Field Notebook: CO 1951a
Page 35
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Transcription
2.0 Fine to med grained ss, thinbed, x12m. Beds to .5', silty prngs at top. 2.6 Sandstone, Med.gr. massive x12m., locally friable [Dip & Strike on base - N.15°W, 60° W overturned] sandstone sugary grains well rounded, frays white weathering grains -? - concern on bedding surfaces - looks like beach sand - Ed says. Massive x 12m. bed. Plant fry casts on top below surface. 1.8 Grey clayey shale, 2ft siltstone with plant frags at base. 5.2 Sandstone, Fine grained, white in beds 1/2 to 2.0 thick, but thinner with siltstone lower sh lamination at top, Guelder to overlying sh. Weathering yellow-gray to light buff. 1.0 Interbed. dk shale with light siltstone, with 1/2 bed siltstone in middle part 2.4 Sandstone, fine grained massive, obscurely x 12m. Scolithus-like worm borings in upper .5' Bottom surface has blobs of Fe. 2.2 Interbedded (loose) Dk gray silt shale with light gray fine sandstone. Locally 2 sandstone beds highly varrable in thickness, 5.0 Sandstone, Fine grained, [illegible] cross laminated in beds 1/4 to 2.0, weather buff to Fe brown gray (inter-weathering) 3.3 In upper 1/3 platy to shaley Siltstone, lower 2/3 dk gray shale, fissile weather. 34.0 Fine to medium grained locally soft friable ss. chiefly beds .5 to 2.0 thick cross laminated. Bedding surfaces ripple marked. Ripples current type indicating EtoW movement, x12m with 15