fossil_digger Report This Comment Date: February 05, 2006 04:20AM
do you know what the k-t boundry is?
i hope i had something to do with your interest....:~}
Anonymous Report This Comment Date: February 05, 2006 05:20AM
fd: if you hadn't responded I would have been dissapointed. Your Are The Expert
in this Field!!at least on this site, as far as I know..
shaDEz Report This Comment Date: February 05, 2006 05:27AM
uhhh i think it sepperates the age of the reptiles and the age of the mammals
Anonymous Report This Comment Date: February 05, 2006 06:43AM
manatees and sloths
Anonymous Report This Comment Date: February 05, 2006 01:08PM
Manatees taste like chicken
fossil_digger Report This Comment Date: February 05, 2006 11:36PM
you guys could search it up faster than i could explain it, because there are
several interpretations as to its real significance.
Anonymous Report This Comment Date: February 05, 2006 11:42PM
SHADEZ AND TIW...
rogue_1 Report This Comment Date: February 06, 2006 04:10AM
so all this goes to show
WHAT
alterego Report This Comment Date: February 06, 2006 04:37AM
Yeah who's gonna explain the KT boundary? Is it the repltile v mammal thingy?
What does it all mean!?!
John_Stone Report This Comment Date: February 06, 2006 05:59AM
I prefer to dwell on the "K-Y boundary"... something my girlfriend
and I like to explore as often as possible.
fossil_digger Report This Comment Date: February 06, 2006 03:51PM
j_s i thought you said you were married.
oh never mind...:~)
it's not the reptile thingy, but close
fossil_digger Report This Comment Date: February 06, 2006 04:12PM
john you posted this, so i would be interested to hear your hypothesis.
John_Stone Report This Comment Date: February 12, 2006 07:18AM
The K-T boundary separates the age of the reptiles and the age of the mammals,
which was first recognized over one hundred years ago by geologists who realized
that there was a dramatic change in the types of fossils deposited on either
side of this boundary.
This boundary also separates two of the three eras of the Phanerozoic (see time
scale at left), which is the time in earth history that began with the origin
of complex life and extends to the present. These two eras are called the
Mesozoic and Cenozoic. Dinosaurs were prevalent during the Mesozoic Era and
extinct during the Cenozoic Era. The last segment of the Mesozoic Era, from 135
to 65 millions of years ago, is called the Cretaceous Period. The first segment
of the Cenozoic Era, from 65 million years ago until the present, is called the
Tertiary Period. The abbreviation for the boundary between the Cretaceous and
Tertiary periods is the K-T boundary, where K is the abbreviation for the German
form of the word Cretaceous.
This boundary corresponds to one of the greatest mass extinctions in Earth's
history. At least 75 percent of the species on our planet, both in the seas
and on the continents, were extinguished forever. The most famous of the
vanquished are the dinosaurs. However, these giants were only a small fraction
of the plants and animals that disappeared. In the oceans, more than 90 percent
of the plankton was extinguished, which inevitably led to the collapse of the
oceanic food chain.
Rocks deposited during the Cretaceous Period and Tertiary Period are separated
by a thin clay layer that is visible at several sites around the world. A team
of scientists led by Luis Alvarez (a Nobel Prize-winning physicist) and his son
Walter (a geologist) discovered that the clay layer contains a strikingly high
concentration of iridium, an element that is much more common in meteorites than
in Earth's crustal rocks. Like meteorites, asteroids and comets also have
relatively large abundances of iridium. Consequently, they proposed that an
impacting asteroid or comet hit the Earth, generating the iridium anomaly, and
causing the mass extinction event. The discovery of high iridium concentrations
in the clay layer at several places around the world suggested the impact was a
large one.
Google: cretaceous cenozoic K-T boundary
=sheesh=
fossil_digger Report This Comment Date: February 13, 2006 05:07PM
comet/meteor is my theory. pretty obvious i think.
John_Stone Report This Comment Date: February 15, 2006 06:29AM
What do you think about the idea that a huge comet/meteor struck the earth,
made the whole thing ring like a bell for a few years, causing all sorts of
volcanic activity worldwide for those years, only exacerbating the initial
atmospheric dust-load?
fossil_digger Report This Comment Date: February 19, 2006 02:16PM
and earthquakes and glacial melts and tornadoes etc. etc. etc......yes
definitely
there is physical evidence being found of major impacts in the oceans around the
globe. but the technology used to discover them is still in infancy. the info
compilation is being formed to hypothesize a connection to accumulated
evidence
but i think not too many people on this site are interested. so i have never
spent much time preaching my theories