Info

My first trip to the Karroo was geological tourism. On this, my second trip, I have a definite agenda. I am here to look at the geological beds marking this great extinction with a specific question to answer How long did the extinctions among the Permian protomammals take Elsewhere in the world, the First Event has been studied for well over a century. It has proven to be a frustrating job. During those decades of work, as region by geological region containing rocks of Late Paleozoic and...

Pre Historic Mass Extinctions

Mass extinctions are relatively short intervals of intense species death. During the last 570 million years of earth history, the time since the advent of skeletonized creatures on the earth, there have been about fifteen mass extinctions. Five of these may have involved as many as 50 percent of the earth's species, and two can be classified as major, in the sense that they completely reorganized the ecosystems in the sea and, more relevant to humanity, on land. The first of these two major...

Introduction

Regulator in, air's on, hold the mask, clear below, go. The small boat lurches violently as I roll backward over the side, the large SCUBA tank strapped to my back cushioning my fall into the warm ocean. Finding up after a moment's disorientation, I look about while awaiting my companion's entry. The water is crystal clear, typical of the coral reef regions of our world I feel that I can reach out and touch the seabottom, although it is at least twenty feet below. A noisy splash heralds the...