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- 00b13a7e-4d16-4d89-bc47-2839331545e6 definition "The Hirnantian is the seventh and final internationally recognized stage of the Ordovician Period of the Paleozoic Era. It was of short duration, lasting about 1.4 million years, from 445.2 to 443.8 Ma (million years ago). The early part of the Hirnantian was characterized by cold temperatures, major glaciation, and a severe drop in sea level. In the latter part of the Hirnantian, temperatures rose, the glaciers melted, and sea level returned to the same or to a slightly higher level than it had been prior to the glaciation. Most scientists believe that this climatic oscillation caused the major extinction event that took place during this time. In fact, the Hirnantian (also known as the End Ordovician and the Ordovician-Silurian) mass extinction event represents the second largest such event in geologic history. Approximately 85% of marine (sea-dwelling) species died. Only the End Permian mass extinction was larger. Unlike many smaller extinction events, however, the long-term consequences of the End Ordovician event were relatively small. Following the climatic oscillation, the climate returned to its previous state, and the species that survived soon (within two or three million years) evolved into species very similar to the ones that existed before." @default.
- 00b13a7e-4d16-4d89-bc47-2839331545e6 id "1648504" @default.
- 00b13a7e-4d16-4d89-bc47-2839331545e6 path_id 02f8be65-6bdd-4f4d-9e69-adac5aec33f6 @default.
- 00b13a7e-4d16-4d89-bc47-2839331545e6 path_id 0e098a6e-2123-4566-9069-6a3401775ca3 @default.
- 00b13a7e-4d16-4d89-bc47-2839331545e6 path_id 479caf3a-2744-4cef-b992-745c1ffd3e96 @default.
- 00b13a7e-4d16-4d89-bc47-2839331545e6 path_id a9f88ca9-5d19-45fa-8fbb-3c6ff5f1f190 @default.
- 00b13a7e-4d16-4d89-bc47-2839331545e6 path_id af145656-986a-4969-bb77-6e5b2cff1ede @default.
- 00b13a7e-4d16-4d89-bc47-2839331545e6 path_label "Chronostratigraphic Units" @default.
- 00b13a7e-4d16-4d89-bc47-2839331545e6 path_label "LATE" @default.
- 00b13a7e-4d16-4d89-bc47-2839331545e6 path_label "ORDOVICIAN" @default.
- 00b13a7e-4d16-4d89-bc47-2839331545e6 path_label "PALEOZOIC" @default.
- 00b13a7e-4d16-4d89-bc47-2839331545e6 path_label "PHANEROZOIC" @default.
- 00b13a7e-4d16-4d89-bc47-2839331545e6 prefLabel "HIRNANTIAN" @default.
- 00b13a7e-4d16-4d89-bc47-2839331545e6 reference "International Commission on Stratigraphy (http://www.stratigraphy.org/)" @default.
- 00b13a7e-4d16-4d89-bc47-2839331545e6 tag "Chronostratigraphic Units" @default.