este ven ▁Forest . ▁ ▁History ▁ ▁The ▁site ▁ ▁The ▁r idge ▁of ▁Jur ass ic ▁land ▁which ▁lies ▁to ▁the ▁west ▁of ▁Bour ne ▁in ▁Lincoln shire , ▁England , ▁over look s ▁the ▁town ▁and ▁the ▁rec laimed ▁f ens ▁to ▁its ▁east . ▁ ▁This ▁statement ▁should ▁not ▁however , ▁be ▁allowed ▁to ▁give ▁an ▁impression ▁of ▁great ▁alt itude . ▁This ▁is ▁a ▁region ▁of ▁very ▁gentle ▁relief . ▁ ▁The ▁fen ▁edge ▁is ▁at ▁an ▁alt itude ▁of ▁about ▁seven ▁metres ▁and ▁ 2 ½ ▁kilometres ▁away , ▁the ▁highest ▁ground ▁in ▁the ▁wood ▁is ▁at ▁about ▁ 5 8 ▁metres . ▁ ▁The ▁Jur ass ic ▁b eds ▁( cl ay ▁and ▁sand y ▁cl ay ) ▁are ▁c apped ▁by ▁gla cial ▁till ▁or ▁b ould er ▁cl ay , ▁left ▁from ▁gla ci ations ▁that ▁occurred ▁in ▁the ▁British ▁Is les ▁during ▁the ▁Ang li an ▁and ▁Wol ston ian ▁stages ▁respectively 1 . ▁ ▁In ▁former ▁times , ▁this ▁till ▁made ▁the ▁land ▁too ▁difficult ▁for ▁the ▁early ▁far mers ▁to ▁use ▁as ▁a rable ▁land ▁and ▁too ▁wet ▁and ▁t ena cious ▁to ▁be ▁ideal ▁for ▁past ure . ▁ ▁It ▁is ▁natural ▁therefore , ▁to ▁find ▁that ▁much ▁of ▁it ▁has ▁been ▁left ▁as ▁wood land , ▁which ▁was ▁in ▁itself , ▁a ▁valuable ▁resource ▁for ▁fuel ▁and ▁construction al ▁material . ▁ ▁As ▁far ▁south ▁as ▁Bour ne ▁though , ▁the ▁remaining ▁strip ▁of ▁gla cial ▁till ▁is ▁narrow ▁and