"Geological time scale". Digital Atlas of Ancient Life. Paleontological Research Institution. 20 Temmuz 2018 tarihinde kaynağından arşivlendi. Erişim tarihi: 17 Ocak 2022.
Bartoli, G; Sarnthein, M; Weinelt, M; Erlenkeuser, H; Garbe-Schönberg, D; Lea, D.W (2005). "Final closure of Panama and the onset of northern hemisphere glaciation". Earth and Planetary Science Letters. 237 (1–2): 33-44. Bibcode:2005E&PSL.237...33B. doi:10.1016/j.epsl.2005.06.020.
Medlin, L. K.; Kooistra, W. H. C. F.; Gersonde, R.; Sims, P. A.; Wellbrock, U. (1997). "Is the origin of the diatoms related to the end-Permiyen mass extinction?". Nova Hedwigia. 65 (1–4): 1-11. doi:10.1127/nova.hedwigia/65/1997/1. hdl:10013/epic.12689.
Bowring, Samuel A.; Williams, Ian S. (1999). "Priscoan (4.00–4.03 Ga) orthogneisses from northwestern Canada". Contributions to Mineralogy and Petrology. 134 (1): 3. Bibcode:1999CoMP..134....3B. doi:10.1007/s004100050465.
Medlin, L. K.; Kooistra, W. H. C. F.; Gersonde, R.; Sims, P. A.; Wellbrock, U. (1997). "Is the origin of the diatoms related to the end-Permiyen mass extinction?". Nova Hedwigia. 65 (1–4): 1-11. doi:10.1127/nova.hedwigia/65/1997/1. hdl:10013/epic.12689.
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Bartoli, G; Sarnthein, M; Weinelt, M; Erlenkeuser, H; Garbe-Schönberg, D; Lea, D.W (2005). "Final closure of Panama and the onset of northern hemisphere glaciation". Earth and Planetary Science Letters. 237 (1–2): 33-44. Bibcode:2005E&PSL.237...33B. doi:10.1016/j.epsl.2005.06.020.
Bowring, Samuel A.; Williams, Ian S. (1999). "Priscoan (4.00–4.03 Ga) orthogneisses from northwestern Canada". Contributions to Mineralogy and Petrology. 134 (1): 3. Bibcode:1999CoMP..134....3B. doi:10.1007/s004100050465.
"Geological time scale". Digital Atlas of Ancient Life. Paleontological Research Institution. 20 Temmuz 2018 tarihinde kaynağından arşivlendi. Erişim tarihi: 17 Ocak 2022.