How WERE the layers of the earth determined/named?

Answer 1

It all began with William Smith in the late 1700's in England. His observations of rocks and formations around him lead to his famous map, the first geologic map of England. His research made him the "Father of Modern Geology", one of the first real geologists.

The principles underlying geologic (geological) time scales were laid down by Nicholas Steno in the late 17th century. Steno argued that rock layers (or strata) are laid down in succession, and that each represents a "slice" of time. He also formulated the principle of superposition, which states that any given stratum is probably older than those above it and younger than those below it. While Steno's principles were simple, applying them to real rocks proved complex.

Determining time sequences was more difficult. Applying modern depositional mechanisms, environments and interpolating a time frame is very subjective, but patterns did arise. Time frames are formulated based on similar characteristics in the rock sequences. A major (or minor) change in the rock character or something that indicates a major depositional environmernt change,. i.e. a warm moist climate changing to a hot arid climate, would often result in a series or period change.

Answers does not offer enough time or space to really explain my answer. Check the links below or, better yet, go to a local library and get a level 1 historical geology book. It will explain things much better.

PS. - Many of the formation names are taken from locations where they are first discovered or occur in abundance. A "type section or location" is where you will find the standard or index formation for that geological unit. It is where the geologist who named the formation first described it and said "this is it".

Answer 2

Very good question. I too have wondered. People sometimes combine layers so it is possible that it will vary with who you talk to. I always felt that five was the most reasonable answer. The 1st layer would be the Crust, the second one would be the Mantle, the third would be the outer core, and the fourth would be the inner core. The fifth one is called many different names. One of the ones I have learned is the center sphere core. Different people may call layers different names or combine layers to get four. Really it all depends on what you were taught or who you talk to. Hope this helps!

Answer 3

the layer idea is only a theory and has never been prove in there for the names were made up by scientist on paper we have never been down past the first layer