GEOLOGIC AND STRATIGRAPHIC MAPPING OF SHEEP ROCK AT JOHN DAY FOSSIL BEDS NATIONAL MONUMENT, OREGON
As a part of a GeoCorps America research project, a geologic map and various cross sectional photo points have been created for Sheep Rock, which is comprised of strata from the Turtle Cove and Kimberly Members of the John Day Formation. The geologic map displays, in detail, 16 subunits of the Turtle Cove Member, which consists primarily of volcaniclastic paleosols, along with multiple air flow and welded ash flow tuffs. The region lies in an extensional zone and contains several normal and vertical faults, which have displaced the stratigraphy to various degrees throughout the area. The map explanation includes field descriptions of the units, which have yet to be formally documented. Geographic Information Systems (ArcGIS) technology will allow for 3-D viewing of the digitized maps and photo points, along with GPS correlation with the data used by the paleontologists at collection sites. These resources will be utilized by the existing park staff, future seasonal employees, and park visitors.