Icelandic names of the geological eras

Cambrian
1) fornlífsbernska (fornlífs- (paleozoic) + bernska (infancy))
2) frumvelska tímabilið, valbretlandsbernskan (The British geologist Adam Sedgwick, who established the period, named it after Cambria, the Latin name for Wales, where Britain's Cambrian rocks are best exposed.) Cambrian explosion: fornlífsmikluhvellur (Paleozoic big bang),
2) frumvelska sprengingin

Ordovician
1) Fornlífsæska
2) Orðvíska tímabilið (This era was called after the Celtic tribe of the Ordovices (Orðvíkingur - Orðvískur)

Silurian
eygotneska tímabilið (The Silurian system was first identified by British geologist Sir Roderick Impey Murchison, who was examining fossil-bearing sedimentary rock strata in south Wales. He named the sequences for a Celtic tribe that lived in South Wales, the Silures. An older name for the epoque was "gotlandian", after the Swedish island of Gotland.)

Devonian
Dufneska tímabilið (The name "Devon" derives from the kingdom of Dumnonia (Dumn- adapts as Dufn- in Icelandic), which was home to the tribe of Celtic people who inhabited this area of the southwestern peninsula of Britain at the time of the Roman invasion in AD 43, Dumnonii—possibly meaning "Deep Valley Dwellers" or "Worshippers of the god Dumnonos". )

Carboniferous
Koltímabilið

Permian
Fornlífshaust (last epoque of the paleozoic)

Triassic
Þrenndartímabilið (The Triassic was named in 1834 by Friedrich Von Alberti from the three distinct layers (Latin trias meaning triad, Icelandic þrenning, þrennd)

Jurassic
Eðlumiðaldir (the middle ages of the reptiles. The mesosoicum is sometimes nick-named “age of reptiles” and the Jurassic is the middle epoque of that era, where the largest animals that ever lived came into being.

Cretacious
Rithallstímabilið (Rithallur (writing stone = chalk, Krít is a loan-word)

Paleocene
Nýlífsbernskan (Kaenozoic infancy)

Eocene
Nýlifsæskan (Kaenozoic youth)

Oligocene
Fánýlífsöld?

Miocene

Pliocene