Question: where is the oldest known rock on earth located
[{'answer': 'Hudson Bay in northern Quebec', 'provenance': [{'wikipedia_id': '4087668', 'title': 'Oldest dated rocks', 'start_paragraph_id': 14, 'start_character': 200, 'end_paragraph_id': 14, 'end_character': 229, 'bleu_score': 1.0, 'section': 'Section::::Oldest rocks by category.:Oldest rock on Earth.\n'}]}, {'provenance': [{'wikipedia_id': '4087668', 'title': 'Oldest dated rocks', 'start_paragraph_id': 14, 'start_character': 0, 'end_paragraph_id': 14, 'end_character': 551, 'bleu_score': 0.978375183951072, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1856402804817945244}, 'section': 'Section::::Oldest rocks by category.:Oldest rock on Earth.\n'}]}]