Author Topic: Mammals’ Rise Began Before Dinosaurs’ Fall, Study Finds  (Read 822 times)

0 Members and 1 Guest are viewing this topic.

Offline Buster's Uncle

  • Upon the escalator I
  • Ascend
  • *
  • Posts: 47985
  • €1017
  • View Inventory
  • Send /Gift
  • Because there are times when people just need a cute puppy  Soft kitty, warm kitty, little ball of fur  Someone thinks a Winrar is You!  
  • AC2 is my instrument, my heart, as I play my song.
  • Planet tales writer Smilie Artist Custom Faction Modder AC2 Wiki contributor Downloads Contributor
    • View Profile
    • My Custom Factions
    • Awards
Mammals’ Rise Began Before Dinosaurs’ Fall, Study Finds
« on: March 14, 2012, 06:51:40 PM »
Quote
Mammals’ Rise Began Before Dinosaurs’ Fall, Study Finds
By SINDYA N. BHANOO
Published: March 14, 2012


It was long believed that mammals began to diversify and flourish only after dinosaurs died out in the mass extinction at the end of the Cretaceous period, about 66 million years ago.

But a new study in the journal Nature suggests that some mammals diversified well before that.

“The story appears more complex,” said an author of the study, Gregory Wilson, a vertebrate paleontologist at the University of Washington.

Using 3-D imaging and CT scanning, he and his colleagues studied the teeth of multituberculates, a group of rodentlike mammals that lived 165 million years ago to about 35 million years ago, well after dinosaurs went exinct. Some of the teeth were tiny: as small as four-hundredths of an inch across.

The researchers found that over time, the mammals’ teeth evolved to have more patches, or bumps.

“In modern mammals, the greater number of patches you have, the more likely you are to have a diet composed of high-fiber or plant materials,” Dr. Wilson said.

From that, the researchers inferred that the multituberculates diversified at least 20 million years before dinosaurs disappeared.

“They were able to expand their range pretty dramatically, and the teeth complexity implies they ate plants,” Dr. Wilson said.

The multituberculates started out the size of mice, he added, but “by the time they started to get more complex teeth, they started to increase in body size such that they were up to the size of porcupines and beavers.”
http://www.nytimes.com/2012/03/20/science/mammals-rise-began-before-dinosaurs-fall-study-finds.html?_r=1&ref=science#

 

* User

Welcome, Guest. Please login or register.
Did you miss your activation email?


Login with username, password and session length

Select language:

* Community poll

SMAC v.4 SMAX v.2 (or previous versions)
-=-
23 (7%)
XP Compatibility patch
-=-
9 (3%)
Gog version for Windows
-=-
92 (30%)
Scient (unofficial) patch
-=-
39 (13%)
Kyrub's latest patch
-=-
14 (4%)
Yitzi's latest patch
-=-
87 (29%)
AC for Mac
-=-
2 (0%)
AC for Linux
-=-
6 (2%)
Gog version for Mac
-=-
10 (3%)
No patch
-=-
15 (5%)
Total Members Voted: 297
AC2 Wiki Logo
-click pic for wik-

* Random quote

Each individual pipe contains a hot slurry of minerals drawn from Planet's crust and makes a sound like rain falling on a tin roof. When they converge on the trunkline the sound is a terrifying thunder, a thunder of untold wealth, and power.
~Captain Ulrik Svensgaard 'Tending the Sea'

* Select your theme

*