Stack of Guidicum Cave (North)

NGR:	HZ 20621 73187
WGS84:	59.54408, -1.63708
Length:	20 m
Vert. Range:	Not recorded
Altitude:	0 m
Geology:	Ward Hill Sandstone Formation - sandstone & dolomitic siltstone
Tags:	Cave, SeaCave
Registry:	main

Sea cave at the foot of steep rocky cliffs, possibly the north entrance to a tunnel/natural arch through to a south entrance.

Assumed system of tunnels through Stack of Guidicum. Length based on GIS ~60 m. Reported position of cave / arch. Assumed to be north entrance of tunnel system. [Report 1145]

Notes: The distance between north and south entrances is 62 m according to these NGRs. If the tunnel from the west entrance runs NW-SE, then that tunnel would add a further 36 m.

But there is, so far, no conclusive evidence that any of these tunnels join each other.

Links and Resources:

Shetland, Sheet LXIX (includes: Dunrossness), Survey date: 1878 Publication date: 1881. Shows 'cave' here, but not the north or west entrances. Current OS 1 in has north and south entrances, but not the west one. No cave tunnels and no 'natural arch'.
Map 14 of Report 1145 shows this cave marked as NS25(N). p178 of FI Caves (GSG version) an annexe of Report 1145.
Pastmap Aerial shows this entrance marked NS25 (N).
Rpt 1145 Harries, D.B., Purcell, A., Moore, C.G., Lyndon A.R., Porter, J.S., Saunders, G.R. and Hume, C.L. 2024. Distribution mapping and baseline monitoring survey of sea caves around Fair Isle. NatureScot Research Report 1145.

This entry was last updated: 2026-01-23 16:11:23

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