Non-random distribution of many terrestrial so-called impact structures and its implication

Tektites probably wholly terrestrial and related to continental movement

“…The line is itself closely paralleled locally by NNVV'ly faults in the narrow transitional zone. That the crater has a significant position on a still larger scale I have attempted to show elsewhere (Crawford, 1978). The balance of evidence leads me to the conclusion that the Bosumtwi crater is almost certainly volcanic, as Rohleder (1936) and Junner (1937) maintained.…”

“…This the more so as we have good evidence of craters of a great range of ages. I have tried to show (Crawford, 1978) that a substantial proportion of the total number of possible impact craters on Earth are not randomly distributed. Many are related in their distribution to carbonatites and other quite certainly purely terrestrial features, and some to major and fundamental tectonic axes.…”

“…That admirably serves the purpose for which it was conceived, but is inappropriate for a continent, one part of which may be rising when another is falling. I suggested (Crawford, 1978) the term 'tribulation' from the Latin tribulum, a threshing sledge. Anyone who has seen one of these usually planked and often ancient wooden structures in use in rural mountainous Turkey or the Balkans, in which it is dragged around by a tethered horse while children dance and jump about on it, will appreciate the significance of the term.…”

“…I suggest also, more speculatively, that these explosions are the most extreme expression, and the rarest in time and place, of a range of volcanic activity (in the broadest sense of the term) which is one result of the combined movement of continents both 'horizontally' and vertically (epeirogenically). The combined movement I term tribulation (Crawford, 1978).…”