coal
If the layer is of dead plants, it is a compressed layer known as a coal seam.
This layer of solid rock is called bedrock.
LITHOSPHERE.
Chemical weathering can also be caused by the acids produced by some plants. The simple plant, lichen, is an example. As lichens grown on the surface of rock, an acid is produced that dissolves some of the minerals in the rock. Lichen is often called a "pioneer" plant because it is one of the first plants to grow in a rocky area.
A stratum.
coal
If the layer is of dead plants, it is a compressed layer known as a coal seam.
The bottom layer of a sedimentary rock is called the basal layer. This layer is considered the coarsest in the rock.
It is called an uncomformity.
This layer of solid rock is called bedrock.
Sheeting
Pleistocene rock layer
== == This layer is called bedrock.
The bottom layer of rock in a geologic sequence is usually called the basement layer.
Unconformity= break in sedimentary rock record
== == This layer is called bedrock.
A fold