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Early geologists, in the 1700s and 1800s, noticed how fossils seemed to occur in sequences: certain assemblages of fossils were always found below other assemblages. Since 1859, paleontologists, or fossil experts, have searched the world for fossils.

In the past 150 years they have not found any fossils that Darwin would not have expected.

A key point is that it is no longer necessary simply to accept one chemical determination of a rock’s age.

Age estimates can be cross-tested by using different isotope pairs.

Since then, geologists have made many tens of thousands of radiometric age determinations, and they have refined the earlier estimates.My sister Karen had picked up our cousin at the airport, but what I didn’t know until he magically walked through the door, was that one of my favorite people in the whole world had flown in from SF to join us.Christopher was there at the beginning of my single days — living with Simone and me in the big blue house, his friendly Bernese Mountain Dog a constant cuddly presence in our lives.All these labors have not led to a single unexpected finding such as a human fossil from the time of the dinosaurs, or a Jurassic dinosaur in the same rocks as Silurian trilobites.Paleontologists now apply sophisticated mathematical techniques to assess the relative quality of particular fossil successions, as well as the entire fossil record.

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The gravitational pull between the Earth and Moon causes the Earths oceans to have tides.