Relative dating principle of original horizontality
Recall that most fossils are housed within sedimentary rock, which results from the compaction and cementation of deposited sediments.
A principle of geology, called the states that in a series of undisturbed layers, any layer was deposited after the layers below it (that is, it’s younger than those layers) and before the layers above it (that is, it’s older than those layers).
Both the principle of original horizontality and the law of superposition seem very intuitive and obvious, but they weren’t proposed until the 1600s, both by Danish anatomist, geologist, and priest Nicolaus Steno (1636–1686).
In a nice, simple world, we would have a complete and undisturbed record of sedimentary rocks to help us plot out Earth’s past. All kinds of things happen to rock layers after they form.
The principle of original horizontality was also proposed by Steno.
Translated from Egyptian originals, they are ordered chronologically and were considered by the Egyptians as part of the core of their vast literature.
The study of the sources, hieroglyphs, commentaries and pictures situating the text itself remain on the website at no cost.
alkaline - Term pertaining to a highly basic, as opposed to acidic, substance.
For example, hydroxide or carbonate of sodium or potassium.abyssal plain - The ocean floor offshore from the continental margin, usually very flat with a slight slope.