Smithsonian miscellaneous collections . Fig. SANDBAR ON THE NOWITNA RIVER, 180 MILES FROM ITS MOUTH. .—LOOKING UP FOX GULCH, BONANZA CREEK, NEAR DAWSON, CANADA Sluice box in the ctnter, and the muck filling of the gulch not yet sluiced out may beseen in the background on the right EXPLORATION IN ALASKA IN I907—GILMORIC 23 by Mr. Maddren on the Porcupine and Old Crow rivers, from thefact the fossils did not become more abundant on the bars as wewent upstream. On some bars many fossils would be found, whileothers would yield only a single specimen. The varying degrees ofpreserv
Smithsonian miscellaneous collections . Fig. SANDBAR ON THE NOWITNA RIVER, 180 MILES FROM ITS MOUTH. .—LOOKING UP FOX GULCH, BONANZA CREEK, NEAR DAWSON, CANADA Sluice box in the ctnter, and the muck filling of the gulch not yet sluiced out may beseen in the background on the right EXPLORATION IN ALASKA IN I907—GILMORIC 23 by Mr. Maddren on the Porcupine and Old Crow rivers, from thefact the fossils did not become more abundant on the bars as wewent upstream. On some bars many fossils would be found, whileothers would yield only a single specimen. The varying degrees ofpreservation exhibited by the specimens points to the conclusion thatthe source of supply is diverse and not one large deposit. Thewriter is inclined to the opinion that the fossils found on the barshave been washed out of the silt banks along the stream and trans-ported to their present resting places largely by the action of thewater. The finding of abundant remains on the bars of a stream that iscutting elevated silts does not necessarily lead to the conclusion thatall of the specimens found there have come
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Keywords: ., bookauthorsm, bookcentury1800, bookdecade1860, booksubjectscience
