Question: what land mass was north america a part of about 300 million years ago
[{'answer': 'Pangaea or Pangea', 'provenance': [{'wikipedia_id': '19654281', 'title': 'Pangaea', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 17, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Pangaea', 'provenance': [{'wikipedia_id': '19654281', 'title': 'Pangaea', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 7, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '19654281', 'title': 'Pangaea', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 517, 'bleu_score': 0.9451526628827591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18154650581615218025}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '19654281', 'title': 'Pangaea', 'start_paragraph_id': 19, 'start_character': 0, 'end_paragraph_id': 19, 'end_character': 370, 'bleu_score': 0.943481971234232, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18154650581615218025}, 'section': 'Section::::Rifting and break-up.\n'}]}, {'provenance': [{'wikipedia_id': '19654281', 'title': 'Pangaea', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18154650581615218025}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '19654281', 'title': 'Pangaea', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['Pangaea or Pangea () was a supercontinent that existed during the late Paleozoic and early Mesozoic eras. It assembled from earlier continental units approximately 335 million years ago, and it began to break apart about 175 million years ago.', 'Pangaea or Pangea () was a supercontinent that existed during the late Paleozoic and early Mesozoic eras. It assembled from earlier continental units approximately 335 million years ago, and it began to break apart about 175 million years ago. In contrast to the present Earth and its distribution of continental mass, much of Pangaea was in the southern hemisphere and surrounded by a superocean, Panthalassa. Pangaea was the most recent supercontinent to have existed and the first to be reconstructed by geologists.', 'Pangaea or Pangea () was a supercontinent that existed during the late Paleozoic and early Mesozoic eras. It assembled from earlier continental units approximately 335 million years ago, and it began to break apart about 175 million years ago. In contrast to the present Earth and its distribution of continental mass, much of Pangaea was in the southern hemisphere and surrounded by a superocean, Panthalassa.']}}]}]