. The Crystal Falls iron-bearing district of Michigan. Iron ores; Geology; Geology, Stratigraphic; Geology, Stratigraphic. OKE DEPOSITS OF UPPEK UURONIA>;. 179 CV'luinlnu, Duuu, Miistodou, juid others to the west (PL XVIII), sire prol)- ablv the westeru conthiuatiou of tliis hue of luiiies, and follow the trend of the main synclinal axis of the district. The position of these mines with reference to the main structural features of the district can be seen on the relief map and the sketch map corresponding to it, PI. XIV. The section made through the closely folded Upper Huronian lieds by w
. The Crystal Falls iron-bearing district of Michigan. Iron ores; Geology; Geology, Stratigraphic; Geology, Stratigraphic. OKE DEPOSITS OF UPPEK UURONIA>;. 179 CV'luinlnu, Duuu, Miistodou, juid others to the west (PL XVIII), sire prol)- ablv the westeru conthiuatiou of tliis hue of luiiies, and follow the trend of the main synclinal axis of the district. The position of these mines with reference to the main structural features of the district can be seen on the relief map and the sketch map corresponding to it, PI. XIV. The section made through the closely folded Upper Huronian lieds by w Fill. 12.—Sketcli illustraliiig coiitortioD of Ujiper Huroiiiaii strata. the Paint River affords the best opportunity in the district for studying the rocks, but the rocks are so crumpled that even here the succession was not made out with certainty. The sketch fig. 12, by W. N. Merriam,^ shows the folding of the slate and chert strata as seen in the railroad cut between the Paint River and the Lin- coln mine. The strike of the rocks is about N. 80° E. The sketch is taken looking almost along the strike of the beds. In fig. 13 a sec- ,..-•''" \. ond sketch is given, also hj W. N. Merriam, which illus- trates the rapid change in strike in these beds, due to the con- tortion of the strata. This change is seen near the east end of the wagon bridge just across the Paint River from OrVStal Falls At this nOint ^'^' ^^'—S^^tch showing change of strike of Upper Huronian beds •^ ' i ilue to the folds. the beds bend from a strike ot S. 40° E. to W. 10° S. The change takes place by means of three very sharp bends. The following are the observations made by Rominger upon these expo- sures near Crystal Falls: Among the recently discovered productive fields for irou mining, the vicinity of Crystal Falls has become famous for its wealth in ore. The formation enclosing the ore. ' Manuscript Please note that these images are extracted from scanned page images that may ha
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