Field experiments carried out in the Brigham Sand and Gravel Company pit, near Brigham City, Utah, show an impressive similarity between observed gravelly deltaic foreset facies in highwall exposures and inclined reflections detected by ground-penetrating radar (GPR). Beneath the pit floor, the radar indicates additional inclined strata more than 30 m deep. In a test to compare different antenna frequencies (50, 100, and 200 MHz), using a 400 V transmitter, 50 MHz antennas are capable of detecting gravel facies in excess of 30 m, whereas signal loss for the 100 and 200 MHz antennas occurs below 23 and 17 m, respectively, though providing higher resolution.

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