The authors, during the last three years, have made a rather careful study of the Carboniferous sediments of east-central Montana, urged on by the possible economic value. Because of the character of the sediments the greater part of the time was spent in a study of the beds to which the name Quadrant has been applied. It is doubtful if the name Quadrant should be applied to central Montana, if it is to reflect similarity of sediments compared with the type locality. However, because no serious attempt has been made to study the Quadrant sufficiently to differentiate one part from...
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