| 41. | The bedrock beneath the area was created by basalt flows laid down during the Pliocene and Pleistocene epochs.
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| 42. | This population is believed to be a relict from the Pleistocene epoch when the climate was cooler and wetter.
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| 43. | Computer specialists, many of whom viewed Sunday's exercise as a throwback to the Pleistocene epoch, are even more impatient.
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| 44. | Suttle Lake is the result of glaciation during the Pleistocene Epoch, when the Cascade Mountains were buried in ice.
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| 45. | This advance is not comparable to continental glaciation that occurred during the Wisconsin Ice Age of the Pleistocene epoch.
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| 46. | Additional uplift of the Guadalupe Mountains in the Pliocene and early Pleistocene epochs enlarged Carlsbad Cavern and nearby caves.
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| 47. | The bedrock beneath the Fossil Lake area was created by basalt flows laid down during the Pliocene and Pleistocene epochs.
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| 48. | It consists of bones of mammals from the Pleistocene epoch of the Coenozoic era and shells of elasmobranchii and gastropods.
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| 49. | Although humans existed in the previous Pleistocene epoch, it is only in the recent Holocene period that they have flourished.
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| 50. | Several pluvial lakes formed in what is now the southwestern United States during the glaciation of the late Pleistocene epoch.
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