Sentences with phrase «extinction event recorded»

The quantity and concentration of highly varied limestone formations is extraordinary in a global context, whilst the superbly exposed geology provides an insight into the recovery of marine life in the Triassic period, after the greatest extinction event recorded in the history of life on Earth.

Not exact matches

«If climate were causing this, we would expect to see these extinction events either sometimes (diverging from) human migration across the globe or always lining up with clear climate events in the record,» said Lyons, assistant professor of biology at Nebraska.

Then about 252 million years ago, another anoxic event was associated with the Permo - Triassic extinction, the largest mass extinction on record.

And the events recorded in this suite of sedimentary rock suggest that the common explanation for the extinction of the dinosaurs — a massive asteroid impact — doesn't fully account for their undoing.

«This new temperature record provides a direct link between the volcanism and impact events and the extinction pulses — that link being climate change,» said Sierra Petersen, a postdoctoral researcher in the U-M Department of Earth and Environmental Sciences.

«These two extinction pulses coincide with the two warming spikes we identified in our new temperature record, which each line up with one of the two «causal events.»»

By comparing extinction events with the entire record of mammal turnover over the past 65 million years, the researchers demonstrated that body size and diet did not influence extinction risk for mammals for most of their evolutionary history.

That makes this the fastest extinction event on record, even if it is not yet a mass die - off.

Human evolution is characterised by speciation, extinction and dispersal events that can not currently be explained by global or regional paleoclimate records [1]--[3].

This resulted in a significant extinction event that is well documented in the fossil record and took thousands of years for the earth to recover from.

I was trying to refer to the large extinction event that occurred some 65 million years ago; if you wanted to date the event using the sedimentary record it would be better to look at a widespread, well - preserved fossil type — a marine snail or something — rather then dinosaurs.

The geological record is pretty clear that rapid climatic transitions cause extinction events.

In fact, the world's interconnected ocean as a whole is sliding into the Holocene Mass Extinction, the geological event that some scientists use to divide the boundary of the Holocene and the Anthropocene epoch, the one that's named after us — and that may still be visible in the Earth's geological record hundreds of millions of years from now, because species of fish, shellfish, crustaceans and other marine life, that were abundant on this planet for millions of years — suddenly, in less than the blink of a geologist's eye, vanished — for good.

At the end of the day, runaway climate change may be the result of the greatest failure of political leadership in recorded history... assuming recordkeeping is still maintained within the context of an extinction event.

«An examination of the fossil record indicates that the key junctures in hominin evolution reported nowadays at 2.6, 1.8 and 1 Ma coincide with 400 kyr eccentricity maxima, which suggests that periods with enhanced speciation and extinction events coincided with periods of maximum climate variability on high moisture levels.»

The extinction, and sudden change in climate, seen at the end of the Triassic period, is one of the top three «mass extinction events» seen in the geological record.

Another problem for the hard snowball theory is the lack of a massive extinction event in the Cryogenian fossil record.

With reference to Stephen Schneider's The worst - case scenario, my readings of recent geology research suggests that the actual worst case is a replay of the oceanic anoxic events (nice summary that extends the wiki article) that appear to be associated not only with most mass extinctions in the geologic record, but also with the conditions permitting the deposition of most petroleum source rocks.

JimD, the fossil record is pretty clear on the subject of extinction level events; collisions of the planet with large racks and comets is bad news for the biosphere.