For example, based on the primate fossil record, scientists know that living primates evolved from fossil primates and that this evolutionary history took tens of millions of years.
By comparing fossils of different primate species, scientists can examine how features changed and how primates evolved through time.
However, by itself a fossil has little meaning unless it is placed within some context.
All the dishes shown on the television series appear in my new book, along with many more that it wasn’t possible to show.
I do hope you’ll enjoy trying them and, in the process, discover a few absolute favourites of your own.' Mary Berry Mary Berry Absolute Favourites will be published by BBC Books on Thursday, price £25.
Strata Thickness- In the late 1800s, a British geologist estimated that 75 million years has lapsed since the beginning of the Cambrian.
This estimate was based upon the maximum known thickness of strata (from Cambrian to present) divided by the average rate of sedimentation in modern environments. Joly used the salinity of ocean water to determine the age of the earth.