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Tabular cross-bedding, or planar bedding consists of cross-bedded units that are extensive horizontally relative to the set thickness and that have essentially planar bounding surfaces. [3] Trough cross-bedding, on the other hand, consists of cross-bedded units in which the bounding surfaces are curved, and hence limited in horizontal extent. [3]
Most of the remaining part of the formation consists of coarse green trough cross-bedded sandstones, the colour coming from its content of epidote and chlorite. The coarse sandstone beds are interbedded with fine-grained sandstones and siltstones, which become more common towards the top of the formation. The siltstones show desiccation features.
The Bay of Stoer Formation consists of a lower section formed of red trough cross-bedded sandstones with some pebbles, interpreted to be the deposits of a braided river system. The uppermost 100 m of the formation, the Stac Fada and Poll a' Mhuilt members, form a distinctive marker layer within the Stoer Group succession with a strike extent of ...
Cross-bedding and scour in a fine sandstone (Logan Formation, Mississippian, Jackson County, Ohio) A teepee structure in modern halite deposits along the western shore of the Dead Sea, Israel. These structures are within sedimentary bedding and can help with the interpretation of depositional environment and paleocurrent directions. They are ...
Cross-bedding – the axis of a trough cross bed or the down-dip direction of a tabular cross bed point the direction of paleo flow. Current ripple marks – will have the short side of the ripple pointing down stream. Sole markings/flute casts – the short, steep side will point up stream, and the long, tapered side points down stream.
Flaser bedding, vertical cross section. If the amount of deposited sand exceeds mud deposits, we get ripples with isolated mud drapes in ripple troughs and crests. This type of sedimentary structure is called flaser bedding. Flaser bedding can be subdivided according to how the mud is deposited over the rippled sand.
The sandstones are predominantly found in the upper sections and exhibit either horizontal bedding, planar, or trough cross-bedding. The sandstones, depending on the bedding type, were deposited in either shoreface, foreshore, infralittoral or estuarine environments. Marine invertebrate fossils and trace fossils are common in this formation. [9]
Stacked successions of trough cross-bedded, medium- to coarse-grained sandstone of the upper part of the Indotrigonia africana Member are interpreted as tidal channel and sand bar deposits. At some places in the surroundings of Tendaguru Hill, these sediments interfinger with oolitic limestone layers that represent high-energy ooid shoals .