What geological feature is located at grid reference 540895 on the map, and what is the reason for this identification?

The easting is 540, which is along the grid line labeled '54'. The northing is 895, which is halfway between grid lines '89' and '90'. This point is within the fold structure where the 'p' (plunge) symbol is located.

At grid reference 540895, the rock units 'l' (limestone) and 's' (shale) are exposed in the center of the fold. According to the legend, limestone and shale are older than the surrounding 'q' (quartzite) and sandstone.

The fold has the oldest rock units (limestone and shale) in its core, and the beds dip away from the central axis (implied by the overall pattern of the fold and the dip symbols elsewhere on the fold limbs). The 'p' symbol with an arrow indicates that the fold axis plunges towards the east. A fold with older rocks in the core and beds dipping outwards is an anticline. Since the axis is plunging, it is a plunging anticline.

The feature located at grid reference 540895 is a:

• Plunging Anticline
• Reason: The oldest rock units (limestone and shale) are exposed in the core of the fold, and the fold axis plunges to the east.