Free Republic
Browse · Search
Bloggers & Personal
Topics · Post Article

To: BroJoeK

****Actually, there was a pre-Cambrian explosion of life, of which there is much evidence in the fossil record, including some ancestors which you claim don’t exist. Indeed the earliest evidences of life are found in rocks dated to billions of years old.****

How come you told me there was a precambrian explosion and then gave me a link to the Cambrian explosion?

I went to Wikipedia (again, Wikipedia), the birthplace of the link you gave me and did a search for “Precambrian Explosion”.

Here’s what I got back:

Search results
From Wikipedia, the free encyclopedia
You searched for Precambrian explosion (all pages starting with “Precambrian explosion” | all pages that link to “Precambrian explosion”)

No article title matches
No page with that title exists.

The good news is you can create the page yourself and put anything in there you want.....which is what makes Wikipedia a BAD SOURCE...anybody can edit it.


1,639 posted on 02/03/2009 9:09:29 PM PST by schaef21
[ Post Reply | Private Reply | To 1620 | View Replies ]


To: schaef21
"How come you told me there was a precambrian explosion and then gave me a link to the Cambrian explosion?"

The "precambrian explosion" occurred before the Cambrian Explosion. My google on the term "precambrian explosion" produced the following links:

Precambrian Explosion

Avalon precambrian Explosion

And speaking of Wikipedia, here's what they say about life on earth before the "Cambrian Explosion":

Wikipedia on Cambrian Explosion

"However, evidence of Precambrian metazoa is gradually accumulating. If the Ediacaran Kimberella was a mollusc-like protostome (one of the two main groups of coelomates),[56][17] the protostome and deuterostome lineages must have split significantly before 550 million years ago (deuterostomes are the other main group of coelomates).[74] Even if it is not a protostome, it is widely accepted as a bilaterian.[74][60] Since fossils of rather modern-looking Cnidarians (jellyfish-like organisms) have been found in the Doushantuo lagerstätte, the Cnidarian and bilaterian lineages must have diverged well over 580 million years ago.[74]

"Trace fossils[54] and predatory borings in Cloudina shells provide further evidence of Ediacaran animals.[64] Some fossils from the Doushantuo formation have been interpreted as embryos and one (Vernanimalcula) as a bilaterian coelomate, although these interpretations are not universally accepted.[45][46][75] Earlier still, predatory pressure has acted on stromatolites and acritarchs since around 1,250 million years ago.[41]

"The presence of Precambrian animals somewhat dampens the "bang" of the explosion: not only was the appearance of animals gradual, but their evolutionary radiation ("diversification") may also not have been as rapid as once thought. Indeed, statistical analysis shows that the Cambrian explosion was no faster than any of the other radiations in animals' history.[4]

I take it you are hung up on the word "explosion," which is obviously a dramatic description. But it turns out the "explosion" during the Cambrian was neither greater, nor less, than during other periods, before or after.

More Wikipedia on Precambrian life

"It is not known when life originated, but carbon in 3.8 billion year old rocks from islands off western Greenland may be of organic origin. Well-preserved bacteria older than 3460 million years have been found in Western Australia. Probable fossils 100 million years older have been found in the same area. There is a fairly solid record of bacterial life throughout the remainder of the Precambrian. "Excepting a few contested reports of much older forms from USA and India, the first complex multicelled life forms seem to have appeared roughly 600 Ma. A quite diverse collection of soft-bodied forms is known from a variety of locations worldwide between 542 and 600 Ma. These are referred to as Ediacaran or Vendian biota. Hard-shelled creatures appeared toward the end of that timespan.

"A very diverse collection of forms appeared around 544 Ma, starting in the latest Precambrian with a poorly understood small shelly fauna and ending in the very early Cambrian with a very diverse, and quite modern Burgess fauna, the rapid radiation of forms called the Cambrian explosion of life."

1,664 posted on 02/06/2009 10:31:28 AM PST by BroJoeK (a little historical perspective...)
[ Post Reply | Private Reply | To 1639 | View Replies ]

Free Republic
Browse · Search
Bloggers & Personal
Topics · Post Article


FreeRepublic, LLC, PO BOX 9771, FRESNO, CA 93794
FreeRepublic.com is powered by software copyright 2000-2008 John Robinson