zer ba ij an , ▁formerly ▁called ▁Len ink ə nd ▁ Ç inar l ı , ▁Sh am kir , ▁A ter ba ij an , ▁also ▁called ▁Len ink end <0x0A> </s> ▁Spring ▁R anch ▁is ▁a ▁g host ▁town ▁in ▁Clay ▁County , ▁Neb r aska , ▁in ▁the ▁United ▁States . ▁ ▁History ▁A ▁post ▁office ▁was ▁established ▁at ▁Spring ▁R anch ▁( also ▁sp elled ▁histor ically ▁Spring ranch ) ▁in ▁ 1 8 7 0 , ▁and ▁remained ▁in ▁operation ▁until ▁it ▁was ▁dis cont in ued ▁ 1 9 4 3 . ▁ ▁References ▁ ▁Category : Ge ography ▁of ▁Clay ▁County , ▁Neb r aska <0x0A> </s> ▁Tre pt ich n us ▁ped um ▁( former ly ▁named ▁Ph yc odes ▁ped um , ▁Many k odes ▁ped um ▁by ▁J . ▁D zik , ▁and ▁also ▁known ▁as ▁Tr ich oph y cus ▁ped um ) ▁is ▁ ▁the ▁preserved ▁bur row ▁of ▁an ▁animal . ▁As ▁such , ▁it ▁is ▁regarded ▁as ▁the ▁earliest ▁w ides p read ▁complex ▁trace ▁foss il . ▁Its ▁earliest ▁appearance , ▁around ▁ 5 4 2 ▁my a , ▁which ▁was ▁contempor aneous ▁with ▁the ▁last ▁of ▁the ▁Ed ia car an ▁bi ota , ▁is ▁used ▁to ▁help ▁define ▁the ▁div iding ▁line , ▁considered ▁ge olog ically ▁at ▁ 5 4 1 ▁my a , ▁between ▁the ▁Ed ia car an ▁and ▁Camb rian ▁Period s . ▁ ▁Tre pt ich n us ▁ped um