Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_203_645 ( id number, "lower mississippi periods" text, "lower yazoo phases" text, "lower yazoo\ndates" text, "tensas/natchez phases" text, "cahokia phases" text, "cahokia dates" text, "ohio/miss. river\nconfluence phases" text, "ohio/miss. dates" text )

### Question ###
routh or lake george is a lower yazoo phase ?

### Accurate SQL ###

SELECT "lower yazoo phases" FROM table_203_645 WHERE "lower yazoo phases" IN ('routh', 'lake george')