層（英語: Formation）は、岩相層序単元の基本単位である。累層ともいう。
| Property | Value |
|---|---|
| dbo:abstract |
|
| dbo:thumbnail | |
| dbo:wikiPageID |
|
| dbo:wikiPageLength |
|
| dbo:wikiPageRevisionID |
|
| dbo:wikiPageWikiLink | |
| prop-en:wikiPageUsesTemplate | |
| dct:subject | |
| rdfs:comment |
|
| rdfs:label |
|
| prov:wasDerivedFrom | |
| foaf:depiction | |
| foaf:isPrimaryTopicOf | |
| is dbo:wikiPageDisambiguates of | |
| is dbo:wikiPageRedirects of | |
| is dbo:wikiPageWikiLink of |
|
| is owl:sameAs of | |
| is foaf:primaryTopic of |
