By using radiometric dating techniques , the volcanic tuffs and lavas , faunal correlation and magneto-stratigraphy , the strata in which the fossils were found were estimated to date between NUMBER@1 and NUMBER@2 million years ago , during the MISC@1 .

ORGANIZATION@1 tugenensis which the fossils were found were estimated to date between NUMBER@1 and NUMBER@2 million years ago , during the MISC@1 .
