Iva valley and its environs are made up of sedimentary rocks, which have structures of features either before or after deposition. During my mapping structures such as bedding planes, burrows, ripple marks and joints were classified under the follow types of structures.
These are structures formed during or shortly after deposition. Eg. Bedding planes and burrows.
This is highly visible in almost all the outcrop visited. They are horizontal surface separating two layers of rock.
These are sedimentary structure which are formed after deposition and it is and evidence that lifer has existed there. For example in location 4 which is the Ajali Sandstone located along Enugu Onitsha express road has clear structure of a burrow.
And location 1 still on Enugu Onitsha express road which is the Mamu formation. The sandstone found there has a clear structure of a burrow.
These structures are formed after sediment deposition and are as a result of tectonic force and activities.
A joint is a tectonic structure which does not aid displacement or movement in rock. A clear structure of a joint was found along Enugu Onitsha express road.
This is another tectonic structure which are produce as a result of current flow from high to low medium. These structure was seen in many location for example location 2,3 and 5.