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That fossil species may have been dated somewhere else, so you can match them and say that your fossil has a similar age.

Some of the most useful fossils for dating purposes are very small ones.

The activity offers literacy opportunities as well as practice using the science capability 'Interpret representations'.

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Suppose you find a fossil at one place that cannot be dated using absolute methods.

The geologic time scale was initially developed by determining the relative ages of rock units, first in Europe, and then in other parts of the world. To determine which rock units were older and which ones were younger (in a relative sense), geologists devised a number of laws, or principles, to help figure out the sequence of geologic events in a particular locality.

In this lab, you will apply many of these laws and principles to determine the relative sequence of geologic events that created a particular set of rock layers and intrusions.

By doing this, you will unravel the geologic history recorded in the rock record, just as geologists did hundreds of years ago, and still do today. An earlier current-formed ripple set (at bottom of slide) was later modified by a second ripple train migrating at right angles to the first.

Crests of the first set are preserved in the troughs of the second set, hence, the ladderback appearance.Before you begin this activity, read the book chapter listed below, which is available online through Library Reserves.