Question: where are the oldest rocks found in a syncline
[{'answer': 'opposite side of the hinge', 'provenance': [{'wikipedia_id': '1146946', 'title': 'Syncline', 'start_paragraph_id': 3, 'start_character': 183, 'end_paragraph_id': 3, 'end_character': 209, 'bleu_score': 1.0, 'section': 'Section::::Characteristics.\n'}]}, {'provenance': [{'wikipedia_id': '1146946', 'title': 'Syncline', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 402, 'bleu_score': 0.9712154609069981, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16654717277194599025}, 'section': 'Section::::Characteristics.\n'}]}]