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adventure america arid badlands cenozoic era clarno clarno palisades cliffs climate colorful conservation desert dry eastern eastern oregon environment floodplain fossil fossil record high desert hiking john day fossil beds john day fossil beds national monument john day river basin landscape national monument national park service nature oregon oregon river basin painted painted desert painted hills palisades park recreation reservation riparian river basin rock sand scenic semi-desert shrublands soil tourism tourist attraction united states us usa

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