ocr: (Modified from Teiford and others (1976, p.. 24-25) and Mabcy (1976, p.55) values: arei in grams per cubic cenumeer) Rock Unit Average density used Density for contrasts modeling Quaternary basalt 1.98 0.67 Tertiary basalt 2.95 0.30 Granite 2.65 0 Unditlerentiated pre- 2.65 J Tertiary rocks Basalt & intercalated 1.98 -0.67 sedimentary rocks Consolidated 2.45 0.20 sedimentary rocks Unconsolidated 2.20 0.45 sedimentary rocks Upper unit, silicic 2.43 0.22 volcanic rocks Lower unit, silicic 2.53 0.12 volcanic rocks Assumption of Density values for rock types underlying the Snake River Plain is a c ...
