Paleontology


Book Review: Children of the Ice Age: How a Global Catastrophe Allowed Humans to Evolve by Steven Stanley

Posted by Dave Nichols on October 25, 2009  in 
Children of the Ice Age: How a Global Catastrophe Allowed Humans to Evolve

  (out of 5 stars)

Paleobiologist Steven Stanley considers the impact of major ecological and environmental changes wrought by ice ages on the evolution of human beings in his book Children of the Ice Age. A fascinating subject and impressive theory, the treatment here is disappointing.

I found Stanley's writing to be a bit jarring: the narrative seemed to skip across necessary connections between thoughts. By the time the author got to the primary evidence for his thesis, I had had to reread numerous passages to attempt to understand his points. The writing is not dense or overly-complicated (I am an experienced science reader who often enjoys such dense treatments), but it left me missing the point far too often.

Still, the subject is very interesting, and while I wouldn't recommend this book to many people, those with a keen interest in paleontology, paleobiology, anthropology, evolution, and population migrations will likely find some value in reading Children. Two and one-half stars.

Pterosaur Landing Captured in Fossil Tracks

Posted by Dave Nichols on August 20, 2009  in 
Pterosaur Landing

There have been numerous discoveries of various tracks made by long-extinct species and ancestors of living ones. You can even buy casts of numerous tracks from PaleoScene.

A cool new set of tracks has made news this week, and it appears to show how a pterosaur made its landing. Not Exactly Rocket Science blogger Ed Yong has the scoop:

Several million years ago, at a time when dinosaurs walked the earth, a flying reptile - a pterosaur - came in for a landing. As it approached, it used its powerful wings to slow itself down and hit the ground feet first. It took a short hopping step before landing a second time. On solid ground, it leant forward, put its arms down and walked away on all fours....

The first set of footprints has no corresponding handprints, the heel portion isn't isn't deeper or longer than usual, and there aren't any piles of sediment around them. The pterosaur clearly landed feet-first, but it did so gently rather than braking heavily into the ground. Nonetheless, it wasn't a perfect landing. The slight impressions left by its claws and the short distance before the next set of footprints suggest that the animal stuttered slightly, hopping forward before coming in to land.

For more info on Dinosaur tracks and Ichnology (the study of fossil tracks and other non-skeletal fossils such as eggs), check out this excellent introduction from Glen J. Kuban.

Book Review: Your Inner Fish by Neil Shubin

Posted by Dave Nichols on May 23, 2009  in 
Your Inner Fish: A Journey into the 3.5-Billion-Year History of the Human Body

  (out of 5 stars)

Neil Shubin has presented a short but wonderful account of man's biological connections to numerous species throughout the history of life on Earth. Focusing mainly on paleontology and anatomy, the book offers a fascinating and highly enlightening glimpse at just how connected we really are to other lifeforms. The book does rely on science, but it is largely approachable by any curious reader. The science is carefully presented throughout, but you don't really need to understand a great deal in order to get Shubin's points.

Fish starts off with the story of Shubin's team discovering the Tiktaalik fossil which established a 'missing link' in the transition of life from water-based to land based. Tiktaalik possessed many fish-like qualities, including scales, but also possessed wrists very much like those of modern mammals. Shubin compares various parts of the anatomy of Tiktaalik and other fish to modern humans and shows striking commonality.

From there, Shubin moves on to comparing various parts of human anatomy, such as hands, teeth, and heads, to numerous fossils and various studies which demonstrate striking similarities and shared histories. The discussion of teeth was particularly enjoyable as the reader learns that teeth came before skulls and are shared from a very early time by all decendent creatures.

We are also treated to examples of modern genetic triggers for bodies which can be traced genetically back to times before creatures had bodies. Shubin wraps up the discussion with quick histories of senses and the organs which have developed to utilize them.

Time and again, Shubin offers nuggests of insight that are fascinating and really establishes his case (fairly well agreed upon in modern biology) for the genetic ties between modern humans and practically any other animal life form you can imagine. His discussions of research into genetic triggers and the common usage of the triggers across widely differing species were fascinating and, for me, the highlight of the book. For example, Shubin explains how a trigger used in mouse genes to kick off eye growth could be used in a fly to kick off eye growth. Not just any eye, though, the mouse gene in the fly created fly eyes, and vice versa. Fascinating genetic research.

This is the book to give to creationists who have any semblance of an open-mind. I cannot imagine anyone curious reader being able to reconcile the information in Fish with any notion of creationism. The genetic traits we share with mice, sponges, fish, and birds are too consistent and obvious to deny, so if you have an open-minded creationist in your circle, get them this book pronto.

A fascinating and quick read, Fish was a delight, simply one of the best books I've read this year, and one I will recommend very highly to anyone willing to listen. Even if you think you know a lot about anatomy, biology, or paleontology, there are sure to be some bits in this book that will be new. Four and one-half stars and very highly recommended to anyone.

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