| 31. | The Quaternary Period began about and continues today.
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| 32. | It has been created due to faulting and formed in volcanic soil during the Quaternary period.
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| 33. | Sand dunes were much more widespread and active in many areas during the early Quaternary period.
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| 34. | Until 1920, 34 wells have been drilled to draw Quaternary period stored water from the ground.
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| 35. | Thus bay muds are important time records of glacial activity and streamflow throughout the Quaternary period.
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| 36. | She studied pollen deposits during the Quaternary period.
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| 37. | The more recent marine invertebrates of Washington from the Quaternary period were generally adapted to cold climates.
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| 38. | During the Quaternary period, the last 2 million years, the area has experienced a sequence of glaciations.
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| 39. | Glaciation during the present Quaternary Period has left widespread estuarine alluvium, peat and blown sand are abundant.
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| 40. | The cliffs overlooking Steamer Lane are composed of Quaternary period marine deposits, part of the Purisima formation.
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