It may be taken as certain, that after the one age ceased and the first men appeared, the beds in which their relics occur have been raised violently, and again depressed and subjected to great flushes and floods of water. The caves have been upheaved, and the gravels are found chiefly along the valleys of our present rivers, but at a much higher level, showing that there was both a higher level of the soil itself and a much greater volume of water.
The Straits of Dover were formed during this period.
But none of these changes required a very long time; and if we can trace back the later stone age, which shows remains of pottery and other proofs of greater civilization, to the dawn of the historic period not more than 4000 or 5000 years ago, there is nothing in the nature of the changes which, as we have stated, intervened between the palaeolithic and neolithic periods, that need have occupied more than a thousand or two of years. Upheavals of strata and disruptions may be the work of but a short time, or they may be more gradual. And as to the effect of water, that depends on its volume and velocity; no certain rule can be given. Our own direct experience shows that very great changes may take place in a few hundred years.
"The estuaries," remarks Mr. Pattison,[[49]] "around our south-eastern coast, which have been filled up in historical times, some within the last seven hundred years to a height of thirty feet from their sea-level, by the gradual accumulation of soil, now look like solid earth in no way differing from the far older land adjoining. The harbours out of which our Plantagenet kings sailed are now firm, well-timbered land. The sea-channel through which the Romans sailed on their course to the Thames, at Thanet, is now a puny fresh-water ditch, with banks apparently as old as the hills. In Bede's days, in the ninth century, it was a sea-channel three furlongs wide."
Thus we are in complete uncertainty as to the date of the palaeolithic man, or as to the time necessary to effect the changes in the surface of the earth which intervened between it and the later stone ages. But there is nothing which conflicts with the possibility that the whole may have occurred within some 8,000 years.
For the supposition of Mons. Gabriel Mortillet that man has existed for 230,000 years, there is neither evidence nor probability. His theory is derived from an assumption that the geologic changes alluded to occupied an immense time; and the further assumption (if possible still more unwarranted) that the old race which used the chipped stone tools remained stationary for a very long period, and very gradually improved its tools and ultimately passed into the neolithic stage when the art of pottery became known, however rudely.
But, in point of fact, we are not required by our belief in Scripture to find any date for the origin of man, at least not within any moderate limits (not extending to scores of thousands of years). The Bible was not intended to enable us to construct a complete science of geology or anthropology, and the utmost that can be got out of the text is that a date can be suggested (not proved) for one particular family (that of Adam) by counting up the generations alluded to in Holy Writ before the time of Abraham. But these are manifestly recorded in a brief and epitomized form; nor do all the versions agree. We may well believe that a watchful Providence has taken care of the record of inspiration, but we know it has been done by human and ordinary agency. The Bible is God's gift to his Church, and the Church has been made in all ages the keeper of it. Now in the matter of early dates and numbers, an unanimous version has not been kept. According to the construction adopted in the Septuagint, the creation of Adam would go back 7,517 years, while the Vulgate gives 6,067 years. Dr. Hale's computation makes 7,294 years, and the Ussherian 5,967;[[50]] the Samaritan version is, I believe, further different from either.
As it is, the facts show nothing inconsistent with an approximation to these several periods.
As to any absolute date for the appearance of man as a species, no calculation is possible, because of a certain doubt, which no one can pretend to resolve, as to whether the Scriptures do assert the creation of all mankind at any one period. If, owing to more positive discoveries in the future compelling us to put further back the date of man's first appearance upon earth, we have to suppose a beginning before the time of Adam, we are reminded that there is an allusion in the sixth chapter of the book called Genesis to "the sons of God" and the "daughters of men." Now this passage cannot conceivably refer to angels; nor can we ignore its existence, however doubtful we may feel as to its meaning.[[51]]
It can hardly be denied that such a text opens out the possibility of an earlier race than that of Adam; in that case the creation of Adam would be detailed as the creation of the direct progenitor of Noah, whose three sons still give names (in ethnological language) to the main great races of the earth, with whom exclusively the Bible history is concerned, and especially as the direct progenitor of that race of whom came the Israelites, and in due time the promised seed—the Messiah. I do not say this is so, nor even that I accept the view for my own part; I only allude to the possibility, without ignoring any of the difficulties—none of which, however, are insuperable—which gather round it.