question: When did the Caledonian Orogeny occur ?
answer: c. 488 -- 444 Ma and early Silurian period
turker_answer: The Caledonian Orogeny occurred c. 488 -- 444 Ma and early Silurian period .
rule-based: The Caledonian Orogeny occurred in c. 488 -- 444 Ma and early Silurian period .