user: Question: What is the formation that had the specimen discovered before 2001 and is in an Indianapolis, INdiana museum?
Columns: ['Name', 'Discovered', 'Museum', 'Museum city', 'Discoverer', 'Formation', 'Location']
Types: ['text', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Wankel', 1988.0, 'Museum of the Rockies', 'Bozeman, MT', 'Kathy Wankel', 'Hell Creek Formation', 'Montana']
SQL:

assistant: SELECT "Formation" FROM "Table" WHERE "Discovered" < 2001.0 AND "Museum city" = 'Indianapolis, IN';