Nor, up to the present time, are the evidences of the existence of man during Miocene and Pliocene times admitted as conclusive. Professor Capellini has discovered, in deposits recognised by Italian geologists as of Pliocene age, cetacean bones, which are marked with incisions such as only a sharp instrument could have produced, and which, in his opinion, must be ascribed to human agency. To this view it is objected that the incisions might have been made by the teeth of fishes, and further evidence is waited for.
Not a few discoveries have been made, apparently extending the existence of man to a much more remote antiquity, that of Miocene times. M. l’Abbé Bourgeois has collected, from undoubted Miocene strata at Thenay, supposed flint implements which he conceives to exhibit evidences of having been fashioned by man, as well as stones showing in some cases traces of the action of fire, and which he supposes to have been used as pot-boilers. M. Carlos Ribeiro has made similar discoveries of worked flints and quartzites in the Pliocene and Miocene of the Tagus; worked flint has been found in the Miocene of Aurillac (Auvergne) by M. Tardy, and a cut rib of Halitherium fossile, a Miocene species, by M. Delaunay at Pouancé.
Very divided opinions are entertained as to the interpretation of the supposed implements discovered by M. l’Abbé Bourgeois. M. Quatrefages, after a period of doubt, has espoused the view of their being of human origin, and of Miocene age. “Since then,” he says, “fresh specimens discovered have removed my last doubts. A small knife or scraper, among others, which shows a fine regular finish, can, in my opinion, only have been shaped by man. Nevertheless, I do not blame those of my colleagues who deny or still doubt. In such a matter there is no very great urgency, and, doubtless, the existence of Miocene man will be proved, as that of Glacial and Pliocene has been, by facts.” Mr. Geikie, from whose work—Prehistoric Europe—I have summarized the above statements, says, in reference to this question: “There is unquestionably much force in what M. Quatrefages says; nevertheless, most geologists will agree with him that the question of man’s Miocene age still remains to be demonstrated by unequivocal evidence. At present, all that we can safely say is, that man was probably living in Europe near the close of the Pliocene period, and that he was certainly an occupant of our continent during glacial and interglacial times.”
Professor Marsh considers that the evidence, as it stands to-day, although not conclusive, “seems to place the first appearance of man [in America] in the Pliocene, and that the best proofs of this are to be found on the Pacific coast.” He adds: “During several visits to that region many facts were brought to my knowledge which render this more than probable. Man, at this time, was a savage, and was doubtless forced by the great volcanic outbreaks to continue his migration. This was at first to the south, since mountain chains were barriers on the east,” and “he doubtless first came across Behring’s Straits.”
I have hitherto assumed a certain acquaintance, upon the part of the general reader, with the terms Eocene, Miocene, and Pliocene, happily invented by Sir Charles Lyell to designate three of the four great divisions of the Tertiary age. These, from their universal acceptation and constant use, have “become familiar in our mouths as household words.” But it will be well, before further elaborating points in the history of these groups, bearing upon our argument, to take into consideration their subdivisions, and the equivalent or contemporary deposits composing them in various countries. This can be most conveniently done by displaying these, in descending order, in a tabular form, which I accordingly annex below. This is the more desirable as there are few departments in geological science which have received more attention than this; or in which greater returns, in the shape of important and interesting discoveries relative to man’s existence, have been made.
Comparatively recent—comparatively, that is to say, with regard to the vast æons that preceded them, but extending back over enormous spaces of time when contrasted with the limited duration of written history,—they embrace the period during which the mainly existing distribution of land and ocean has obtained, and the present forms of life have appeared by evolution from preceding species, or, as some few still maintain, by separate and special creation.
THE TERTIARY OR CAINOZOIC AGE.
| Man’s range, according to l’Abbé Bourgeois, Quatrefages, and others. | Man’s range according to Capellini, Marsh, and others. | Man’s range, generally admitted. | |||
| 1. | Recent | Post Tertiary | |||
| 2. | Post Glacial | ||||
| 3. | Pleistocene or Quaternary (including Glacial formation) | Tertiary or Cainozoic. | |||
| 4. | Newer Pliocene | Pliocene | |||
| 5. | Older Pliocene | ||||
| 6. | Upper Miocene | Miocene | |||
| 7. | Lower Miocene | ||||
| 8. | Upper Eocene | Eocene | |||
| 9. | Middle do. | ||||
| 10. | Lower do. | ||||
PLIOCENE.