The BGS Lexicon of Named Rock Units (September 2017)

The Lexicon of Named Rock Units provides definitions of lithostratigraphic, lithodemic, and litho-morpho-genetic geological units of the United Kingdom and its associated continental shelf. The Lexicon focuses mainly on units of Member, Formation, Group and higher rank (and equivalents) but it also includes information on some units of lesser rank, notably economically important coal seams and laterally extensive marine bands. It includes superficial and bedrock units. It includes synonyms and other names not currently recognised by the BGS or regarded as obsolete. Full Lexicon entries include geological unit name, a persistent unique identifier, map code, currency, rank, parent unit and rank, age, lithology, definitions of boundaries, thickness, previous and alternative names, geographical extent, type localities, and bibliographical references. This dataset is a snapshot of the live database taken on the 14th September 2017.《命名岩石单元词典》（Lexicon of Named Rock Units）收录了英国及其毗邻大陆架的岩石地层（lithostratigraphic）、岩石谱系（lithodemic）以及岩石形态成因（litho-morpho-genetic）地质单元的定义。该词典主要聚焦于段（Member）、组（Formation）、群（Group）及更高层级（及等效同级单元）的地质单元，同时也涵盖部分低层级单元，其中尤以具有经济价值的煤层与横向延展广泛的海相层为代表。其内容涵盖表土层单元与基岩单元。该词典同时收录目前未被英国地质调查局（British Geological Survey, BGS）认可或被视为废弃的同义词及其他曾用名称。完整的词典条目包含地质单元名称、持久唯一标识符、图幅代码、有效状态、单元层级、母单元及其层级、形成时代、岩性、边界定义、厚度、曾用名与替代名、地理分布范围、典型产地以及参考文献。本数据集为2017年9月14日快照的实时数据库版本。