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