| 21. | Head also formed in the periglacial circumstances by breaking off rock fragments and mixing with dirt.
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| 22. | Rock fragments in this are shales and cherts.
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| 23. | Fine-grained volcanic ash, crystal and rock fragments comprise the matrix of the second major pyroclastic flow deposit.
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| 24. | This cliff exposes several layers of black columnar basaltic lava flows with distal rock fragments and jointing.
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| 25. | Proponents of the Indiana University method would say that information is lost by not counting rock fragments.
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| 26. | Scientists said ground-hugging clouds of ash and rock fragments sped down Mayon's slope presenting the greatest danger.
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| 27. | Quartz or mica and an admixture of carbonates, siliceous rock fragments or organic remains may be common.
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| 28. | Rounding of rock fragments is less common in the mesothermal regime, as the formational event is brief.
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| 29. | The orthoclase crystals are interpreted to represent rock fragments that became enveloped during hardening of the dacitic lavas.
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| 30. | By flood or slope mass movement of regolith, rock fragments were moved to form a low-relief slope landform.
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