| OCR Text |
Show 127 to that of Miall's (1996) braided stream. Furthermore, the percent ratio of mudrocks to sandstones matches that indicated meandering structures stream (4:1) by in Unit 1 at the North Horn the idealized anastomosed stream profile, although the North Horn has profile than some settings (Kirschbaum and although rarely, lateral accretion in anastomosed fluvial McCabe, 1992; Nadon, 1993). At the North Horn type locality, the fluvial sandstones represent small rivers (Franczyk and Pitman, These bear smaller-scale lateral accretion structures that laterally or vertically persistent as settings (Miall, 1996, figs. 8G-I), channels in anastomosed those that and they are more typical could represent might be interpreted as of are crevasse meandering rivers, but such structures also may be found where slight meandering straight reaches of anastomosed rivers as accretion structures bars of point not meandering proximal systems (Nadon, 1994). Lateral in the North Horn Formation within the (Figure 3.30). Lateral accretion elements occur, 1991). type section better occurs (Smith, 1983). paleoslope may aid the development of anastomosis (Kirschbaum and McCabe, 1992; Nadon, 1994), because such low Low stream avulsion and the formation of broad the North Horn Formation grained rocks, placement type locality gradient Low splay sheets. is indicated by the subject geographic depositional basin (Stanley and Collinson, or consistent with anastomosis, and compatible low paleoslope rapid paleogradient for 1979; Oifley and Ekdale, 1999). A very low paleogradient a to predominance of fine and this is consistent with its inferred central in the eastern North Horn is also is paleoslope is with the |
