. Bulletin of the British Museum (Natural History), Mineralogy. 98 CARBONATITES OF THE CHILWA SERIES, S. NYASALAND The larger vents range in diameter from one nearly 4 miles in diameter (Muambe, in Portuguese East Africa, referred to in the preceding paragraph) to one only \ mile across, and there are seven smaller vents whose diameters are no more than a few PART OF SOUTHERN NYASALAND Fig. 1 To quote Dr. Dixey (1937: 7): The vents typically assume the form of composite necks, and they are characterized by the presence of agglomerates or breccias, comprising masses of the intrusive roc
. Bulletin of the British Museum (Natural History), Mineralogy. 98 CARBONATITES OF THE CHILWA SERIES, S. NYASALAND The larger vents range in diameter from one nearly 4 miles in diameter (Muambe, in Portuguese East Africa, referred to in the preceding paragraph) to one only \ mile across, and there are seven smaller vents whose diameters are no more than a few PART OF SOUTHERN NYASALAND Fig. 1 To quote Dr. Dixey (1937: 7): The vents typically assume the form of composite necks, and they are characterized by the presence of agglomerates or breccias, comprising masses of the intrusive rock, usually the fel- spathic type, set in a base of similar material, or fragments of the country rocks and of earlier intrusives set in a sparse felspathic, calcareous, or other base. Moreover, in at least five of the. 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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