C. BEDDING PLANE MARKINGS:
1. SCOUR MARKS:
When beds separate readily along bedding planes, the surfaces produced
commonly display various markings and structures.
2.Pits And Prints:
⦿Rain, hail, and spray
impressions are small
circular to ellipsoidal
pits formed in wet mud
⦿These marks indicate
environment or on
shore environment of
D. DEFORMED STRUCTURES :
Gravitational displacements may occur during
sedimentation or shortly there after, which deform or
alter the depositional structure.
It means a laminated structure composed of particulate sand, silt
and clay sized sediments, which has been formed by the trapping
and binding of detritus sedimentary particles by an algal mat.
The measurement of palaeocurrents is a vital part of
the study of sedimentary rocks in that they provide
information on palaeogeography, palaeoslopes,
current and wind directions and they are useful in
Of the sedimentary structures commonly seen in
the field, cross-stratification and sole marks have
proven to be the most reliable. With planar cross-
bedding, the palaeocurrent direction is simply the
direction of maximum angle of dip.
For trough cross-bedding, the palaeocurrent
direction is parallel to the trough axis.