Fusionism

Definition and stakes

Portrait of William Buckland William Buckland,  Geology and Mineralogy considered with reference to Natural Theology (1837)

“ We can only assert, that as the laws that now regulate the movements and properties of all the material elements, can be shown to have undergone no change since matter was first created upon our planet; no forms of organization such as now exist, or such as Geology shows to have existed, during any stages of the gradual formation of the earth, could have supported, for an instant, the state of, fusion here supposed. ”
Source: Wikisource

Justin R. Loomis,  The Elements of Geology; Adapted to the Use of Schools and Colleges

“ We do not know at what depth below the surface of the earth the rocks become liquid; but above the line of actual fusion there must be a mass of rock not melted, yet scarcely retaining the solid form. For a great thickness, perhaps for several miles, it would be in a more or less yielding state. As there is not actual fusion, the stratification is not destroyed, [136] but such a degree of mobility among the particles exists, that some degree of crystallization takes place, and the elastic forces below easily bend, throw into folds, compress, and in every way contort these strata. ”
Source: Gutenberg

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