| 41. | It lived during the latest Carboniferous and earliest Permian periods in Texas, about 300 million years ago.
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| 42. | They were formed by regional compression and uplift approximately 200 million years ago, during the Permian Period.
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| 43. | The next layer was formed during the Permian Period, which occurred 230 to 270 million years ago.
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| 44. | Most extinct orders of insects developed during the Permian period that began around 270 million years ago.
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| 45. | The surface geology of County Durham is largely confined to rocks dating from the Carboniferous and Permian periods.
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| 46. | The Pangea Supercontinent was added to in the late Permian period when Siberia collided with Baltica and Kazakhstan.
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| 47. | The face is composed of clays and mudstones formed some 255 million years ago, in the Permian period.
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| 48. | This uplift locally created rugged mountains reduced by erosion to their present state largely during the Permian Period.
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| 49. | The millerettids, protorothyrids, and pareiasaurs became extinct in the late Permian period and the procolophonoids during the Triassic.
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| 50. | There are no fossils in Indiana from the interval spanning across the Permian period and the entire Mesozoic era.
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