Smithsonian miscellaneous collections . Fig. SILT BLUFFS AT THE PALISADES. SHOWING BLOCKS OF FROZEN SILTSAS THEY ARE UNDERMINED AND SUBSIDE INTO THE RIVER EXPLORATION IN ALASKA IN I9O/ GILMORL l9 among the debris of driftwood and other vegetable material accumu-lated at their mouths many disassociated bones were recovered (see( + )> fig- 2)- The concentrating action of the water in carryingaway the fine silt and leaving the heavier objects behind wouldaccount for thejr abundance here. In drifting down along the base of the cliffs in the canoe, the skullof an Ovibos sp. nov. (No
Smithsonian miscellaneous collections . Fig. SILT BLUFFS AT THE PALISADES. SHOWING BLOCKS OF FROZEN SILTSAS THEY ARE UNDERMINED AND SUBSIDE INTO THE RIVER EXPLORATION IN ALASKA IN I9O/ GILMORL l9 among the debris of driftwood and other vegetable material accumu-lated at their mouths many disassociated bones were recovered (see( + )> fig- 2)- The concentrating action of the water in carryingaway the fine silt and leaving the heavier objects behind wouldaccount for thejr abundance here. In drifting down along the base of the cliffs in the canoe, the skullof an Ovibos sp. nov. (No. 5728, U. S. National Museum) wasfound on a narrow shelf just above the point (3 on map, see fig. 2)where the underlying gravels first appear. That the skull came. ., mm rosst Fig. 2.—Sketch Map in Vicinity of Palisades. 1. Where section was taken, shown in Fig. 3; 2. Bison bones (Fig. 5); 3. Musk ox skull, No. 5728, U. S. National Museum. down from the cliff above there can be no doubt, for it lay on a pileof talus accumulated since the last high stage of water. The high-water marks were still plainly evident on either side and above theheaps of detritus. Moreover, the cranial and other cavities of theskull were filled with the fine silt composing the bluff. This skullwas in fairly good condition, having, beside two of the molars, someof the bones of the anterior part of the face in a good state of preser-vation. The worn and abraded appearance of most of the fossilshere indicates that they are drift and not in a place of primaryentombment. 20 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 51 Maddren1 makes the observation, There is a little ice on top ofthese bluffs, but nothing like the extensive development exposed inthe Old Crow Basin. Ice wa
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