History and dynamics of glaciation in the northern Yellowstone National Park area

Abstract

Measurements made during field work for this report were in U.S. Customary units. With the exception of altitudes, all values have either been converted or remeasured, and are reported in metric (SI) units, rounded off to express the appropriate degree of accuracy. Where the measurement is of altitude, the altitude in feet is also given in parentheses following the value in SI units, because the base-map contours are in feet. Thus if I refer to glacial striations at an altitude of 2,750 m (9,000 ft) on Specimen Ridge, the altitude in feet is given so the reader can readily locate the feature on the map (pi. I A] using the base-map contours. The contours on the reconstructed ice surface (pi. 1A) are in U.S. Customary units because they are derived directly from the topographic base maps. This allows the reader to readily determine the control for the icesurface contours, as well as their accuracy, by examining them in conjunction with the altitudes shown on the base map.