Architectural elements from Lower Proterozoic braid-delta and high-energy tidal flat deposits in the Magaliesberg Formation, Transvaal Supergroup, South Africa

Lagoon–tidal flat sedimentation in an epeiric sea: Proterozoic Bhander Group, Son Valley, India

“…This suggests a palaeogeography comprising coeval lagoon and peritidal¯at systems (Figure 19). The occurrence of¯uvio-aeolian sandsheet deposits (upper Shikaoda Formation) at the top of the succession (Figure 3) suggests that¯uvial and aeolian sedimentation processes might have been operative in the areas landward of the peritidal at ( Figure 19; see also Eriksson et al 1995). The vertical stacking of the formations, i.e.…”

“…De®ciency of mud in pre-Devonian shoreline deposits, in spite of its adequate availability (Runkel et al 1998), has been attributed to augmented aeolian activity on the unvegetated landscape and the action of marine currents sweeping away the ®ner sediment particles from the continental and coastal plain domains to the offshore environment (Long 1978;Dalrymple et al 1985;Aspler et al 1994). A few recent studies, however, have demonstrated that removal of muddy sediments may not have been that effective in some pre-Devonian basins, as re¯ected in the occurrence of muddy intervals in the succession of continental and nearshore strata (Eriksson et al 1995).…”

Stratigraphy, facies architecture, and palaeoenvironment of Neoproterozoic volcanics and volcaniclastic deposits in Fatira area, Central Eastern Desert, Egypt

“…This facies association is similar to stacked deposits of sand-rich low sinuosity channel-fill, with only small-scale bar development, probably under flood conditions (Miall, 1996). The occurrence of cross-lamination sandstone at the base with horizontally laminated units suggests variable energy conditions, with transition from lower flow regime dune bedforms to upper flow regime plane bed conditions (Eriksson et al, 1995).…”

Depósitos flúvio-costeiros da formação raizama, Ediacarano-Cambriano da faixa Paraguai norte, região de nobres, Mato Grosso, Brasil

“…Entretanto, de acordo com Fedo e Cooper (1990), a ausência de tais feições estaria relacionada a ausência de vegetação no período Pré-Cambriano, a qual não permitiu a estabilização das margens de canais (Miall, 1981). A maturidade textural, a granulometria geralmente grossa associada a ausência de depósitos de inundação, abundante carga de fundo, paleocorrentes unidirecionais predominantemente migrando para SE (Eriksson, 1978;Eriksson et al, 1995), e a proximidade com as fácies das associações AF2, AF3 e AF4 são consistentes com depósitos fluviais entrelaçados distais.…”