| 31. | This genus is known from the Ordovician to the Permian periods.
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| 32. | The Central Graben lies amid the Permian basins and their high.
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| 33. | Poor quality fossil evidence suggests an origin in the Permian Period.
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| 34. | The Carboniferous and Permian are missing from the local rock record.
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| 35. | A gap in the local rock record spanned the Permian period.
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| 36. | The sea had completely vanished by the start of the Permian.
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| 37. | In 1999, Landgraf graduated from Permian High School in Odessa.
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| 38. | This family dates back to the late Carboniferous and early Permian.
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| 39. | Many of the sons would play football for Permian High School.
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| 40. | The new venture will combine the two companies'Permian Basin operations.
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