Baltic beach, bornholm. Danmak ugn=a38o3°0=9
Baltic beach，Bornholm, Danmak Bad sorting and multicompositions gravels
Glendonites from the Permian Wandrawandian Siltstone, Warden head, Sydney Basin Autogenous minei Ikaite(CaC036120 Glendonites that form in water with a temperature below 2C
Glendonites from the Permian Wandrawandian Siltstone,Warden Head, Sydney Basin Ikaite (CaCO36H2O) Autogenous mineral Glendonites that form in water with a temperature below 2C
感 Oolitic limestone (滇西 Permian)
Oolitic limestone （滇西, Permian）
Bedding- plane structures Ripple marks( formed by current, wave and wind) Erosional structures: flute. toolmarks Exposed structures: mud-crack, raindrop impressions(rainpits) salt-pseudocrystal, footprints
Bedding-plane structures Ripple marks（formed by current, wave and wind） Erosional structures:flute, toolmarks Exposed structures：mud-crack, raindrop impressions (rainpits) , salt-pseudocrystal, footprints
(a) Vertical profiles SYMMETRIC Ripple marks ASYMMETRIC (1) Peaked crest i lee side stoss side Basic terms Trough, crest, crestline Stoss side缓 height (h H/2 (in) Rounded crest Lee side陡 crest tre (b) Plan shapes (crestline patterns hachured on steeper (lee) side) straight crested Sinuous crested with bifurcation 4乙 Figure 6.4 (a) Current nipple marks torm in response to flow in one direction as in a stream channel. the enlargement of one ripple shows its internal structure Note that individual layers within the ripple are inclined, showing an example of small-scale cross-bedding. (b)Current ripples that formed in a small stream channel flow was from right to left. (c) The to-and-fro currents of waves in shallow water deform the surface of the sand layer into wave-formed ripple marks. (d) Wave-formed ripple marks in shallow seawater
Ripple marks Basic terms Trough, crest, Stoss side-缓 Lee side-陡