By Frederick I. Ordway

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The more complicated departures from the ideal, which produce craters with straight sections to their walls, seem to be due to adoption of regional linear trends by the annular fault. An additional complication is the lateral sector graben, which also takes up regional linear trends and produces linear faults continuous with and curving into the ring fault. Regional trends are fully integrated in some caldera structures [66], and in some cases arcuate and linear fractures are continuous. An extensive linear fracture traversing the country surrounding the caldera can run into the caldera and deflect into the caldera wall, or produce a straight section of the same.

The large central volcanos rising from the floor are apparently the surface reflections of a series of bosses or cupolas upon a continuous subjacent pluton. In some cases, such as the Miocene Kisingiri volcano [71], the actual plutonic rocks of the cupola or boss have been laid bare by denudation. The fault patterns of the central section have become progressively more closely spaced in each successive episode, and faulting and renewed eruptivity have recurred in progressively more restricted zones.

The case against random superimposition may be argued on the basis of the following three points: (1) Minor craterlets frequently overlap large ones, but the reverse relationship is rarely seen on the lunar surface. While Fielder [57] has lately listed some examples of the reversed relationship, this short list seems a mere drop in the ocean viewed in the light of estimates of 30,000 craters on the Earthward-turned lunar surface. The fact that a search for such cases is needed at all seems to establish the general case that smaller craters tend, as a general rule, to be later than larger ones in their immediate vicinity, and their walls cut into the walls of larger ones but seldom of smaller ones.

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