GeologyRocksRock layers
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Hi, welcome to Geology
Tue, 09/18/2012 - 23:29Hi, welcome to Geology Rocks!
Well it certainly depends on the study being conducted! When I was doing my undergrad thesis I logged the section I was working on bed by bed as I was looking for subtle changes in environment causing different fossils to increase/decrease in size and then dissapear. So for an indepth study layer by layer is normally used. However several of my class mates were just mapping the area, so They investigated the rocks in larger packages and were only concerned when a limestone suddenly changed to a sandstone, or there was the sudden intrusion of igneous rocks.
If you're interested in finding out how we as geologists document the layers get on to
stratigraphy.org
You'll find loads of info on there. But generally, we describe rocks as, in the basic sense
"Group - two or more formations
Formation - primary unit of lithostratigraphy
Click on the "Stratigraphy guide" on the site to read more.
Leah
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Rock layers
Submitted by grhvw on Tue, 09/18/2012 - 20:50.Hi,
I'm just interested in geology with little knowledge but gathered from Discovery Channel and National Geographic and some books.
As I was on a bicycle holiday in Germany last summer near Jena I saw some rocks aside the road with many very much small horizontal layers between 1 and 10 cm thick. (I guess former seefloor)
I was asking myself if these layers are somehow (by some institute, university e.t.c.) investigated and documented by individual layer or are they just somewhere documented as a 'bunch of layers' from a certain geological period? I just would like to have some insight on what level geological investigation is executed today.
thanks
Henk