smith , ▁the ▁notable ▁A yr shire ▁anti qu arian . ▁Unfortunately ▁the ▁exact ▁where about s ▁of ▁the ▁stone ▁is ▁unknown ; ▁however ▁a ▁copy ▁has ▁been ▁produced ▁and ▁is ▁on ▁display ▁in ▁the ▁grounds ▁of ▁the ▁mill . ▁The ▁purpose ▁of ▁cup ▁and ▁ring ▁marked ▁stones ▁is ▁unknown . ▁The ▁car v ings ▁on ▁the ▁original ▁stone ▁would ▁have ▁dated ▁from ▁the ▁Ne ol ith ic ▁or ▁Bron ze ▁Age ▁times , ▁being ▁as ▁old ▁as ▁ 6 0 0 0 ▁years . ▁This ▁Dal gar ven ▁example ▁is ▁unusual ▁in ▁having