| 11. | The region was once on the southern coast of the ancient supercontinent of Laurasia.
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| 12. | The rodent fossil record dates back to the Paleocene on the supercontinent of Laurasia.
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| 13. | Later, they separated into Gondwana and Laurasia.
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| 14. | The Carboniferous was a time of active South China continents were still separated from Laurasia.
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| 15. | This margin existed until Laurasia and Gondwana collided in the Waco Austin San Antonio trend.
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| 16. | Fossil taxa are known from throughout Laurasia.
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| 17. | Proto-Laurasia and Proto-Gondwana were separated by the Proto-Tethys Ocean.
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| 18. | The clockwise motion of Laurasia led much later to the closing of the Tethys Ocean.
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| 19. | The Litopterna occupied ecological roles as browsers and grazers similar to horses and camels in Laurasia.
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| 20. | The predominant theory suggests that rodents first evolved in Laurasia, and expanded outward from there.
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