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Figure 5.5A. (Top left) Modern ooids heated for one-half hour in kiln. (a) Control, not heated. (b) Heated to 176°C. (c) heated to 400° C. (d) heated to 625°C. Note in (d) that outer surface of ooids is calcined (white color) but inner parts of individual ooids are dark grey to black. 5.5B. (Top right) Fragment of well-cemented coralline limestone (a) and Porites coral (b) heated together at approximately 400°C for one-half hour. Note only the coral blackened. 5.5C. (Bottom) Soilstone crusts: (a) heated to approximately 400°C for one-half hour. (b) Unheated.

Return to: Field Observations and Some Experimental Results | Discussion

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