Lithologic Logs of Observation Wells and Test Holes Drilled in 1987 in ValleyFill along the North Flank of the Little Rocky Mountains, Fort Belknap Indian Reservation, North-Central Montana

摘要

Observation wells and test holes were drilled in 1987 in valley fill along thenorth flank of the Little Rocky Mountains as part of a water-resources investigation to determine, in part, the geometry (thickness and lateral distribution) of various valley-fill materials. The lithologic logs of the 66 observation wells and 44 test holes presented in this report were prepared as part of that study. Geologic units identified on the lithologic logs range in age from Jurassic to Holocene. The location of each observation well and test hole is shown on a map.