Bumbanian From Wikipedia, the free encyclopedia The Bumbanian is an Asian Land Mammal Age (ALMA), a large biozone which corresponds to ages between 55.8–46.8 Ma for finds of fossil mammals in Asia. This zone lies within the Ypresian stage of the Eocene series. It follows the Gashatan ALMA and precedes the Arshantan ALMA.[1] ↑ Paleo Database: Bumbanian vtePaleogene PeriodPaleocene EpochEocene EpochOligocene Epoch Danian Selandian Thanetian Ypresian Lutetian Bartonian Priabonian Rupelian Chattian This geochronology article is a stub. You can help Wikipedia by expanding it.vte Related Articles~TimelinesTop QsFact Checks