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EMMDNS, LAKES PAPERS <br />silver, and blende,16 which constitutes the milling ore of <br />the district, in the breccias. <br />Supergene enrichment, pp. 315-316. <br />S. F. EMMONS, PRELIMINARY 2'IOTES ON ASPEN, COLORADO, 2 COLORADO SCIENTIFIC SOCIETY <br />PROCEEDINGS 251-277 (1886) . <br />The Emmons paper is one of the first scientific articles on <br />the Aspen district mineral deposits. While some of his <br />assumptions, and therefore conclusions, are archaic, for <br />such a short visit (one week) at such an early stage, his <br />observations were remarkably perceptive, particularly <br />concerning the structural complexity of Aspen mountain and <br />the combination of sedimentary and structural (faulting) <br />control of ore deposition. Emmons discusses resemblances <br />and differences between Aspen and Leadville not annotated <br />here because of more modern interpretations. <br />Emmons noted the apparent absence of the "blue limestone" <br />(the Castle Butte Member of the Leadville Limestone) on <br />Smuggler mountain, p. 271. <br />A. LAKES, GEOLOGY OF THE ASPEN MINING REGION, PITKIN COUNTY, COLORADO, COLORADO <br />SCHOOL OP MINES BIENNIAL REPORT 45-84 (1886) . <br />Lakes' article is an early description of the general <br />geology of the Aspen district, with emphasis on Aspen <br />mountain, where most development to that time had occurred. <br />Diorite "porphyrv" occurs as an interbedded sheet on <br />Smuggler "Hill," p. 63. <br />Comparison between Aspen mountain and Smuggler "Hill." The <br />same [sedimentary] series [as described on Aspen mountain] <br />occurs on Smuggler "Hill." As on Aspen mountain, the dip <br />increases from 40° at the surface to 80° at a depth of 400 <br />16 Sphalerite, zinc sulfide. <br />Bruce A. Collins - 10 - BIBLiocRAPHY <br />