| 31. | The area was covered in red sand that represented Quaternary river terraces.
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| 32. | Quaternary ammonium cations have four organic groups attached to the nitrogen atom.
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| 33. | Exposed materials within the area are limited to serpentinite and quaternary sediments.
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| 34. | Generally speaking, this encompasses pre-Western contact Late Quaternary extinctions.
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| 35. | The commercial deposits of diatomite are restricted to Tertiary or Quaternary periods.
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| 36. | He was the first chemist to synthesize the quaternary amines.
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| 37. | After the first step, a quaternary ammonium iodide salt is created.
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| 38. | Quaternary sediments are buried beneath Bazman's eruption products.
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| 39. | :: : Quaternary is a common word in chemistry.
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| 40. | In 1995 Shackleton became Director of the Godwin Institute for Quaternary Research.
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