GEOLOGY

Detailed explanation-1: -Graded bedding is shown in this example where pebbles form the lower part of the bed and are replaced by sand and pebbles towards the top, (King George IV Lake area, central Newfoundland). Cross-bedding is stratification inclined to the original horizontal surface upon which the sediment accumulated.

Detailed explanation-2: -In sedimentary rock: Types. Graded bedding simply identifies strata that grade upward from coarse-textured clastic sediment at their base to finer-textured materials at the top (Figure 3). The stratification may be sharply marked so that one layer is set off visibly from those above and beneath it.

Detailed explanation-3: -Structures that are produced at the same time as the sedimentary rock in which they occur are called primary sedimentary structures. Examples include bedding or stratification, graded bedding, and cross-bedding.

Detailed explanation-4: -Limestone, sandstone and coal are examples of sedimentary rocks.