Read Edit View history 渐新统 jiànxīntǒng Oligocene system Origin Definitions Defs Strokes Stroke Words Sentences Sents created sense approved 渐新统/漸新統 · jiànxīntǒng · Oligocene system 2026/03/04 渐新统 / 漸新統 jiànxīntǒng Oligocene system Oligocene system (geology) 渐新统的地层中发现了大量的哺乳动物化石。 verb created sense Mar 4, 2026, 02:25 AM