cross-bedding การใช้
ประโยค
- The attitude of the cross-bedding indicates that the current flowed to the west .
- Bimodal cross - bedding
- The dark - gray traction current deposits belong to internal - tide deposits , it develops sandstones and siltsands , and charactered with lenticular , wave , flaser bedding , bimodal cross - bedding and ripple mark
- Furthermore , sorting of the sandstones in the braided river is better compared with that of in the meandering river system . in the same subfacies , grain size is larger and sorting is better in the channel sandstones which developed with large - scale cross - beddings such as trough cross - bedding , compared with sandstones in the flood microfacies . in the same microfacies , better sorting and coarser grained sandstones are distributed in the middle and lower part of the unit
- These internal - tide deposits can be classified into four basic types according to their features , i . e . , bi - directional cross - laminated fine - grained sandstone , unidirectional cross - bedded and bidirectional cross - laminated medium - grained to fine - grained sandstone , rhythmic thin alternating beds of sandstone and mudstone , and oolitic limestone
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