A giant inland sea cut right across North America ... leaving us with only half the picture of North America’s ancient life. Still, Canada’s prairies are full of clues about the continent ...
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Carlsbad Caverns: New Mexico's otherworldly caves with gypsum flowers and 'soda straws' dangling from the ceilingCarlsbad Caverns is a maze of underground caves born from an ancient tropical reef. The caverns house North America's largest ... on the shores of a shallow inland sea. The tropical climate ...
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