最終更新日：2025/11/29
The shale beds in the upper formation are largely nonfossiliferous, offering limited evidence for reconstructing the region's ancient ecosystems.
正解を見る
The shale beds in the upper formation are largely nonfossiliferous, offering limited evidence for reconstructing the region's ancient ecosystems.
音声機能が動作しない場合はこちらをご確認ください
編集履歴（0）
