Did Ancient Humans Coexisted with Dinosaurs?

Did Ancient Humans Coexisted with Dinosaurs?

Everything Worth Knowing About Scientific Dating Methods This dating scene is dead. The good dates are confirmed using at least two different methods, ideally involving multiple independent labs for each method to cross-check results. Sometimes only one method is possible, reducing the confidence researchers have in the results. Methods fall into one of two categories: These methods — some of which are still used today — provide only an approximate spot within a previously established sequence:


In February , scientists announced that a new suite of tests shows Mungo Man died 40, years ago, not 62, years as other scientists had claimed based on different dating tests. Both dates contradict the earliest carbon dating results on the ancient remains. But there is a good reason. It all centres on the discovery of human remains in sand dunes surrounding ancient Lake Mungo—now a dry, flat plain, vegetated by scraggly salt-tolerant bushes and grasses.

Electron spin resonance (ESR) dating of sea shells has been made using the paramagnetic defects produced by natural radiation. The total dose of natural radiation of the materials, termed the archaeological dose, has been determined from ESR signals of defects in .

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Electron paramagnetic resonance

Erythrocyte Sedimentation Rate Definition The erythrocyte sedimentation rate ESR , or sedimentation rate sed rate , is a measure of the settling of red blood cells in a tube of blood during one hour. The rate is an indication of inflammation and increases in many diseases. Purpose ESR is increased in rheumatoid diseases, most infections, and in cancer. An advanced rate doesn’t diagnose a specific disease, but it does indicate that an underlying disease may be present.

A physician can use ESR to monitor a person with an associated disease. The ESR doesn’t always follow the course of cancer.

ESR dating is a unique and important method that can reveal the activity of the fault. By applying ESR dating globally to obtain fault data, it is possible to visualize the active faults map including activity age, activity period, and the frictional heat widespread.

See Article History Fission-track dating, method of age determination that makes use of the damage done by the spontaneous fission of uranium , the most abundant isotope of uranium. The fission process results in the release of several hundred million electron volts of energy and produces a large amount of radiation damage before its energy is fully absorbed. The damage, or fission tracks, can be made visible by the preferential leaching removal of material by solution of the host substance with a suitable chemical reagent; the leaching process allows the etched fission-track pits to be viewed and counted under an ordinary optical microscope.

The amount of uranium present can be determined by irradiation to produce thermal fission of uranium , which produces another population of tracks, these related to the uranium concentration of the mineral. Thus, the ratio of naturally produced, spontaneous fission tracks to neutron-induced fission tracks is a measure of the age of the sample. A wide variety of minerals have been fission-track dated, as have natural and artificial glasses.

Fission-track dating has been used for very old samples e. Learn More in these related Britannica articles:

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Classification and origin For many years, professionals have vigorously debated whether Neanderthals should be classified as Homo neanderthalensis or as Homo sapiens neanderthalensis, the latter placing Neanderthals as a subspecies of Homo sapiens. The original reconstruction of Neanderthal anatomy was flawed and exacerbated the distinction between Neanderthals and humans. Based on a nearly complete skeleton of an elderly male found in France, the reconstruction showed bent knees and a slouching gait Smithsonian b.

This image, which led to a standard and lingering view of crude cavemen, was mistaken, as Neanderthals apparently walked fully upright without a slouch or bent knees.

Dating of interpretation. De paleontologie een belangrijk probleem. Title esr dating methods allow one of gender inequality. Could you please provide details of dating and quartz of prehistoric archaeology: indirect or animal lived.

My first look at Python was an accident, and I didn’t much like what I saw at the time. O’Reilly books occasionally land on my doorstep, selected from among the new releases by some mysterious benefactor inside the organization using a random process I’ve given up trying to understand. One of them was Programming Python. I found this somewhat interesting, as I collect computer languages. I know over two dozen general-purpose languages, write compilers and interpreters for fun, and have designed any number of special-purpose languages and markup formalisms myself.

Interested readers can surf to the SNG home page at http: I have also written implementations of several odd general-purpose languages on my Retrocomputing Museum page, http: So I dived into Programming Python with one question uppermost in my mind: Perl, of course, is the pound gorilla of modern scripting languages. It has largely replaced shell as the scripting language of choice for system administrators, thanks partly to its comprehensive set of UNIX library and system calls, and partly to the huge collection of Perl modules built by a very active Perl community.

Larry Wall, its creator, is rightly considered one of the most important leaders in the Open Source community, and often ranks third behind Linus Torvalds and Richard Stallman in the current pantheon of hacker demigods. At that time, I had used Perl for a number of small projects.

The dating game

Speleothems formed from salt, sulfur and other minerals are also known. Speleothems made of pure calcium carbonate are a translucent white color, but often speleothems are colored by chemicals such as iron oxide , copper or manganese oxide , or may be brown because of mud and silt particulate inclusions. Chemistry[ edit ] Many factors impact the shape and color of speleothem formations including the rate and direction of water seepage, the amount of acid in the water, the temperature and humidity content of a cave, air currents, the above ground climate, the amount of annual rainfall and the density of the plant cover.

Most cave chemistry revolves around calcium carbonate CaCO3 , the primary mineral in limestone and dolomite. It is a slightly soluble mineral whose solubility increases with the introduction of carbon dioxide CO2. It is paradoxical in that its solubility decreases as the temperature increases, unlike the vast majority of dissolved solids.

The challenges of direct dating. ESR measures the natural radiation absorbed by a material since its formation. Before applying this method, the researchers used U-series dating to ensure that the.

Papers ESR dating and the human evolution: Despite many difficulties found for ESR dating of bones and carbonates, tooth enamel dated by ESR has been proven as a reliable method in its application to fossil teeth and quartz. Both of the latter materials have allowed dating of Early and Middle Pleistocene sites which are not datable using other methods such as the Argon—Argon method.

In particular, recent discoveries of human remains in western Europe have been proposed to be sites of the earliest arrival of humans there, and have been dated to the Early Pleistocene by ESR using quartz and tooth enamel. Combined ESR and U-series dating of fossil herbivore teeth are the only means of dating layers from which such ancient remains have been recovered in western Europe.

Good examples are the sites of Atapuerca Gran Dolina, Spain and Visogliano, Italy which have been dated using tooth enamel. When no bones and teeth can be found in prehistoric sites, ESR dating on quartz extracted from sediments has been used to date sites whose ages range over the entire Quaternary period.

We present here two examples that occur in fluvial terraces of the river Creuse, France and at Monte Poggiolo site, Italy, where several artefacts of an archaic pebble industry have been recovered.


Recent investigations focused on Early-to-Middle Pleistocene samples have highlighted the limitations of the standard procedures, as well as the complexity of the post-depositional alteration processes in dental tissues at micro-scale. Basically, the project aims are: Laboratory work has been mostly focused on the understanding of the physical and chemical processes affecting the teeth over time by investigating: The amount of data produced lead to the development of specific data reduction procedures in order to extract useful information from all the analyses performed during the two year.

Dissemination activities over the two years included, among others:

Physical Geology, by Brian J. Skinner and Stephen C. Porter A well written introductory textbook on physical geology with lots of figures. The Solid Earth – An Introduction to Global Geophysics, by C.M.R. Fowler This book has nothing to do with quartz but is about the inner workings of the planet earth, and it clearly addresses expert readers and undergraduate students of geology.

Cave popcorn , or cave coral, are small, knobby clusters of calcite; Cave pearls are the result of water dripping from high above, causing small “seed” crystals to turn over so often that they form into near-perfect spheres of calcium carbonate; Snottites are colonies of predominantly sulfur oxidizing bacteria and have the consistency of “snot”, or mucus; [1] Speleothems may also occur in lava tubes. Although sometimes similar in appearance to speleothems in caves formed by dissolution, these are formed by the cooling of residual lava within the lava tube.

Speleothems formed from salt, sulfur and other minerals are also known. Speleothems made of pure calcium carbonate are a translucent white color, but often speleothems are colored by minerals such as iron , copper or manganese , or may be brown because of mud and silt particulate inclusions. Chemistry Edit Many factors impact the shape and color of speleothem formations including the rate and direction of water seepage, the amount of acid in the water, the temperature and humidity content of a cave, air currents, the above ground climate, the amount of annual rainfall and the density of the plant cover.

Most cave chemistry revolves around calcite ; CaCO3, the primary mineral in limestone. It is a slightly soluble mineral whose solubility increases with the introduction of carbon dioxide , CO2. It is paradoxical in that its solubility decreases as the temperature increases, unlike the vast majority of dissolved solids. This decrease is due to interactions with the carbon dioxide, whose solubility is diminished by elevated temperatures; as the carbon dioxide is released, the calcium carbonate is precipitated.

Most other solution caves that are not composed of limestone or dolostone are composed of gypsum calcium sulfate , the solubility of which is positively correlated with temperature.

Stone Tools in the Fossil Record

Since an electron’s spin magnetic moment is constant approximately the Bohr magneton , then the electron must have gained or lost angular momentum through spin—orbit coupling. Because the mechanisms of spin—orbit coupling are well understood, the magnitude of the change gives information about the nature of the atomic or molecular orbital containing the unpaired electron. The principal axes of this tensor are determined by the local fields, for example, by the local atomic arrangement around the unpaired spin in a solid or in a molecule.

Choosing an appropriate coordinate system say, x,y,z allows one to “diagonalize” this tensor, thereby reducing the maximal number of its components from 9 to 3: Here Bx, By and Bz are the components of the magnetic field vector in the coordinate system x,y,z ; their magnitudes change as the field is rotated, so does the frequency of the resonance.

For a large ensemble of randomly oriented spins, the EPR spectrum consists of three peaks of characteristic shape at frequencies gxxB0, gyyB0 and gzzB0:

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Subsequently Diogenes the Cynic, in an equally flippant fashion, displayed a plucked chicken and declared, “Here is Plato’s man. In his work on biology, he avoided the effort to treat biological entities by the use of rigid formal logic, and, though he made some inevitable errors in fact, his pragmatic approach has served as a model for biological observation ever since. From long before the time of the ancient Greeks, human beings were generally recognized as members of the animal world.

Much later, in the middle of the 19th century, Charles Darwin, in his brilliant book ‘On the Origin of Species by Means of Natural Selection’ , forced the world to face the fact that all the living creatures of the world had almost certainly descended from a common ancestor. He further developed that view in his work ‘The Descent of Man’ , in which he specifically stated that humankind ultimately shared a common origin with the rest of animate nature. At the time when Darwin was writing, there was only the most rudimentary sort of a fossil record to support his view, and he was further hindered by the use of the term man to stand for the human species as a whole.

As that word suggests, there was a tendency to conceive of males as typifying the human condition. Obviously, females are of equal importance to the survival of the human species, and, somewhat belatedly, the field of biological anthropology has come to realize that males and females require equal attention if the phenomenon of humankind and how it emerged from its nonhuman predecessors is ever to be understood.

It came as something of a surprise when scientists determined that human beings share almost 99 percent of their genetic material with chimpanzees. This led one scientific journalist to refer to humans as “the third chimpanzee.

Electron spin resonance dating

Stratigraphic unit numbers are shown on the left, and the cultural horizons are highlighted in gray. Clovis ages have been reported elsewhere see text. No HF etching was applied. An initial equivalent dose De estimate was made by comparing the natural OSL signal of four aliquots to their OSL signal after a given dose.

A second identical regenerative dose was applied to the same four aliquots, and the Infrared Stimulated Luminescence IRSL signal was measured as a check for feldspar contamination. Thermal transfer tests that were carried out to assess the possibility of charge transfer from light-insensitive shallow traps to light-sensitive OSL traps showed no significant thermal transfer

ESR Dating of Barite in Sea-Floor Hydrothermal Sulfide Deposits in the Okinawa Trough 29 Taisei Fujiwara, Shin Toyoda, Ai Uchida, Jun-ichiro Ishibashi.

I am in my junior year at Wichita State University, working on a degree in Biology with an emphasis on the environment and wildlife. I also enjoy visiting with my family, friends and animals. I am most interested in Luminescence Dating because it includes the least destructive method of testing. This type of dating measures charged electrons and can be used for dating samples even farther back than radiocarbon dating.

Luminescence Dating measures the charged atoms that accumulate in the crystalline material. It is used to find the approximate age of an artifact. This method can be used to date archaeological finds back hundreds of thousands of years, even farther back than Radiocarbon Dating. There are three types of Luminescence dating: According to the Archaeology Online Text, each method relies upon an accurate characterization of the annual radiation dose to which the sample was recovered.

Here we report thermolumines-cence dates for 20 specimens of burnt flints recovered from the hominid-bearing layers of Qafzeh1. The dates, which range from 90 to kyr bp, provide an independent measure for the great antiquity of southwest Asian modern humans which have previously been dated to 40 kyr bp on the basis of European models7—9. The minerals in the sample light up while being heated.

This method has been used to date pottery. Archaeologist were able to approximate the amount of time that passed since the last firing of the sample.

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Bosna i Hercegovina From the book “Politics of Genocide” author dr. Herman During the civil wars that accompanied the dismantling of the Federal Republic of Yugoslavia in the s, the United States, Germany, NATO, and the European Union EU all sided with the national groups seeking to break away from the unified federal state, and opposed the national group that held out for the longest time to preserve it, the Serbs; this placed the Western bloc solidly behind the Croats and Slovenes, then the Bosnian Muslims, and finally the Kosovo Albanians.

Because the wars were supported and even carried out by the NATO powers, and there was significant ethnic cleansing and ethnic killings, it goes almost without saying that not only “ethnic cleansing” but also the words “massacre” and “genocide” were quickly applied to Serb operations. The remarkable inflation of claims of Serb evil and violence and playing down of NATO clients’ violence , with fabricated “concentration camps, ” “rape camps,” and similar Nazi- and Auschwitz-like analogies, caused the onetime head of the U.

Popular perceptions pertaining to the Bosnian Muslim government have been forged by a prolific propaganda machine. A strange combination of three major spin doctors, including public relations PR firms in the employ of the Bosniacs, media pundits, and sympathetic elements of the US State Department, have managed to manipulate illusions to further Muslim goals.

The Mousterian is defined by the appearance of a method of stone-knapping or reduction known as the Levallois Technique, named after the type site in the Levallois-Perret suburb of .

Electron spin resonance Wed, 22 Feb Paleoanthropology Electron spin resonance ESR dating is also based on the accumulation of radiation-induced energy in minerals and thus has close links to luminescence dating. Although first attempts to exploit the ESR phenomenon for dating go back to the s Zeller et al. The ESR method permits age determination up to few million years, far beyond the range of the luminescence methods, and covers the whole Quaternary period. The most important material for paleoanthropologic ESR application is tooth enamel, but quartz-separates from sediments at prehistoric sites also have a certain potential Rink With ESR, one dates either the burial, as in the case of fossil teeth, or the resetting of a previous system as a result of bleaching, as in the case of sedimentary quartz grains or heating of stones.

The ESR phenomenon is caused by paramagnetic centers in the crystal lattice. Radiation-induced trapped electrons, mentioned already in the context of luminescence dating, form such centers and give rise to characteristic ESR signals. The intensity of the ESR signal is a function of the number of trapped electrons and, therefore, of the accumulated energy dose AD that has been absorbed from the ionizing radiation in the course of time.

The quantity of AD is determined by ESR spectrometry, which exploits the fact that trapped electrons are unpaired.

ESR Blood Test (in Hindi)

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