The Oligocene forms a band stretching from Antwerp to Maastricht, and this is followed towards the north by a discontinuous strip of Miocene and a fairly extensive area of Pliocene.
De Vries, have urged that as species are discontinuous - that is to say, marked off by structural differences of considerable magnitude - it is more probable that they have arisen from similarly discontinuous variations.
Triassic rocks form a discontinuous band along the northern coast, and are especially well developed in the neighbourhood of Palermo.
The discovery of this significant looped arrangement of the morainic belts is the greatest advance in interpretation of glacial phenomena since the first suggestion of a glacial period; it is also the strongest proof that the ice here concerned was a continuous sheet of creeping land ice, and not a discontinuous series of floating icebergs, as had been supposed.
Apart then from absorption there will be a discontinuous change in brightness in the apparent disk at that value of the angular radius d which corresponds to tangential emission from the upper lever r' of this mirage-forming region.
This was based on the assumption that the medium in which the light is propagated is discontinuous and molecular in character, the molecules being subject to a mutual attraction.
In the simplest case the main girders are supported at the ends only, and if there are several spans they are discontinuous or independent.
As it is unlikely that these delicate insects could be transported across seachannels, their wide and discontinuous range suggests both their great antiquity and the former existence of continental tracts over which they may have travelled to their present stations.
The peculiar action of electric sparks and waves in reducing the resistance of discontinuous conductors was rediscovered and investigated by Calzecchi Onesti,' by Branly, 2 Dawson Turner, 3 Minchin, Lodge, 4 and many others.
Remarkable cases of discontinuous distribution are Chalarodon and Hoplodon in Madagascar, and Brachylophus fasciatus in the Fiji Islands.