Abert Rim
Abert Rim was discovered by Captain John C. Fremont on December 20, 1843. He named it in honor of his chief, Colonel J. J. Abert of the U.S. Topographic Engineers.
Abert Rim, some 2500 feet above the valley floor is one of the highest fault scars in the United States. This basalt formation, a basic lava covering much of eastern Oregon, issued from great fissures during the Miocene Period of Geologic history, many millions of years ago. After this extensive lava flooding, the Earth’s crust was fractured at many points and great blocks were tilted. Abert Rim is the western edge of one of these tilted blocks, while Abert Lake (directly to the west of these coordinates) lies on top of another.
To log a find of this Earth Cache, complete the following:
1) Estimate the thickness of the basalt layer at the leading edge of the scar.
2) Estimate the angle of Abert Rim at the leading edge of the scar.
3) On the back of the sign, who wrote their name in the upper right in ’04?