Fenomark

A Fenomark

A Feno Marker is a type of survey marker, developed by the French company Faynot, which is quick to install and well anchored . 15 instances occur in the OSGB36 list . A listing is available from T:UK

T:UK	Station name	Order	Computed	Block
TP7808	Cattlelaith Lane	13	1987	SE44
TP7808	Cattlelaith Lane	13	1989	SE44
TP7807	Kings Standard Hill (1987)	13	1987	SE44
TP7793	Spitalgap Lane	13	1987	SE44
TP7793	Spitalgap Lane	13	1989	SE44
TP7451	Gibbet Hill	3	1989	SK73
TP7792	Woodlands	3	1987	SE44
TP7839	New Champany Reservoir	13	1988	SE22
TP7791	Round Green	13	1988	SK39
TP7794	Rother Valley	13	1988	SK58
TP7790	Lizard Lane	13	1989	NZ29
TP7795	Hammersley Lane	30	1988	TQ08
TP7788	Berwick Golf Course	3	1987	NT86
TP7450	Toton Sidings	3	1988	SK73
TP7789	Westlea	13	1989	NZ42

The installation of a Fenomark has been described as follows: "Apart from the obvious yellow, white or whatever colour block at the top, the mark itself is a hollow rod of variable length. Within the rod are three strands of galvanised rod about 5mms in diameter. After the rod is driven onto the ground a tool is driven down the centre of the tube which drives the 3 rods out the bottom. These are designed to twist and provide a corkscrew anchor into the soil. Consequently ... very difficult to extract. The system was originally developed in France for anchors for grape vine wires."

Fenomarks in the UK are not exclusive to the OS. For example, they can be found along the S bank of the Humber estuary, E of the bridge, where they may have been placed by the National Rivers Authority (NRA). Elsewhere, non-OS Fenomarks have been used in road construction.