Radiometric dating is used to tell the age of rocks
Despite 35 years of technological refinement and better under-standing, the underlying assumptions have been strongly challenged... "Throughout the conference emphasis was placed on the fact that laboratories do not measure ages, they measure sample activities. To some thoughtful stratigraphers this amazing discovery presented a dilemma, for if the known stratified rocks have been accumulating throughout this vast span of time the average rate of deposition must have been extremely slow, yet there is very good evidence that individual beds accumulated rapidly.It should be no surprise, then, that fully half of the dates are rejected. The connection between activity and age is made through a set of assumptions. Thus Schuchert...found that if a geologic column were built up by superposing the thickest known part of each of the geologic systems in North America, from Cambrian to the present, the composite record would be about 259,000 feet thick.
To put it another way, 'good' dates are those that agree with the field data. ...these lavas are very young, probably less than 200 years old. Age estimates on a given geological stratum by different radiometric methods are often quite different (sometimes by hundreds of millions of years).It is easy to defeat the purpose of effective communication by too much detail in the graphic.A longer excerpt might be desirable but ineffective.This practical challenge is one of the reasons documentation is provided in the form of a handout, which allows one to check the entire book or article referenced. "Two important assumptions are implicit in this equation: First, that we are dealing with a closed system.If you feel that any of the quotes are used in a "deceptive and misleading" way, please contact the webmaster a formal inquiry will be made of your concerns. Significance Of Issue, Earnst Mayr, Harvard, "The revolution began when it became obvious that the earth was very ancient rather than having been created only 6,000 years ago. of CA, Santa Barbara, "As the sun's first ray's of thermonuclear light blazed across the galaxy 4.5 billion years ago, the primal earth emerged from a spinning, turbulent cloud of gas, dust and planetoids that surrounded the new star. On these figures for the age of the earth rest all of geology and evolution." Scientific American, 8/1989, p.90. Given so much time, the 'impossible' becomes possible, the possible probable, and the probable virtually certain. And second, that no atoms of the daughter were present in the system when it formed. of Western Ont., "In conventional interpretation of K-Ar age data, it is common to discard ages which are substantially too high or too low compared with the rest of the group or with other available data such as the geological time scale. Macdougall, "The fourth assumption presupposes that the concentration of uranium in any specimen has remained constant over the specimen's life.I use most of these quotes as handouts to provide documentation for my lecture series.
They were not intended to stand alone as arguments by themselves.
Basically carbon-14 is one isotope of Carbon that is naturally present in living things, but it unstable.
So it emits a ball of two protons and two-neutrons to become carbon-12, which is a type of radioactive decay.
In the Coal Measures of Nova Scotia, for example, the stumps and trunks of many trees are preserved standing upright as they grew, clearly having been buried before they had time to fall or rot away.
Here sediment certainly accumulated to a depth of many feet within a few years.
RAPID, Derek Ager, Past President British Geologists' Asso. It pretends to tell us the whole truth, when it is only telling us a very small part of it.(p.xvi) Nowhere in the world is the record, or even part of it, complete. It may seem paradoxical, but to me the gaps probably cover most of earth history, not the dirt that happened to accumulate in the moments in between. Obviously sedimentation had to be very rapid to bury a tree in a standing position before it rotted and fell down. Standing trees are known at many levels and in many parts of the world. Shrimp, Fish eating Fish, Three Dimensional Fish, Polystrate Trees, Iridescent Shells, Spiders, Jellyfish, Ichthyosaurs Giving Birth, Dinosaur Heart, Dinosaur Blood Cells, Soft Tissue, Bird Tracks, Ubiquitous Ripple Marks "FRESH" DINOS, "Minerals, however, did not replace soft tissue in the bones excavated from the banks of Alaska's Colville River west of Prudhoe Bay. I wrote back and said, Well, what data would convince you? " Discover Magazine, 4/2006 ERASED, "Certain physical limits seem inescapable.