454. GEORGE ROGERS MANSFIELD 
synclinal structure east of the overthrust in the Bloomington-Paris 
district about 4 miles to the north may continue southward beneath 
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Fic. 6 4.—Map of part of the Preuss Range, Lanes Creek quadrangle, showing the Blackfoot fault and associ- 
ated features. 
cover. The dip of the thrust plane as a whole in the St. Charles 
district is probably gentle. A measurement in Paris Canyon 
about 6 miles north shows the dip at that locality to be 23°. 
