To save this word, you’ll need to log in. Examples of date in a Sentence Verb She dated a couple guys during college. He only dates younger women. They’ve been dating for six months. Don’t forget to sign and date the application. The letter was not dated. The ancient building was dated by a coin found in one of the rooms. Scientists use various techniques to date fossils. See more words from the same century From the Editors at Merriam-Webster.
Dating the origin and dispersal of hepatitis B virus infection in humans and primates
Pan-Chelidae Testudines, Pleurodira is a group of side-necked turtles with a currently disjointed distribution in South America and Australasia and characterized by two morphotypes: the long-necked and the short-necked chelids. Both geographic groups include both morphotypes, but different phylogenetic signals are obtained from morphological and molecular data, suggesting the monophyly of the long-necked chelids or the independent evolution of this trait in both groups.
In this paper, we addressed this conflict by compiling and editing available molecular and morphological data for Pan-Chelidae, and performing phylogenetic and dating analyses over the individual and the combined datasets. Our total-evidence phylogenetic analysis recovered the clade Chelidae as monophyletic and as sister group of a clade of South American extinct chelids; furthermore Chelidae retained inside the classical molecular structure with the addition of extinct taxa in both the Australasian and the South American clades.
Our dating results suggest a Middle Jurassic origin for the total clade Pan-Chelidae, an Early Cretaceous origin for Chelidae, a Late Cretaceous basal diversification of both geographic clades with the emergence of long-necked lineages, and an Eocene diversification at genera level, with the emergence of some species before the final breakup of Southern Gondwana and the remaining species after this event.
THE ORIGIN OF PLAGIOGRANITES: COUPLED SIMS O ISOTOPE RATIOS, U-Pb DATING AND TRACE ELEMENT COMPOSITION OF.
The spinicaudatan clam shrimp is a group of branchiopod crustaceans that has existed as far back as the Devonian and well-preserved fossils are known. Evidence of monophyly exists for only one family Limnadiidae , which has a worldwide distribution and morphological conservatism. The evolutionary relationships among genera and diversification mechanisms are not deeply resolved as well as origin of the genus Eulimnadia.
To address these issues, we constructed phylogenies of limnadiid clam shrimp, with both Bayesian inference and maximum likelihood methods to infer limnadiid evolutionary relationships. We then performed dated phylogenies using a relaxed clock of the Spinicaudata using fossil calibrations. Divergence date estimates show a perfect match with the break up of the Pangaea that could explain current limnadiid distributions; however the genus Eulimnadia apparently diverged 30 Ma ago.
Eulimnadia phylogeography suggests an American origin and ecological patterns were analyzed to propose hypotheses on its origin and spread. This genus also shows a strong dispersive capacity, which could be explained by its reproduction modalities androdioecy. This study and this first phylogeny with fossil calibration date the current distribution of Spinicaudata and reveal congruence with continental drift, except for Eulimnadia.
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The History of Dating
U-Pb ages, trace element content and oxygen isotope ratios of single zircons from five plagiogranite intrusions of the Troodos ophiolite were measured in order to determine their crystallization age and assess the importance of fractional crystallization versus crustal anatexis in their petrogenesis. The results indicate that oceanic magmatism in Troodos took place at The new age inferred for seafloor spreading and ocean crust accretion in Troodos nearly overlaps that of the Semail ophiolite in Oman Ma , strengthening previous indications for simultaneous evolution of both ophiolites in similar tectonic settings.
The lower values in this range are lower than those expected in equilibrium with mantle-derived melt 5. The inferred high percentage of crustal component is consistent with the existence of a shallow axial magma chamber, typical of fast spreading MOR settings, within the Troodos slow-spreading ridge environment. This apparent contradiction may be reconciled by episodically intense magmatism within an otherwise slow, magmatically-deprived spreading axis.
Roberts, R.G., Rhys Jones & Smith, M.A. Thermoluminescence dating of a 50,year-old human occupation site in northern Australia, Nature, Lond.
In order for a radioactive parent-daughter pair to be useful for dating, many criteria must be met. This section examines these criteria and explores the ways in which the reliability of the ages measured can be assessed. Because geologic materials are diverse in their origin and chemical content and datable elements are unequally distributed, each method has its strengths and weaknesses. Of these, only the radioisotopes with extremely long half-lives remain.
It should be mentioned in passing that some of the radioisotopes present early in the history of the solar system and now completely extinct have been recorded in meteorites in the form of the elevated abundances of their daughter isotopes. Analysis of such meteorites makes it possible to estimate the time that elapsed between element creation and meteorite formation.
Natural elements that are still radioactive today produce daughter products at a very slow rate; hence, it is easy to date very old minerals but difficult to obtain the age of those formed in the recent geologic past.
The Origin of Modern Humans and the Impact of Chronometric Dating
A nervous young man arrives at the door of a majestic brownstone townhouse. He carries a small wood box containing a silver bracelet and ring, and a bouquet of resplendent burgundy tulips. He raps on the door, squares his shoulders and runs through the words of his speech.
Dating the origin of HIV-1 subtypes. Jaap Goudsmit &; Vladimir V. Lukashov. Nature volume , pages–()Cite this article.
By Larry Getlen. But when these single women, stripped from their dependency on fathers and husbands, began to be courted in public, police, politicians, and civic leaders were alarmed. These circumstances gave birth to dating rituals and other unfortunate traditions that still remain — or, at least, still cause confusion as mores change — today. In , the average female worker earned less than half of what a man would earn in the same position. But as these women were courted in public, efforts were undertaken to curb what authorities viewed as a potential public menace.
She recalls the report of one such special agent, staked out at the Strand Hotel in Midtown, who noted that the women he was spying on did not seem like prostitutes, per se, but were concerning nonetheless. Rockefeller Jr. It sounds like a joke, until you learn that some women were thrown in jail for this horrible crime. They saw them as romantic. If the American Dream for men was to work hard and become a success, the equivalent for women was to get a good job and marry your rich boss.
The other alternative was for women to take jobs in high-class department stores where rich men were likely to shop.
Evaluation and presentation schemes in dating
Subscriber Account active since. Of all the rituals of love, the first date is perhaps the most paramount — and the most dreaded. Hundreds of questions surround the pivotal event: How do you secure a date? What will you do once you’ve got one?
Examined the association between witnessing interparental violence as a child, being a victim of parental physical violence, and perpetrating violence in dating.
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Dating of the Limnadiidae family suggests an American origin of Eulimnadia
It was hard not to take it as a sign, a personal comment on my own Jewish dating failings. JSwipe is neither the first nor the most recent Jewish dating app. And yet we keep devouring the ever-increasing array of Jewish dating apps and sites and Facebook groups–why?
1. IT WASN’T ALWAYS CALLED “.
Moderate-large earthquakes usually trigger a large number of landslides. The prehistoric large landslides can be analyzed to determine the probability of its seismic origin, and further recognized as an indicator of fault activity and earthquake intensity. Based on field investigation, high-resolution satellite image interpretation and cosmogenic exposure dating of landslide deposit, the paper presents a large, long-runout Luanshibao rock avalanche the LSB rock avalanche , southeast Tibet.
It suggests that the Maoya section of Litang fault is probably more dangerous than other sections due to the high density of large co-seismic landslides, which could present useful reference for the alignment selection of future Sichuan-Tibet railway. This is a preview of subscription content, log in to check access. Rent this article via DeepDyve. Adushkin VV Mobility of rock avalanches triggered by underground nuclear explosions. In landslides from massive rock slope failure Edited by S.