Creationism/Evolution
See other Creationism/Evolution Articles
Title: Discovery Pushes Back the Clock on Human Hand Evolution
Source:
popular-archaeology.com
URL Source: http://popular-archaeology.com/issu ... -clock-on-human-hand-evolution
Published: Dec 16, 2013
Author: Matthew Tocheri, National Museum of Natu
Post Date: 2013-12-16 21:43:13 by buck
Keywords: None
Views: 7768
Comments: 15
Any hominin fossil find would be considered a rarity when compared to the abundance of finds from other ancient animals. But this fossil was rarer still, for two reasons. First, it was a type of bone (the third metacarpal in the hand) that, along with other distinct anatomical features, allowed humans, in contrast to other primates, the ability to make tools and perform other manipulative functions that are unique to humans. Second, it was dated to about 1.42 million years ago. It constitutes the earliest evidence of a modern human-like hand, indicating that this anatomical feature existed more than half a million years earlier than previously known. Researchers suspect the bone belonged to the early human species, Homo erectus, a human species that existed between 1.8 million and 143,000 years ago. It is considered the first human species to go global --- geographically, Home erectus fossil remains have been found in East Africa, Georgia, India, Sri Lanka, China and Java. The bone was found near sites where the earliest Acheulian tools have appeared. Acheulian tools are ancient, shaped stone tools that include stone hand axes more than 1.6 million years old. They are most often associated with the presence of Homo erectus. "What makes this bone so distinct," says Carol Ward, professor of pathology and anatomical sciences at the University of Missouri-Columbia and lead author of the study, "is the presence of a styloid process, or projection of bone, at the end that connects to the wrist. Until now, this styloid process has been found only in us, Neandertals and other archaic humans" whose remains have been dated to much later times. humanhandstyloid The styloid process is a projection of bone. Ward and her team found a styloid process at the end of a hand/wrist bone more than 1.42 million years old, indicating this anatomical feature existed more than half a million years earlier than previously known. By explanation, above, Australopithecus is an early hominin that is generally thought to be ancestral to, and predates, the Homo genus, which contains the earliest species of the human line. Credit: University of Missouri In 2011, a team led by Fredrick Manthi from the West Turkana Paleontology Project of the National Museums of Kenya discovered a well-preserved hominin (early human ancestor) hand bone from the site of Kaitio, located in northern Kenya west of Lake Turkana.
Post Comment Private Reply Ignore Thread
Top • Page Up • Full Thread • Page Down • Bottom/Latest
Begin Trace Mode for Comment # 7.
#1. To: All (#0)
Oh my! The age is a wee bit more than 4,000 years old based on Stone's Sunday school teacher's interpretation of the Bible.
841.5 million years (potassium-argon) 1,060 million years (rubidium-strontium) 1,250 million years (uranium-lead) 1,379 million years (samarium-neodymium) Buck puts his faith in Radiometric dating. A flawed process. Because we don't know how things behaved in the past. If rates of decay change over time or accellerate or decelerate. So it can never be science. It is not testable or verifiable. It is just wild guesses in the dark. So many problems with radiometric datine. Here is one example. There are often systematic differences in the radioisotope age estimates provided by the four main radioactive dating methods from the same samples of rock units. Unstable parent atoms decay into daughter atoms of different elements, so measuring quantities of parent and daughter atoms in rocks and minerals, and knowing the rates at which this decay occurs, enables the calculation of when the decay process began in that rock or mineral, which is then deemed its age estimate. An example of the results obtained is provided by the rock layer of volcanic origin at Bass Rapids in the Grand Canyon, which yielded the following age estimates: 841.5 million years (potassium-argon) 1,060 million years (rubidium-strontium) 1,250 million years (uranium-lead) 1,379 million years (samarium-neodymium) These four methods should have yielded the same age estimate for this volcanic rock layer because the decay of each of the four parent atoms all began at the same time when this volcanic rock layer formed. One way these different age estimates can be reconciled is if the different parent atoms decayed at different faster rates in the past. The parent atoms which give the older ages decayed much more, and thus much faster, relative to the other parent atoms
Correct. One would have to observe how this came about.
#9. To: redleghunter (#7)
Where did you get the cartoon with Buck in it?
nice try but no cigar
Top • Page Up • Full Thread • Page Down • Bottom/Latest1.42 million years old
#4. To: buck, nolu chan (#1)
There are often systematic differences in the radioisotope age estimates provided by the four main radioactive dating methods from the same samples of rock units. Unstable parent atoms decay into daughter atoms of different elements, so measuring quantities of parent and daughter atoms in rocks and minerals, and knowing the rates at which this decay occurs, enables the calculation of when the decay process began in that rock or mineral, which is then deemed its age estimate. An example of the results obtained is provided by the rock layer of volcanic origin at Bass Rapids in the Grand Canyon, which yielded the following age estimates:
#7. To: A K A Stone (#4)
These four methods should have yielded the same age estimate for this volcanic rock layer because the decay of each of the four parent atoms all began at the same time when this volcanic rock layer formed. One way these different age estimates can be reconciled is if the different parent atoms decayed at different faster rates in the past. The parent atoms which give the older ages decayed much more, and thus much faster, relative to the other parent atoms
Replies to Comment # 7.
#11. To: redleghunter (#7)
cartoon lunacy brought to you by redleghunter
End Trace Mode for Comment # 7.
[Home] [Headlines] [Latest Articles] [Latest Comments] [Post] [Mail] [Sign-in] [Setup] [Help] [Register]