Here you will find a great example of convict-built stone work, part of the Great North Road. Historically, the Great North Road is of state significance as the first made road north of the Hawkesbury. It was constructed by convict gangs between 1826 and 1836.
Park on the isolated loop road separate to the main road, the cache is a magnetic micro approx 10m from the parking area.
From environment.nsw.gov.au:
"Stone culvert at Fernances Crossing:
A curved stone retaining wall with a central rectangular culvert was constructed to carry the road formation across a small east facing gully. The retaining wall to the embankment is 3m high at the highest point. It is battered at a slope of 1:7. The stone blocks are laid random with broken courses, some snecking and an uneven arrangement of perpends. The stones have rough, uneven margins. Course heights range from 20 to 75cm with blocks up to 100cm in length and 80cm in depth. The lintel at the outlet is carved into a semi-circle, which extends for only half the depth of an otherwise typical rectangular slab lintel. This detailing is decorative, not functional. The inlet end of the culvert has been modified by placement of a modern concrete drop-inlet/gully pit. Apart from the wall and culvert, the Fernances Crossing precinct includes some other interesting elements. These include evidence of older quarrying in the rock cutting south of the wall and also near the modern gully pit inlet as well as some sections of older crushed sandstone road pavement visible in the area above the wall."