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According to the Extinction article, marine fauna began going extinct, at an accelerating rate, from 300-250Ma, culminating in the PT MX. Climatically, Permian period earth was cold, undergoing glacial ice ages. Meanwhile, more advanced Therapsid animals were evolving, and evidently replacing the more primitive fauna. Perhaps the basal Therapsid was warm-blooded ? 66.235.38.214 (talk) 11:17, 22 October 2012 (UTC)[reply]
Biarmosuchia, the most basal Therapsids, lacked the large sail of Dimetrodons. Ipso facto, they had evolved other means of regulating their body temperature, i.e. were warm-blooded ? Separately, the flood-basalt eruptions mentioned above define the boundaries of the late and end Permian; perhaps the mid-Permian threshold derives from something similar ? 66.235.38.214 (talk) 11:35, 22 October 2012 (UTC)[reply]
Massive volcanic emissions of greenhouse gases (CO2 & CH4) warmed world ocean-water, reducing oxygen levels, and allowing H2S producing bacteria to "pollute" the seas. Mass extinctions began in the deep ocean 270Ma, and accelerated 260-250Ma, up through the water column, to increasingly shallower levels. Ipso facto, massive marine volcanism could have occurred c.270Ma, explaining the minor extinction at that time. (The ocean floor thereby hypothetically covered would have long since been subducted, destroying the direct evidence.) 66.235.38.214 (talk) 17:24, 24 October 2012 (UTC)[reply]
I really feel the section entitled "Extinction Patterns" really needs a revamp. The "Plants" and "Sharks" sections both seem to be a general examination of extinction patterns in the Permian, not an examination on the effects of Olson's extinction. The study of Cascales Minana et al. (2015) showed that plants experienced a sudden spike in extinction rate at Olson's extinction. Discussion of extinction events later in the Permian is irrelevant. Same for sharks. There is also more recent work on Olson's extinction out there. I will be making these changes gradually.
— Preceding unsigned comment added by 192.76.8.11 (talk) 14:34, 7 February 2017 (UTC)[reply]
The phrase (under Identification) "the final extinction killed off only about 80% of species alive at that time" reads rather strangely. Maybe the word "only" is to blame. Macdonald-ross (talk) 12:08, 5 December 2021 (UTC)[reply]
