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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.

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.

When a rock crystallizes from melt (magma and/or lava), it is an igneous rock.

Similar ripples occur in tidal environments and correct interpretation requires that the local facies content be taken into account.PALEONTOLOGY, AND in particular the study of dinosaurs, is an exciting topic to people of all ages.Although most attention in today's world focuses on dinosaurs and why they became extinct, the world of paleontology includes many other interesting organisms which tell us about Earth's past history.Before you begin this activity, read the book chapter listed below, which is available online through Library Reserves.Electronic course reserves, or "e-Reserves," are articles and book chapters that are available online through the University Libraries.

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