The facts stated in the following article relate to the Front ranges of the Rocky mountains in Montana and adjacent Alberta, between the Great plains and the valley of North Fork of Flathead river. The Front ranges are two—Lewis range, which, rising from the Plains across northern Montana, extends into southern Alberta and ends, and Livingston range, which, lying 8 to 15 miles west of the Lewis, becomes in Alberta the easternmost height of the Rockies. The features of adjacent districts are described so far as they bear on the main subject, the stratigraphy and structure of the Front ranges.
Lewis and Livingston ranges consist of stratified rocks of Algorikian age, as determined on fossils Which were found by Weller in the lowest limestone of the series and identified by Walcott as probably being Beltina danai, the species of crustacean discovered in the Grayson shales of the Belt mountains. . . .