Locations at Funzie on the island of Fetlar, and at Norwick on the island of Unst contain excellent examples of structures relating to the Caledonian age disruption and emplacement of the Shetland Ophiolite Complex. The Caledonian age Shetland Ophiolite Complex contains exceptionally well developed and exposed sections of the lower parts of the characteristic ophiolite sequence, including layered gabbro, cumulates and mantle rock. Composed of two tectonic units (the Lower Nappe and Upper Nappe) each underlain by an imbricate zone, it is among the finest and most accessible examples of ophiolitic rocks in Europe. The sites at Funzie and Norwick have been selected to be part of the Caledonian Structures of Great Britain Geological Conservation Review (GCR) network, as the best examples in Britain of structures relating to Caledonian ophiolite disruption and emplacement. As the Funzie GCR site and the Norwick GCR site they form the Caledonian Structures of Shetland GCR block.

Accounts of all other sites in the Caledonian Structures of Great Britain Geological Conservation Review (GCR) network are already published (Treagus, 1992). Accounts of the Caledonian Structures of Shetland GCR block sites are, therefore, presented in this paper to complete publication of the Caledonian Structures of Great Britain Geological Conservation Review (GCR) network.

在Fetlar岛上的Funzie以及Unst岛上的Norwick的地点，都很好地展示了与加里东时期的扰乱和设得兰蛇绿石复合体的进驻有关的结构。加里东时期的设得兰蛇绿岩复合体包含特有的蛇绿岩层序下部的异常发育和裸露的部分，包括层状辉长岩，堆积物和地幔岩。它由两个构造单元（下推覆带和上推覆带）组成，每个单元都由一个胶合带层覆盖，是欧洲最好的和最容易获得的蛇纹岩岩石实例之一。Funzie和Norwick的地点已被选为大不列颠地质保护评论（GCR）网络的加里东构造的一部分，作为英国有关加里东蛇绿岩破坏和安置的结构的最好例子。作为Funzie GCR站点和Norwick GCR站点，它们形成了设得兰群岛GCR区块的喀里多尼亚结构。

大不列颠地质保护评论（GCR）的喀里多尼亚构造中所有其他地点的账目已经出版（Treagus，1992）。因此，本文介绍了设得兰群岛GCR区块地点的喀里多尼亚结构，以完整出版英国地质保护评论（GCR）网络的喀里多尼亚结构。