8 . 4 — 2 0 . 0 ▁My a . ▁Before ▁it ▁was ▁re cons ider ed ▁to ▁be ▁close ▁to ▁the ▁ancest ry ▁of ▁hem icy on ines , ▁Ce phal og ale ▁was ▁once ▁considered ▁to ▁be ▁an ▁ancest or ▁of ▁all ▁be ars . ▁ ▁F oss il ▁distribution ▁D ě ta ň , ▁Czech ▁Republic ▁about ▁ 3 3 . 9 — 2 8 . 4 ▁My a ▁Cet ina ▁de ▁Arag on , ▁Spain ▁about ▁ 2 2 . 4 — 2 0 ▁My a ▁Stand ing ▁Rock ▁Qu ar ry , ▁Z ia ▁Sand ▁Form ation , ▁Sand oval ▁County , ▁New ▁Mexico ▁about ▁ 2 4 . 8 — 2 0 . 6 ▁My a ▁Ag ate ▁Spr ings ▁Qu ar ries , ▁Si oux ▁County , ▁Neb r aska ▁about ▁ 2 3 – 5 . 3 ▁My a ▁Hem ing ford ▁Qu ar ry ▁ 1 2 D , ▁Running water ▁Form ation , ▁Box ▁But te ▁County , ▁Neb r aska ▁about ▁ 2 0 . 6 — 1 6 . 3 ▁My a ▁ ▁References ▁ ▁Category : O lig oc ene ▁can iform s ▁Category : Pre histor ic ▁m amm als ▁of ▁North ▁America ▁Category : Pre histor ic ▁m amm als ▁of ▁Europe ▁Category : O lig oc ene ▁m amm als ▁of ▁North ▁America ▁Category : M i oc ene ▁be ars ▁Category : F oss il ▁tax a ▁described ▁in ▁ 1 8 6 2 <0x0A>