Map based index (GeoIndex) geological memoirs

This layer of the map based index (GeoIndex) shows areas covered by explanatory sheet Memoirs, along with basic information such as memoir title and publication date. The memoirs themselves,compiled by BGS geologists, date from the late 1890s to present day and provide a comprehensive and detailed account of all aspects of the geology of the areas covered by the 1:50,000 (and 1:63,360) map series. Some memoirs may cover more than one geological sheet area and a few cover key geological themes (eg Jurassic rocks) across a large region. Sheet Descriptions are fully colour-illustrated, shortened accounts of the geology that are available for some of the newer published geological sheets.

本图层所展示的是基于地图索引（地理索引）的覆盖区域，其中包括说明性概要 Memoirs 的覆盖区域，以及诸如概要标题和出版日期等基本信息。这些概要由英国地质调查局（BGS）的地质学家编纂，时间跨度从1890年代晚期至当代，全面且详尽地描述了涵盖1:50,000（及1:63,360）比例尺地图系列区域的所有地质方面。部分概要可能涉及多个地质图幅区域，而少数概要则覆盖了较大区域内关键地质主题（例如侏罗纪岩石）。图幅描述为全彩插图简述，是针对一些新出版地质图幅的可获得资料。