Annual report of the Board of Regents of the Smithsonian Institution . sed, the blank spots on the world map of to-daybeing few and comparatively small. The conquest, however, has been largely one of two that it is nearly over, we are left all the more free to focus theattention on a whole series of antecedent worlds. This is whatEurope is at present doing. She is now bent on discovering the pre-historic worlds beneath her very feet. She has found that mansoccupation of the earth has not only length and breadth, but alsodepth, and therefore admits of measurement in three dimensi
Annual report of the Board of Regents of the Smithsonian Institution . sed, the blank spots on the world map of to-daybeing few and comparatively small. The conquest, however, has been largely one of two that it is nearly over, we are left all the more free to focus theattention on a whole series of antecedent worlds. This is whatEurope is at present doing. She is now bent on discovering the pre-historic worlds beneath her very feet. She has found that mansoccupation of the earth has not only length and breadth, but alsodepth, and therefore admits of measurement in three dimensions in-stead of two. Surely here is more work for the pathfinder. Thatsuccess will attend his labors, the discoveries of the past decade offerample proof. This survey of recent progress is made first of all from the stand-point of chronology. In the second place the evidence of mansantiquity has been arranged under three categories, derived respec- 580 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1909. Brick earth. Ergeron. 1^ D. a a ^ eJ -^ fl y. c! ii. Km Eolian deposits.() Gray clay withsuccinea. I-aniinated clay. -a c ?a tA o t^ a a a <u J o C s tj 0) fe o hJ Gray clay. Potters earth. Fluvial sands. Fluvial sands. Flinty layer. Sand and pottersearth. Flinty layer. Cretaceous.
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