Advances in space science and technology. Volume 8 - download pdf or read online

By Frederick I. Ordway

ISBN-10: 1483199665

ISBN-13: 9781483199665

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Extra resources for Advances in space science and technology. Volume 8

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MC CALL to the principal regional tectonic lineament (Fig. 13). Cruciform and oblique arrangements are also evident in the sector graben patterns of both lunar and terrestrial craters (Figs. 9, 12). These nicks are difficult to separate from what Spurr [17] called "beaks of subsidence" (Fig. 6 ) . Though Fielder [68] notes that some such beaks have a positive topographic reflection, this is easily explained by recourse to the idea of late eruption concentrated within the area of the "beak of subsidence"; it is doubtful that any very complex argument is required to explain these beaks.

Neither they nor the small superimposed craters can be impact scars; the convention adopted by the cartographers of the United States Geological Survey [62] is quite untenable in the light of detailed analysis of lunar crater patterns. Turning first to the crater Ptolemeus, which is ideally placed for telescopic study ( [ 6 1 ] , p. 60), let us attempt to dissect it into the elements which make up the 90-mi diameter cirque. This crater is of special interest since it has been treated by Urey [14] in a statement of the impact hypothesis—and because, of all lunar craters, this one presents a most convincing case for volcano-tectonic origin.

Once again we can deduce that crater-wall ridges and the septa of the linear systems, crater-wall clefts (a rare occurrence) and clefts on the linear systems (an uncommon occurrence) reflect related processes. Here we have an annular fracture up which, by chance as in the case of linear clefts, no emission occurred to erect a ridge. This structure must present difficulties to the advocate of impact hypotheses. In terms of the hypothesis presented here it is quite easily explained. F. Concentric Ridges Some large lunar craters, such as another of the most interesting lunar cirques, Petavius, have multiple girdling ridges.

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

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