Teacher:In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
Teacher: Now, understand the problem? Solve this instance: Context: . It is dated at 277 Ma, Early Permian in age, within the range of intrusion ages for the granites that make up the Cornubian batholith. Link Information: The Cisuralian is the first series/epoch of the Permian. Question: How long did the period which Haig Fras was dated last?
Student:
Answer: 21 million years