. Bulletin of the British Museum (Natural History), Mineralogy. SEDIMENTATION IN NORTHERN CARDIGAN BAY. Fig. 15. Distribution of quartz grains with semi-composite extinction and vacuole inclusions. Contour interval 2-0%.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)

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