As early as 1908, Breuil[(34)] discovered in the interior of the cave back of the grotto some quartzites worked into Acheulean types, proving that the cavern was entered in Acheulean times. Obermaier,[(35)] in the course of three years' work, has found that the floor of the grotto was possibly used as a flint-making station in Acheulean and, possibly, in Chellean times. The culture section which he has revealed here under the direction of the Institut de Paléontologie humaine can be compared only with that which Commont has found on the 'terraces' of the Somme at St. Acheul. The difference is that in the shelter of the Castillo grotto the climate is recorded only through the changing forms of animal life which are mingled around the fire-hearths and with the flints in the ascending levels.
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Fig. 79. Stratigraphic section showing the archæologic layers of the great grotto of Castillo. After Obermaier.
(13) Eneolithic Age. Small, triangular dagger in copper.
(12) Azilian. Flint industry—Age of the Stag.
(11) Upper Magdalenian. Artistic engravings on stag-horn.
(10) Lower Magdalenian. Flints and fine engravings on bone. Reindeer bâton.
(9) Archaic Solutrean. Feuilles de laurier, retouched on one side only.
(8, 7, 6) Upper Aurignacian in three layers. Remains of the reindeer and burins.