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Explore 4 published pages tagged with Stratigraphy, grouped automatically from article text, entity focus, and recurring topical signals.
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geology
Common index fossils are species that lived over wide geographic areas but for relatively short, well-defined spans of geologic time. Because they appear abruptly, are abundant,...
Open articlegeology
The principle of horizontality states that sediments are originally deposited in essentially horizontal layers. If layers are found tilted or folded, deformation occurred after...
Open articlegeology
The principle of original horizontality states that sediments are originally deposited in essentially horizontal or flat layers. Because gravity acts downward in a uniform direc...
Open articlescience
An index fossil is the verified explanation accepted by geology to describe a fossil used to identify and correlate the age of the rock layers in which it occurs. In practice, i...
Open article