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Date 15-05-2008
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Carl Sagan

The Dinosaur Heritage
Environment and Extinction

Don't you touch me, I'm fierce!

Contents

©The Adelphiasophists and AskWhy! Publications. Freely distribute.
Contents Updated: Saturday, 1 March 2008

Abstract

Discussion and extracts of Who Lies Sleeping? The Dinosaur Heritage and the Extinction of Man by Dr Michael D Magee.

Do meteorites look like civilization from the perspective of sediment geochemistry?

Mark McHarvey is aiming to do research in this field and has prepared a research proposal, the abstract of which follows. He has given us permission to post his paper on this website, without the illustrations, and anyone interested can download a zipped Word DOC file of it.

Abstract

Comparisons can been made between anthropogenic inputs to modern sediments, and geochemical anomalies observed in sediments for past mass extinctions. This paper compiles data from publications on the Cretaceous/Tertiary (K/T) boundary and compares the ancient geochemical signals to modern anthropogenic contamination in recent sediments. Above background concentrations in both industrial age and K/T boundary sediments are noted for Ir, Os, Cr, Ni, As, Zn, soot, polycyclic aromatic hydrocarbons (PAH), shocked quartz and tektites. In addition, 13-Carbon depletion is noted for both modern and K/T boundary surface plankton populations. An examination of the Woodside Creek K/T boundary section for the presence of spheroidal carbonaceous particles (SCP), a well known pollution tracer, was undertaken, and no SCP detected. Owing to the limited nature of this study, the comparisons made here are necessarily of a qualitative nature. As such, any of the similarities noted between the modern and KT boundary geochemical record lack relevance when considered in isolation. However, taken together, they make an interesting case for further comparison between these two extinction events.

Last uploaded: 19 April, 2008.

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Before you go, think about this…

For sweating to evolve as a means of keeping cool on dry or even arid grasslands is absurd—it drains the body of essential water and salts. And it would be suicidal for any ape to opt for a water cooling system where water is at a premium—on the dry grasslands. A man walking naked in the tropical sun at 100 degrees Fahrenheit (40 degrees Celsius) can lose up to 28 liters of fluid and an eighth of his body’s salt a day by sweating. For urination only one liter is needed.
Who Lies Sleeping?
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