# Fossils in lower rock layers are always

Fossils in lower rock layers are always

## This Post Has 8 Comments

1. myronpacis1128 says:

The fossil record shows which organisms have a common ancestor.

The fossil record can be used to develop a timeline of Earth’s history.

The fossil record shows which organisms existed at the same time.

2. austintules2005 says:

The fault is younger than the lower rocks but older those above it.

Explanation:

A fault found that cuts through lower rock layers but not those above it suggests that the fault is younger than the lower rock but older than those above it.

This interpretation is based on the principle of cross-cutting which states that "an intrusion or fault is younger than the rocks they cut through".

In essence, an intrusion or fault cannot cut through a rock sequence unless it is already in place. This is why the fault that cuts through the rock layers is younger than the rock layers. But since it did not pass through the layers above, it is older than it.

Movement along faults

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3. Bryson2148 says:

b. The fault is younger than the layers it cuts  through, but older than the layers above it.

Explanation:

Since the fault cuts through the lower rock layers and terminates against the ones above it, we can conclude that the fault is younger than the layers it cut through but older than the layers above it.

We know this based on the principle of cross-cutting.

The principle of cross-cutting relationship suggests that "a fault and an intrusion is younger than the rocks they cut through".

This principle is very important in determining the relative age of sedimentary strata. The rock units through which a fault permeates must have been there before the fault formed. So they are older. If the overlying layer above the fault is not affected then it is younger than the faulting event

Fault

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4. jambunny26 says:

I know the person that answered before me is right but for anyone who wants quick reference so you don't have to read the whole answer, (me cause i am lazy) its b,c,d

Explanation:

Doing this was probably useless but I just wanna to make it easier. To the person who answered before me, thank you 🙂

5. trippie4life says:

Q 1

upper mantle

iner core

Q2

tectonic plates don't move

Q3

confusion

Explanation:

6. lailahussain99 says: