The (Atrocious) Luck Of The Dinosaurs
Had the asteroid that brought their reign to an end struck at "a more convenient time" they could well have survived the cataclysm, according to new research.
Join the discussion below, or Read more at Forbes.com.
“Geologist [I'm Climate Change]”
Since: Mar 07
#1 Jul 30, 2014
Actually the dinos had far worse luck than the article suggested.
A look @ palaeo tsunamis in the Caribbean (going around the central American pacific rim) indicates that there was not just one but 3 impacts.
The 1st impact "Gorgona" hit the edge of a basalt plateau that was then subducted under Colombia leaving isla Gorgona as a rim remnant smashed to fragments and scraped off. This one in the end Maastrichtian several Ma before chixculub led to a glassy tektite fall on NE mexico which was mistaken for chixculub ejecta but was exclusively basaltic glass. This event being oceanic raied out the dust led to a phase of global cooling & lowered the sea level by dint of blasting a chunk of it out into space. It was then FOLLOWED by stage 1 of the deccan trap basalts (relatively low volume). Result:
asteroid 0 dinos 1.
Chicxulub then hit at the K-T boundary after the eruption of the stage 1 deccan traps. This one hit a carbonate platform over a continental fragment in very shallow water. being little water this asteroid smaller than Gorgona left a dust pall that blacked out everything for at least 6 months resulting in collapse of the plant based ecosystem & peredators (dinos included) on land & the bulk of the surface pelagic marine food chain (ocean) leaving only deep marine detritivores & spore formation deep water algal food chains (able to come back after a hiatus in shady conditions), and land based shade tolerant plants & coppice/sucker forming species + seed germination in response to light to re form the land plant ecosystem & detritiovores & detritivore predators to repopulate the land. The Chixculub event was then followed by the high volume stage 2 deccan traps. result asteroid 1 dinos 0.
This was not the end of the story.
In the Danian a 3rd asteroid came down on a continent smaller than chixculub producing another dust pall & once again making a dent in the burgeoning large mammals that were evolving to fill the gap left by the dinos. That event led to a large tsunami on the Brazil carbonate coastline of the Danian. The impact was then followed by the 3rd stage of the Deccan traps. result: asteroid 1 mammals 1 (score draw) the mammals repopulated from small detritivores after the impact, but it definitely crimped Danian biodiversity.
The dinos survived Gorgons & would have survived the continental danian impact with smaller insectivores & hunters surviving, but could not survive the Chicxulub impact which was ~2* the size of the Danian impact, and was also continental.
Have a nice day: Ag
Since: Oct 12
#2 Jul 31, 2014
Interesting article... nice post.
So refreshing on such a desolate forum.
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