Preliminary Isostatic Residual Gravity Map of the Tremonton 30' x 60' Quadrangle, Box Elder & Cache Counties, Utah, and Franklin & Oneida Counties, Idaho (MP 14-2) Colorado River History and Sunnyside are presented as

and Sunnyside are presented as the principal areas containing most of the tar-sand resource

measure distances in feet

and to Mesa Arch―the most photographed arch in Canyonlands―in the Island in the Sky District

and the Kantishna Mining District

Preliminary Isostatic Residual Gravity Map of the Tremonton 30' x 60' Quadrangle, Box Elder & Cache Counties, Utah, and Franklin & Oneida Counties, Idaho (MP 14-2) Colorado River History and Sunnyside are presented asBy: V. E. Langenheim, R. Q. Oaks, H. Willis, A. I. Hiscock, B. A. Chuchel, J. Rosario, and C. L. Hardwick A new isostatic residual gravity map of the Tremonton 30' x 60' quadrangle of Utah is based on compilation of preexisting data and new data collected by the Utah and U. S. Geological Surveys. Pronounced gravity lows occur over North Bay, northwest of Brigham City, and Malad and Blue Creek Valleys, indicating significant thickness of low density