Geologic time scale

when did the cenozoic era end

it hasnt ended, present day

when did the cenozoic era begin

it began 66 ma

when did the mesozoic era end

it ended 66ma

when did the mesozoic era begin 

it began 251 ma 

when did the paleozoic era end

it ended 251 ma

when did the paleozoic era begin

it begain 542 ma

when did the proterozoic era end

it ended 542 ma

when did the proterozoic era begin

2500ma 

when did the pleistocene epoch end and begin

it ended 12,000 years ago, it began 2.6 million years ago

when did the holocene epoch end and begin

it hasnt ended, it began 12,000 years ago

when did the paleocene epoch end and begin

it ended 55.8 ma and begain 66 ma

what is the order of periods in the mesozoic era from oldest to youngest 

triassic, jurassic, cretaceous 

when did the cambrian period end and begin

it ended 488 ma and begain 542ma

when did the permian period end and begin

it ended 251 ma and began 299 ma