In undisturbed strata of sedimentary rocks, a. the oldest...

Key Concepts

Principle of Superposition

This principle asserts that in any sequence of undisturbed sedimentary rock layers, the oldest layers are found at the bottom while the layers become progressively younger toward the top. It is a fundamental concept in geology used to interpret the chronological sequence of events in Earth’s history.

Stratigraphy

Stratigraphy is the study of rock layers and layering. It involves analyzing the arrangement, composition, and relationship of sedimentary rocks, which allows geologists to reconstruct past geological events and understand the temporal sequence of Earth's history.

Transcript

00:01 All right, so for this question, we are talking about undisturbed strata of sedimentary rock.

00:05 So what the heck does this mean? because this is, we're just getting into a little bit of the chapter, and we're talking about determining ages of the earth and the organisms that lived on it.

00:17 That's sort of topic.

00:19 But here we're talking about a very specific question, about undisturbed strata of sedimentary rock.

00:26 Okay? so when we're talking about undisturbed, obviously it's not been tampered with.

00:33 It is as natural as it could be in this period of time based on when it began to form and get the strata.

00:42 In strata, we're thinking about stratification.

00:45 So by stratification, we're thinking about different parts or layers.

00:48 For this context, we're thinking about layers, right? so we're looking at the different layers, different parts.

00:58 What we are really trying to look at is finding the relative ages about these different layers.

01:06 So if we have a big piece of sedimentary rock, which we can classify as, you know, there's different kinds of rock out there.

01:13 If you're geologists, i'm sure you're very familiar with this.

01:15 If not, then it's okay.

01:16 We're just looking at different parts of the earth that are consisting of rock.

01:22 And the part of the earth we're looking at is going to be sedimentary rocks because we can see these different layers.

01:29 And we can compare the relative ages to one another, which is very useful for determining ages and time periods and that sort of thing.

01:35 So we have these different layers.

01:37 So we might have, i'm going to redraw this to make it a little more clear and concise.

01:42 So we can have one layer here and then one layer here.

01:47 If you ever been to some really interesting geological places, maybe out west in the desert, maybe in colorado, maybe on the west coast in florida, we're not in california.

02:00 Either way, we might be able to see some unique areas where we can see different layers of rock throughout time.

02:04 And this is where we can really look at different times.

02:06 Periods.

02:07 So for this question, we need to understand how these are developing, how we develop these different layers across time.

02:16 So are we looking at, what does it go from old to young reforming these layers? or does it go from young to old? that is essentially what we need to be concerned with as we answer these questions.

02:35 And your hypothesis, which maybe you're on the right track, that the oldest layers lie at the bottom in a successfully higher strata or progressively younger...

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