Earth science lab relative dating 1 answers

A type of fault where the hanging wall slides downward; caused….Feature that cuts across a body of sediment of rock is younger….

Thus, he already ‘knows’ that the igneous dyke must be younger than 200 million years and older than 30 million years.

(Creationists do not agree with these ages of millions of years because of the assumptions they are based on.) Because of his interest in the volcanic dyke, he collects a sample, being careful to select rock that looks fresh and unaltered.

He assumes therefore that Sedimentary Rocks A are the same age as the other rocks in the region, which have already been dated by other geologists.

In the same way, by identifying fossils, he may have related Sedimentary Rocks B with some other rocks.

Since relative dating can easily be verified by superposition (the younger bed over the older one), intrusion (the intrusive being younger than the intrusive rock), and use of index fossils (younger fossils in a rock layer make that layer younger than another containing older fossils), relative dating can be confirmed right at the field using one's direct observation.

It could also be immediately confirmed in the base office once maps and cross sections are updated and the rock units confirmed.

Earth Science Teacher Resources mrsciguy Occurred earth science lab module relative.

by Tas Walker A geologist works out the relative age of a rock by carefully studying where the rock is found in the field.

The field relationships, as they are called, are of primary importance and all radiometric dates are evaluated against them.

For example, a geologist may examine a cutting where the rocks appear as shown in Figure 1.

Absolute dating entails laboratory analysis of rock samples that will take a longer time.

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