| OCR Text |
Show III LOWER PIEDRA RIVER SECTION (Measured by Archuleta County, Colorado T. 34 No, R. 4 w. Section 6 May, 1950 C. N. Holmes & To E. Mullens) Wanakah formation: Mudstone; grayish-red, scattered shale fragments and medium coarse quartz grains in silty matrix, highly weathered, friable Sandstone; grayish-pink, very fine-grained, three horizontal l' beds with shale partings, .••.• black accessories, limonite o ••••••••• 18.8 111.0 4e6 92.2 stains, medium gray limestone concretions 2 to 3" in dd.amet.er .....•••••••••••..••••• Sandstone; pale yellowish-orange gray, very fine to oooooooo to ••••••••• yellowish medium-grained, sub angular to sub-rounded grains, numerous black accessories, limonite specks, heavy vertical ledge. Siltstone; moderate reddish-brown, scattered very fine rounded quartz grains, matrix of clay binding, rubbly slope to friable weathering Siltstone; pale red, scattered very fine quartz grains, thin veinlets of white calcite (?), fairly heavy possibly barite veinlets, near top of interval it becomes more sandy and ledges up, rubbly weathering 0 Covered 0 • 0 •• 0 e ••• • 0 0 0 • Sandstone; light ••••••••• 0 0 • 0 •• 0 • 0 olive to fine to very 0 0 0 • 0 0 • • 0 0 •• •• 0 •• 0 • 0 • 0 " • 0 • • • • 9 6 87.6 ••.• o 15.0 78.0 • • • • • •.. o.o •.. oo ••••••.•• Cit 0 G 0 0 0 0 0 0 • 0 0 0 0 0 0 •. o. " 28.0 1008 35.0 9.2 5.4 2402 15.0 light grayish-green, 63.0 fine-grained, black accessories, silicions, dense, hard, blocky weathering, limonite ..... 0 0 CiI 0 • 0 • 0 0 0 0 " 0 0 .... 0 .... 0 •• 0 0 " 0 .... Igneous dike intruded in section Sandstone; light olive to light greenish-gray, .. fine to very fine-grained, weathe ring Covered; red slope.o .•....•. 0 0 •••• " 0 0 0 0 0 0 ooo ....••••. 0 oo •••• CiI ••••• silicious, blocky 0 GOO 0 o ••• ooo " 4) ., 0 0 • 0 " Q ••••• o ••• 0 0 0 0 0 ooo 0 0 5.6 906 ••••• o 4.0 4.0 0 •• 0 |
