Planar Laminated Sandstone

Spacing to height ratios of the undulation are generally 100 or more.

Planar laminated sandstone.

The sandstone is planar laminated and in some places ripples can be seen. C d wrinkly laminations interbedded with isolated planar. In geology lamination is a small scale sequence of fine layers laminae. However structures from several millimetres to many centimetres.

Lamina that occurs in sedimentary rocks laminae are normally smaller and less pronounced than bedding lamination is often regarded as planar structures one centimetre or less in thickness whereas bedding layers are greater than one centimetre. The original depositional layering is tilted such tilting not being the result of post depositional deformation cross beds or sets are the groups of inclined. B detail of wrinkled horizontal laminae. Laminated light yellow to yellow colored parallel laminated sl sandstone in the middle and plannar cross stratified grayish white sandstone sp at the top chandimura section on lalmai hills.

Hence planar lamination has also been called horizontal lamination even lamination and parallel lamination. Consisting of several thin layers of. Micaceous particles would fall more slowly owing to their shape thus aggregating on bedding. Covered with a thin layer of plastic to protect it.

Planar laminated sandstones popularly known. The sedimentary structures which result are roughly horizontal units composed of inclined layers. Typically the undulation shows no evidence of lateral accretion but only vertical aggradation and as a result most beds consist of a single laminaset. A laminated sandstone layer with tabular form interbedded with the cross stratified sandstone element ae1.

The term parallel lamination has also been used to describe laminae with parallel but nonplanar boundaries figure p11. Sandstone beds are characterized by a peculiar planar lamination showing a subtle although perceptible undulation. The planar laminated sandstone represents a dry sand sheet the surface of which would have been covered by granule wind ripples and climbing wind ripples. The depositional environment for this unit was slow settling i e fallout without traction.

In geology cross bedding also known as cross stratification is layering within a stratum and at an angle to the main bedding plane. The origin of planar lamination in sands and sandstones. The horizontally bedded sandstone represents a damp sand sheet the surface of which would have been covered by a microbial mat.