The famous Colorado River is a good example. It flows from "younger" strata into "older" in its deep cutting across the Arizona plateau.[32] Stated in terms of the current theory, this means that when the region of country about the lower part of this river's course first became dry land, the upper part was still sea, and that thus there was no such river in existence here until the very "youngest" of these rocks was formed. For otherwise the river must have started running from the sea toward the dry land, i.e., running up hill. Stated in terms neutral as to theory, it means that the whole of this region of country, drained by this large river, with its rocks of many varying "ages," was all elevated practically as it is now before this river began its work of erosion. It treats all these rocks as if they were of the same age, and as if it began sawing at them all at the same time. Also its companion, the Green River, cuts through the Uinta Range in the same manner. Similar conditions are said to occur on the Danube, and in the river-courses of the Himalayas, and elsewhere. In the case of the Colorado, Zittel says that: "Powell's explanation of the apparent enigma is that after the river had eroded its channel rocks were uplifted in one portion of its course, but so slow was the rate of uplift that the river was enabled to deepen its channel, either proportionately or more rapidly, so that it was never diverted from its former course." It was by similarly cunning inventions that the early writers on astronomy, alchemy, and medicine evaded the force of accumulated facts which told against their absurd theories. We have now completed our survey of the strictly stratigraphical phases of this question, and have found four very remarkable principles about the rocks, which I wish to summarize here before proceeding further. (1) The "broad fact," as stated by Zittel and Dana, that any kind of rocks whatever, i.e. containing any kinds of fossils, even the "youngest," may rest on the Archaean, and may thus in position, as also in texture and appearance, resemble the very oldest deposits on the globe. (2) That any kind of beds may rest in such perfect conformability on any other so-called "older" beds over vast stretches of country that, "were it not for fossil evidence, one would naturally suppose that a single formation was being dealt with," while "the vast interval of time intervening is unrepresented either by deposition or erosion." The youngest seem to have followed the oldest in quick succession.