Snap­shot of ex­tinc­tion: Fos­sils show day of killer as­ter­oid

Sun.Star Pampanga - - SCIENCE! -

of Kansas doc­toral stu­dent, that ap­peared in a New Yorker magazine ar­ti­cle pub­lished Fri­day but not in the scientific pa­per. DePalma did not re­turn an email or phone mes­sage seek­ing com­ment.

For decades, the mas­sive as­ter­oid crash that caused the Chicx­u­lub crater in Mex­ico’s Yu­catan Penin­sula has been con­sid­ered the likely cause of the mass ex­tinc­tion of­ten called the “KT bound­ary” for the di­vi­sion be­tween two ge­o­logic time pe­ri­ods. But some sci­en­tists have in­sisted that mas­sive vol­canic ac­tiv­ity played a role. John­son and Melosh said this helps prove the as­ter­oid crash case.

There were only a few di­nosaur fos­sils from that time, but the foot­steps are most con­vinc­ing, Smit said.

There was more than di­nosaurs, he said. The site in­cludes ant nests, wasp nests, frag­ile pre­served leaves and fish that were caught in the act of dy­ing. He said that soon af­ter fish die they get swollen bel­lies and th­ese fos­sils didn’t show swelling.

The re­searchers said the in­land tsunami points to a mas­sive earth­quake gen­er­ated by the as­ter­oid crash, some­where be­tween a mag­ni­tude 10 and 11. That’s more than 350 times stronger than the 1906 San Fran­cisco earth­quake.

Pur­due’s Melosh said as he read the study, he kept say­ing “wow, wow, what a dis­cov­ery.”

The de­tails com­ing out of this are “mind-blow­ing,” he said.

WFri­day ASHINGTON (AP) — New re­search re­leased cap­tures a fos­silized snap­shot of the day nearly 66 mil­lion years ago when an as­ter­oid smacked Earth, fire rained from the sky and the ground shook far worse than any mod­ern earth­quake.

Newspapers in English

Newspapers from Philippines

© PressReader. All rights reserved.