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If we wish to use a geological process as the geological equivalent of an hourglass, we would want to have similar conditions: we would like to find some quantity which we can measure reliably (corresponding to the condition that we can measure the amount of sand in the lower bulb of the hourglass); which increases or decreases from a known quantity (corresponding to the lower bulb of the hourglass being empty when it starts running) at a known rate (corresponding to knowing the rate of flow of sand); and so forth.Note that the conditions we have given for the hourglass are ideal conditions which we would require to know exactly how long it is since the hourglass started running.In this context, the word "absolute" is not the opposite of "approximate" but just of the word "relative".A method of dating which was accurate to within a billion years either way would still technically speaking be a method of absolute dating, it would just be a very bad one.Suppose that we wanted to find out how long it has been since an hourglass was set running by measuring the amount of sand in the lower bulb.To do so successfully, we would need to assure ourselves of the following conditions: Given these conditions, we can find out how long the hourglass has been running.


If, for example, we cannot measure precisely the amount of sand in the lower bulb, but we have good reason to think that our estimate of it must be within 10% of the true value, then we also have a good reason to think that we can give the time it's been running to within 10%.

We have no reason to believe that nature will be so obliging as to always provide us with the ideal conditions that would provide us with ideal clocks; but by analysis of the geological conditions as they actually are, we can often set limits to how imperfect the geological clocks can be.



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    View full post looks a lot like the 2016 Bible Prophecy Timeline. It is apparent that so many of these events are just about to happen. God told Nahum that the Assyrian Empire will not rise a second time. The flooding of Mosul could be the end time sign that Jesus is Israel’s true Messiah, and that Israel’s time of trouble is about to begin.

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    We also asked online daters what drove them to join the super-tailored sites and whether they have found love in the digital world.

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    As it turned out, Giant's design goals overlapped with what Rock Shox was hoping to achieve with their yet-to-be-released Deluxe and Super Deluxe shocks, and after numerous test sessions (more than with any other bike in Giant's history) the decision was made to go with a trunnion mount, where the shock is attached to the frame on each side of its body, rather than using a single DU bushing in an eyelet at the top of the shock.

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    Assume it's the minimum estimate, the average NHS nurse earns about £23,019 a year so selling the crown jewels for £2 billion would pay for the salaries of 43,478 nurses, as well as 34,482 teachers on an average of about £29,000 a year.

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