The correct answer is: The principle of original horizontality provides the basis for the law of superposition.
<em>The principle of original horizontality</em> <u>stated that all rock layers were originally horizontal </u>(<em>in sedimentary rocks</em>). This principle set the ground for Geologists to figure out The law of superposition which states that <u>the youngest layer is on top and the oldest is on bottom </u>in any sequence of sediments and rocks.
Answer: 582 BC: Pythian Games founded at Delphi (traditional date). 580 BC: Cambyses I succeeds Cyrus I as King of Anshan and head of the Achaemenid dynasty (approximate date).