Advances in space science and technology. Volume 8 by Frederick I. Ordway

By Frederick I. Ordway

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K i l o m b e caldera, K e n y a . T h e cruciform arrangement of median lateral sector grabens, which reflect the situation of the caldera close t o the junction of the main north-south trending rift valley and an east-west trending spur rift valley. Step-faulting is also evident. 50 G. J. H. MC CALL c c 0) JO CD 2 o o c o g CD 1-flhv Cross-fault /basalt fissure eruption at intersection and in graben ~* Intersecting Grabens Intersecting Grabens , 1 Mile , FIG. 13. T h e structure of the Elmenteita cones, K e n y a (see Fig.

Courtesy G. P. Kuiper, Photographic Lunar Atlas, University of Chicago Press, Chicago. 33 34 G. J. H. M C CALL caused by the annular grouping of the overlapping ridges. This effect, in its extreme development, results in the gradual loss of the annular form of the cirque, and transition into systems of parallel trains of septa enclosing a graben. The graben-craters and grabens in which crater form has been lost form chains; and the similarity of profile, elevation, and 'color characteristics of the ridges leaves no doubt that here we see a complete gradation from graben-crater into linear septa trains.

MC CALL FIG. 17. Longonot, K e n y a . Scalloped facets are seen in a partly-preserved outer caldera wall. (4) Median adventive craters (Fig. 14). (5) Progressive nesting of calderas (Fig. 15). (6) Minor crater alignments strung out across caldera floors parallel to grid lineaments (Fig. 16). (7) Scalloped facets (Fig. 17). (8) Marginal step-faulting (Figs. 9, 10, 16). (9) Fissure-aligned craterlet chains on outer slopes, outside calderas (Figs. 9, 15). (10) Rectilinear sections of caldera walls following regional lineament trends (Fig.

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