CALAVERAS SKULL. (Front and side view.)
What Whitney says of the history and authenticity of the skull will be found in his paper on “Human remains and works of art of the gravel series,” in Ibid. pp. 258-288. His conclusions are that it shows the existence of man with an extinct fauna and flora, and under geographical and physical conditions differing from the present,—in the Pliocene age certainly. This opinion has obtained the support of Marsh and Le Conte and other eminent geologists. Schmidt (Archiv für Anthropologie) thinks it signifies a pre-glacial man. Winchell (Preadamites, 428) says it is the best authenticated evidence of Pliocene man yet adduced. On the contrary, there are some confident doubters. Dawkins (No. Am. Rev., Oct., 1883) thinks that all but a few American geologists have given up the Pliocene man, and that the chances of later interments, of accidents, of ancient mines, and the presence of skulls of mustang ponies (introduced by the Spaniards) found in the same gravels, throw insuperable doubts. “Neither in the new world nor the old world,” he says, “is there any trace of Pliocene man revealed by modern discovery.” Southall and all the Bible advocates of course deny the bearing of all such evidence. Dawson (Fossil Men, 345) thinks the arguments of Whitney inconclusive. Nadaillac (L’Amérique préhistorique, 40, with a cut, and his Les Premiers Hommes, ii. 435) hesitates to accept the evidence, and enumerates the doubters.[1649]
Footprints have been found in a tufa bed, resting on yellow sand, in the neighborhood of an extinct volcano, Tizcapa, in Nicaragua. One of the prints is shown in the annexed cut, after a representation given by Dr. Brinton in the Amer. Philosoph. Soc. Proc. (xxiv. 1887, p. 437). Above this tufa bed were fourteen distinct strata of deposits before the surface soil was reached. Geologists have placed this yellow sand, bearing shells, from the post-Pliocene to the Eocene. The seventh stratum, going downwards, had remains of the mastodon.[1650]
Some ancient basket work discovered at Petit Anse Island, in Louisiana, has been figured in the Chicago Acad. of Sciences, Transactions (i. part 2). Cf. E. W. Hilgard, in Smithsonian Contributions, no. 248.
Foster rather strikingly likens what we know of the history of the human race to the apex of a pyramid, of which we know neither the height nor extent of base. Our efforts to trace man back to his beginning would be like following down the sides of that pyramid till it reaches a firm base, we know not where. Many geologists believe in a great ice-sheet which at one time had settled upon the northern parts of America, and covered it down to a line that extends across Pennsylvania, Ohio, and westerly in a direction of some variableness. There are some, like Sir William Dawson,[1651] who reject the evidence that persuades others. Prof. Whitney (Climatic Changes, 387) holds that it was a local phenomenon confined in America to the northeastern parts. The advocates look to Dr. James Geikie[1652] as having correlated the proofs of the proposition as well as any, while writers like Howorth[1653] trace the resulting phenomena largely to a flood.
ANCIENT FOOTPRINT FROM NICARAGUA.
How long ago this was, the cautious geologist does not like to say;[1654] nor is he quite ready to aver what it all means.[1655] Perhaps, as some theorize, this prevailing ice showed the long winter brought about by the precession of the equinoxes, as has long been a favorite belief, with the swing of ten thousand years, more or less, from one extreme to the other.[1656]