No volcanic ignimbrites younger than 3,800,000 million years are found in the Eastern Cordillera .
In the Frailes region volcanic activit has continued into the Holocene with the Nuevo Mundo volcano .
No volcanic ignimbrites younger than 3,800,000 million years are found in the Eastern Cordillera , although in the Frailes region volcanic activit has continued into the Holocene with the Nuevo Mundo volcano .