The (Atrocious) Luck Of The Dinosaurs

The (Atrocious) Luck Of The Dinosaurs

There are 2 comments on the story from Jul 28, 2014, titled The (Atrocious) Luck Of The Dinosaurs. In it, reports that:

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.

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“Geologist [I'm Climate Change]”

Since: Mar 07

formerly Nuneaton

#1 Jul 30, 2014
Nice article.

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

Cheshire UK

#2 Jul 31, 2014
Interesting article... nice post.

So refreshing on such a desolate forum.

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