Gorgon: The Monsters That Ruled the Planet Before Dinosaurs and How They Died in the Greatest Catastrophe in Earth's History
by Peter D. Ward
For more than a decade Peter Ward, his colleagues, and his students tried to determine the cause of the mass extinction marking the end of the Permian by studying the fossils in the Karoo Desert of South Africa. This book is the record of that work.
This book was not at all what I expected when I bought it. From the title and the descriptive blurb on the back, I thought I was buying the popular science version of a paper on gorgonopsians, the lizard-like predator of the upper Permian. Instead, what I got was a memoir covering the ten years of Ward's life he spent working in the Karoo trying to unravel the mystery of the Permian Extinction.
It doesn't matter. This book was a real page turner – I couldn't put it down, and stayed up much later that I should have several nights in a row to read it. The ins and outs of doing field work under such difficult conditions, both natural and political – the Karoo is located largely in South Africa – was fascinating. During the decade of work, friendships began, matured and ended, babies were born and grew, governments rose and fell. Cape Town and Johannesburg became dangerous places to be a white man, and then went back to being no more dangerous than any other major city.
Ward is quite candid about the missteps and dead ends that litter any scientific investigation and which are particularly common in paleontology. The Permian extinction, in which 90-95% of the then-existing life forms perished, is particularly difficult to interpret, due in no small part to the fact that it happened nearly 250 million years ago. His excitement when he writes about finding a well-preserved complete gorgon skeleton is palpable … and contagious.
It isn't until the last chapter that Ward discusses his hypothesis about the end of the Permian, and by that time I was as anxious to hear his hypothesis as I would have been to find out who committed the murder in a novel. Ward's hypothesis is that the Permian extinction was not a single event resulting from a single cause, but from a combination of things: a world-wide drop in sea level, a precipitous drop in the oxygen content of the atmosphere as a result of the oxidation of organic sediments exposed when sea level dropped, increased carbon dioxide in the atmosphere and the inevitable temperature increase. In other words, the Gorgon and most other creatures of the late Permian asphyxiated in the heat. Not a pretty picture.
This book is written in a very accessible manner, with little or no jargon, and the human story is just as compelling as the scientific mystery. I would definitely recommend this book to anyone interested in science, even if they are not professionals in the field.