Talk:Oligocene
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en: Oligoceen? Is that right? Isn't EN English? --Dante Alighieri 21:39 Dec 5, 2002 (UTC)
[edit] AMK152's Geotimeboxes
AMK152 proposed in edits of 27 December 2006 a geotimebox for this article as follows:
| Eon: | Proterozoic • Phanerozoic • [[]] |
| Era: | Mesozoic • Cenozoic • [[]] |
| Period: | Cretaceous • Paleogene • Neogene |
| Epoch: | Eocene • Oligocene • Miocene |
I feel that the box information that is appropriate for the article is already in the footer, and that other extraneous information, such as previous eons, can be supplied where important, by links from the text. I removed the geotimebox and left the footer, pending discussion. --Bejnar 02:08, 28 December 2006 (UTC)
The Oligocene Epoch is known for expansion of grasslands and restriction of tropical (broad leaf) to equatorial belt. On en.wikipedia.org/wiki/Geologic_temperature_record, the Oligocene Epoch temperature is a clearly defined notch in the general temperature decline across the Paleogene Period. The well-defined notch may indicate an extra-terrestrial causal. P.C.Frisch "Solar Journey: The significance of our Galactic Environment for the Heliosphere and Earth" indicates glaciating (cooling) is a result of interstellar material (ISM) Heliosphere shielding penetration and/or thinning effects. Also, from 3C321 (NASA), a Black Hole Quasar emits relativistic ISM particles in a narrow beam at about distances equal to our Sol Galactic core distance. The Oligocene is the Neotectonic cycle of a 220million year planetary equidistant rupture (PER) geologic cycle (Kvet, 1991), extending to 4650Ma (Million years ago). The Oligocene biosphere, stressed by temperature and perhaps loss of Heliosphere shielding, is an epoch of few new species; Greek ὀλίγος (oligos, few) and καινός (kainos, new). Morbas (talk) 04:04, 20 May 2008 (UTC)
I would like to insert this paragraph in the article replacing/amending the unsuported impact hypothesis. —Preceding unsigned comment added by Morbas (talk • contribs) 10:32, 19 May 2008 (UTC)
- Googling "Heliosphere shielding" finds one use of this phrase on the Internet. The Solar Journey webpage might also be looked at, if others are as dubious as I am. --Wetman (talk) 05:08, 21 May 2008 (UTC)
The book has better detail. You will find it very rich in analysis of the impact of ISM density and velocity on the Heliosphere. The Quasar particle emission is near light speed, many times the velocity of interstellar dust. The Oligocene drop in temperature I thought, was very modest. This a more viable solution than the impact of C4 photo synthesis replacing the Eocene C3 flora type. The continued decline of global temperatures after Oligocene appears set backwards some 10My before continuing, as witnessed by the temperature recoil. As a note, the 220My interval hits PTr boundary and Mid Ordovician Llanvirn Epoch before leaving (backwards in time)the entire Phanerozoic Eon.Morbas (talk) 02:01, 22 May 2008 (UTC)
I have dubious issue with impact effects, the atmosphere is cleared in very very short geological order. A 12M-year Oligocene temperature notch is far to long and stable a cold period for this. The Chesapeake is a small crater at 42Km, and the Siberian is possibly a more substantial 100Km diameter. A 100Km crater has 0.156 the energy of the Yucatan KT crater at 170Km diameter (relative E=R^3.5). The Siberian event was 5/32th the KT event. User:Morbas|Morbas]] (talk) 14:22, 26 May 2008 (UTC)
