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Biology: The Unity and Diversity o...

0th Edition
STARR
ISBN: 9780357093795

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Biology: The Unity and Diversity o...

0th Edition
STARR
ISBN: 9780357093795
Summary Introduction

To determine: The iridium content of the K–Pg boundary layer.

Introduction: The iridium is a chemical element that is abundantly found in the Cretaceous–Paleogene (K–Pg) boundary layer. The iridium level in an average rock is about 0.4 ppb, and in an average meteorite, it is about 550 ppb. This allows scientists to conclude whether the origin of the rocks is from the Earth or from any other sources.

Explanation

As given in the problem statement, Researcher W examined the composition of the K–Pg boundary layer in various parts of the world. He took help from his father to examine the composition of elements in the layer. Researcher L and his colleagues tested the K–Pg boundary layer in Country D and Country I. They discovered that the iridium content was found to be in large quantity than the surrounding rock layers. They also concluded that the boundary layer may have originated with the extraterrestrial material.

Refer to Fig. 16.17, “Abundance of iridium in and near the K-Pg boundary layer”, in the textbook. The given table shows the average abundance of iridium (ppb), and the sample depth (in meters) in Country D. The chemical element iridium was found in abundance on an average of about 41.6 ppb in the K–Pg boundary layer.

Conclusion

The iridium content was 41.6 ppb in the K–Pg boundary layer.

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