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Homo sapiens (ANT)

K–Ar dating

Potassium–argon dating, abbreviated K–Ar dating, is a radiometric dating method used in geochronology and archaeology. It is based on measurement of the product of the radioactive decay of an isotope of potassium (K) into argon (Ar) . Potassium is a common element found in many materials, such as micas, clay. For very young samples (a few hundred thousand years or less), Equation 5 is a good approximation of the precision obtainable from " " Ar/39Ar dating. ADVANTAGES OF THE * * AR/39AR METHOD The 40Ar/39Ar method totally eliminates the wet chemistry side of the K-Ar Method. In the conventional K-Ar technique, the. 9 Mar The 40ArAr Method. A variant of the K-Ar method gives better data by making the overall measurement process simpler. The key is to put the mineral sample in a neutron beam, which converts potassium into argon Because 39Ar has a very short half-life, it is guaranteed to be absent in the sample.

The osteodontokeratic culture complex a. General average dates mostly accepted till today for Australopitecines from East and South Africa are: Concerning the adaptive patterns of early hominins: C and D only. Definite Homo erectus fossil remains have been found in a. Neandertal crania are characterized by a. Chronometric dating or more specifically, radiometric techniques a.

A and C only. A, B, and C. The term "pre-modern Homo sapiens" a. The Acheulian tool industry is found in a. The earliest hominin tools thus far discovered are made of a.

Where have Neandertal skeletal remains NOT been found? A sagittal crest is a. The term Homo ergaster a.

Make The Best Samples For The K/ar And 40ar/39ar Dating Methods

B and C only. The task of interpreting early hominin evolution a.

The subdiscipline of anthropology concerned with various aspects of human language is called. Instead, the ratios of the different argon isotopes are measured, yielding more precise and accurate results. Bishop James Ussher claimed that the earth was created at exactly. What feature s convinced Raymond Dart that the Taung child was not an ape?

Sahelanthropus tchadensis was discovered in a. What feature s convinced Raymond Dart that the Taung child was not an ape? The fact that the deciduous canine teeth were quite small.

The results from a laser probe can be plotted in several graphical ways, including a map of a grain showing lateral argon distribution. Recoil is likely in every potassium-bearing sample, but only becomes a significant problem with very fine grained minerals e. The task of interpreting early hominin evolution a. The diversification of reptiles facilitated by the evolution of the reptilian egg is a good example of.

The position of the foramen magnum, which indicated an erect posture. The shape and orientation of the forehead. The Laetoli footprints e.

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Which of the following hominins has the most primitive ancestral traits? There is no controversy concerning the taxonomic status of many pre-modern specimens. Most fossils are complete and are therefore easily analyzed. The dating of pre-modern specimens is always precise. Most pre-modern specimens have some Homo erectus traits, so evaluating their taxonomic status is complicated.

There is only one hypothesis regarding their species designation. Lived in Africa from m. Was considered a hominin c. Was considered a prosimian d. Lived in America from m. During which of the following epochs did primate-like mammals The stone tool technology most often associated with the Neandertals is termed a. Before hominins made stone tools, they probably a.

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The Laetoli footprints Tanzania show a. All of these e.

Make The Best Samples For The K/ar And 40ar/39ar Dating Methods

Dating methods indicating that something is older or more recent than something else a. The average cranial capacity of H. Robust Australopitcines are normally described as: We have enough evidence suggesting that Neandertals and antomically modern humans co-existed in: The majority of Neandertal fossils have been found in a.

Pre-modern Homo sapiens fossils are found in a. Europe and elsewhere in the Old World. A and D only. Evidence from Zhoukoudian suggests that Homo erectus a. The sum of the genetic, fossil, and archaeological evidence suggests that Neandertals a. B and C only The mosaic concept evolutionary speaking means: Genus Homo evolved in Africa and Asia b.

Different features or traits or characters present similar rates of evolution. Genus Homo evolved in Africa d. Thick cranial and postcranial bones characterize most hominins specimens.

Different features or traits or characters present different rates of evolution. Neandertal brain size a. Most of the archaic Homo lived during the Middle Pleistocene, around: Analysis of the stone artifacts from Zhoukoudian indicate that the tools from a.

Hominins have been variably defined as having a.

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The dating method that uses the principle that undisturbed underlying geologic deposits are older than overlying geologic deposits is called a. Sahelanthropus tchadensis was dated a. The oldest, most securely dated Homo erectus fossils are from a. Relative dating techniques a. The average Neandertal was a. Compared to Homo erectus, the cranium of pre-modern Homo sapiens a.

A and C only e. There is some evidence to suggest that Neandertals a. Upgrade remove ads.