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Ordovisium Awal

Ordovisium Awal merupakan kala pertama dari periode Ordovisium, yang dimulai pada 485.4 juta tahun lalu, hingga 470 juta tahun lalu[1]. Suhu Bumi pada kala ini perlahan menurun.[2]

Peristiwa

Dimulainya kala ini ditandai dengan Peristiwa kepunahan Kambrium-Ordovisium, yang memusnahkan banyak jenis brakiopoda, konodonta, serta mengurangi populasi trilobit secara drastis. Namun, tingkat keanekaragaman hewan masih terjaga. Pada kala ini, makhluk hidup terdiversifikasi (Peristiwa Biodiversifikasi Ordovisium Besar) hingga tiga kali lipatnya.[3]

Graptolit plankton, sebuah fosil indeks (fosil yang menentukan suatu periode) yang penting, muncul pada periode ini[4]

Referensi

  1. ^ "Geologic TimeScale Foundation - Stratigraphic Information". timescalefoundation.org. Diakses tanggal 2021-12-27. 
  2. ^ Munnecke, Axel; Calner, Mikael; Harper, David A.T.; Servais, Thomas (1 October 2010). "Ordovician and Silurian sea–water chemistry, sea level, and climate: A synopsis". Palaeogeography, Palaeoclimatology, Palaeoecology. 296 (3–4): 389–413. doi:10.1016/j.palaeo.2010.08.001. 
  3. ^ Sepkoski, J. J. (1995). "The Ordovician Radiations: Diversification and Extinction Shown by Global Genus-Level Taxonomic Data". Diakses tanggal 24 November 2012. 
  4. ^ Kesalahan pengutipan: Tag <ref> tidak sah; tidak ditemukan teks untuk ref bernama Cooper 2001

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