▁near ▁Dev ils ▁Post p ile ▁National ▁Monument , ▁in ▁eastern ▁Mad era ▁County ▁of ▁central ▁California . ▁They ▁are ▁within ▁the ▁eastern ▁Sierra ▁Nev ada ▁and ▁In yo ▁National ▁Forest . ▁ ▁Vol can ic ▁ge ology ▁The ▁Red ▁Con es ▁last ▁er upt ed ▁approximately ▁ 5 0 0 0 ▁years ▁ago , ▁with ▁both ▁c inder ▁er u ption ▁( form ing ▁the ▁con es ), ▁and ▁a ▁bas alt ▁flow ▁from ▁the ▁southern ▁cone , ▁which ▁flow ed ▁approximately ▁ ▁towards ▁the ▁upper ▁Middle ▁F ork ▁of ▁the ▁San ▁Jo aqu in ▁River . ▁ ▁The ▁Red ▁Con es ▁are ▁at ▁the ▁southern ▁end ▁of ▁the ▁Mon o - In yo ▁C rat ers , ▁the ▁mag ma ▁for ▁the ▁Red ▁Con es ▁shares ▁its ▁origin ▁with ▁the ▁other ▁Mon o - In yo ▁cr aters . ▁ ▁See ▁also ▁Long ▁Valley ▁cal der a ▁Pan um ▁Cr ater ▁ ▁References ▁ ▁Category : C inder ▁con es ▁of ▁the ▁United ▁States ▁Category : Vol cano es ▁of ▁Mad era ▁County , ▁California ▁Category : In yo ▁National ▁Forest ▁Category : Land forms ▁of ▁the ▁Sierra ▁Nev ada ▁( U . S .) ▁Category : Vol cano es ▁of ▁California <0x0A> </s> ▁Search ▁the ▁Sky ▁is ▁a ▁sat ir ical ▁science ▁fiction ▁novel ▁by ▁American ▁writers ▁Freder ik ▁P ohl ▁and ▁Cy ril ▁M . ▁K orn bl uth , ▁first ▁published ▁in ▁ 1 9 5 4 ▁by ▁Ball antine ▁Books . ▁ ▁Plot ▁summary ▁ ▁H alse