Linked from

The 19 pages that link to Ordovician, each with the reason it gives.

• PaleozoicBroader topic: Its expanding marine biodiversity preceded the era’s first mass extinction.

• SilurianRelated: Its end marks the start of the Silurian.

• CambrianCompared with: The Ordovician begins where the Cambrian ends and continues marine diversification.

• TrilobiteRelated: Trilobite fossils help identify and compare Ordovician marine deposits.

• OstracodermRelated: Ostracoderm-like vertebrates appear in the fossil record during this period.

• Jawless fishRelated: Some of the earliest evidence for vertebrates comes from Ordovician fossils.

• BalticaRelated: Baltica’s changing latitude and seas are reconstructed from rocks deposited during this period.

• EmbryophyteRelated: Evidence for early land-plant spores appears in rocks from this period.

• EurypteridRelated: The earliest known eurypterids appear in Ordovician rocks.

• GlomeromycotaRelated: Evidence of ancient plant–fungus associations reaches back to this period.

• PteraspidomorphiNarrower topic: Some early pteraspidomorphs, including arandaspids, are known from Ordovician rocks.

• BryozoaBroader topic: Bryozoans became prominent and diverse in marine ecosystems during the Ordovician.

• NautiloidBroader topic: Some of the earliest known nautiloids appear in Ordovician rocks.

• Hirnantian glaciationNarrower topic: The Hirnantian glaciation occurred near the end of this period.

• ArandaspisNarrower topic: Arandaspis lived during this period, when vertebrates diversified in the seas.

• KinnekulleRelated: Much of Kinnekulle’s fossil-bearing limestone dates from this period.

• Late Ordovician mass extinctionNarrower topic: The extinction ended this period and its exceptionally rich marine ecosystems.

• LingulataRelated: Lingulates diversified during this period alongside other marine invertebrates.

• Percé RockRelated: Some of the region’s sedimentary rocks originated during this period.