Fossil strata dating
This may indicate that the shell has absorbed uranium from outside especially in sandy sediments.
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Animal fossils first appear in rocks dating back about 1 billion years.
Because of this fact, most fossils come from the time period dating to almost 600 million years ago, when organisms began to develop skeletons and hard parts.
Smith was the first person to understand the principle of fossil succession.
Fossil succession is based on the observation that certain assemblages, or groups, of animals and plants have lived during certain time periods over geologic history.
He worked in Southern England, and he got to see all kinds of different rock strata that were exposed in outcrops and canals.
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