Carbon-14 is considered to be a highly reliable dating technique.
Schweitzer answered the challenge by testing with antibodies.
Her report in 2009 confirmed the presence of collagen and other proteins that bacteria do not make.
From 2007 through 2011 the Paleochronology group had 11 dinosaur bone samples carbon dated by the Center for Applied Isotope Studies at the University of Georgia, and for good reason.
Senior research scientist Alexander Cherkinsky specializes in the preparation of samples for Carbon-14 testing.
So we wondered whether the radiocarbon levels relevant to dating organic material might also vary for different areas and whether this might affect archaeological dating." The authors measured a series of carbon-14 ages in southern Jordan tree rings, with established calendar dates between 16 A. They found that contemporary plant material growing in the southern Levant shows an average offset in radiocarbon age of about 19 years compared the current Northern Hemisphere standard calibration curve.
Manning noted that "scholars working on the early Iron Age and Biblical chronology in Jordan and Israel are doing sophisticated projects with radiocarbon age analysis, which argue for very precise findings. But our work indicates that it's arguable their fundamental basis is faulty -- they are using a calibration curve that is not accurate for this region." Applying their results to previously published chronologies, the researchers show how even the relatively small offsets they observe can shift calendar dates by enough to alter ongoing archaeological, historical and paleoclimate debates.However, it has been hard to reach the public with the information. Yet it is found in four-foot long, nine-inch diameter dinosaur femur bones claimed to be greater than 65 million years old.Despite being simple test results without any interpretation, they were blocked from presentation in conference proceedings by the 2009 North American Paleontological Convention, the American Geophysical Union in 20, the Geological Society of America in 20, and by the editors of various scientific journals. Acro Acro Acro Acro Acro Allosaurus Hadrosaur #1 Hadrosaur #1 Triceratops #1 Triceratops #1 Triceratops #1 Triceratops #2 Triceratops #2 Hadrosaur #2Hadrosaur #2 Hadrosaur #2 Hadrosaur #2 Hadrosaur #2 Hadrosaur #3 Apatosaur GX-15155-A/Beta/bio GX-15155-A/AMS/bio AA-5786/AMS/bio-scrapings UGAMS-7509a/AMS/bio UGAMS-7509b/AMS/bow UGAMS-02947/AMS/bio KIA-5523/AMS/bow KIA-5523/AMS/hum GX-32372/AMS/col GX-32647/Beta/bow UGAMS-04973a/AMS/bio UGAMS-03228a/AMS/bio UGAMS-03228b/AMS/col GX-32739/Beta/ext GX-32678/AMS/w UGAMS-01935/AMS/bio UGAMS-01936/AMS/w UGAMS-01937/AMS/col UGAMS-9893/AMS/bio UGAMS-9891/AMS/bio11/10/1989 06/14/1990 10/23/1990 10/27/2010 10/27/2010 05/01/2008 10/01/1998 10/01/1998 08/25/2006 09/12/2006 10/29/2009 08/27/2008 08/27/200801/06/2007 04/04/2007 04/10/2007 04/10/2007 04/10/2007 11/29/2011 11/29/2011(a) Acro (Acrocanthosaurus) is a carnivorous dinosaur excavated in 1984 near Glen Rose TX by C. Detwiler; in 108 MA Cretaceous sandstone - identified by Dr. The "Modified Longin Method" is the normal purification method for bone collagen. Libby, the discoverer of Radiocarbon dating and Nobel Prize winner, showed that purified collagen could not give erroneous ages.Archaeologist Sturt Manning and colleagues have revealed variations in the radiocarbon cycle at certain periods of time, affecting frequently cited standards used in archaeological and historical research relevant to the southern Levant region, which includes Israel, southern Jordan and Egypt.These variations, or offsets, of up to 20 years in the calibration of precise radiocarbon dating could be related to climatic conditions.Carbon-14 (C-14) dating of multiple samples of bone from 8 dinosaurs found in Texas, Alaska, Colorado, and Montana revealed that they are only 22,000 to 39,000 years old.