where is this era's name derive from?
It means "new life," and is derived from Greek "kainós" "new," and "zōḗ" "life."
Cenozoic
meaning "new life," is derived from Greek "kainós" "new," and "zōḗ" "life." 
where was the material that was eroded by the colorado river deposited Regions in the Mesozoic and Cenozoic what is the second one? It is the current and most recent of the three geological eras of the Phanerozoic Eon.
wiki:1619300
Cenozoic [SEP] Nomenclature
"Cenozoic," meaning "new life," is derived from Greek "kainós" "new," and "zōḗ" "life." The era is also known as the "Cænozoic", "Caenozoic", or "Cainozoic" (). The name "Cenozoic" (originally: "Kainozoic") was proposed in 1840 by the British geologist John Phillips (1800–1874).