Cretaceous–Tertiary extinction event

I'm going to talk about the geologic evidence of the permian triassic extinction. This is a volcanic scenario. There are different geologic reasons for the permian triassic i'm going to tell you about them . During this period there has been documented changes in the air. The atmosphere went evey high which means high levels oxygen was about 30%. When it was low it was about 15%. In this time the salinity in the sea was filled with sharply during the period about 250 million years ago…

could completely dismantle an entire species, let alone a body of dinosaurs. Consequently, the debacle on the causes of dinosaur extinction have baffled the minds of paleontologists for centuries. Geologist and zoologist Stephen Jay Gould published “Sex, Drugs, Disasters, and the Extinction of Dinosaurs,” to compare scientific and speculative causes of dinosaur extinction. This passage is highly informative and enjoyable. Gould provides three theories-- sex, drugs, and disasters-- that…

The Permian-Triassic extinction is seen as one of the largest mass extinction in the history of life. According to the McGraw-Hill Dictionary (2003) it can be defined as a mass extinction event marking the division between the Permian Period and the Triassic Period as well as the border between the Palaeozoic and Mesozoic eras. It is estimated to have triggered the extinction of 90% or more of all ocean species, approximately 70% of land vertebrates, and significant extinctions of plants and…

continent of Gondwana. Then Gondwana drifted south during this time, then finally settled in the Southern Hemisphere. The climate was mostly warm and humid and during this time sea levels were rising. At the end of the Ordovician period there was a mass extinction. The third period in the Paleozoic Era was the Silurian Period. During this time sea levels were rising more and continental land masses were low. Also, having a warm climate caused ice glaciers to melt. Gondwana was still located in…

The Sixth Extinction: An Unnatural History is by Elizabeth Kolbert. Kolbert is an American journalist, observer, author, and staff writer at The New Yorker. The Sixth Extinction won the Pulitzer Prize in 2015; I chose this nonfiction book because I hadn’t heard of the concept of a sixth extinction. I had previously learned of multiple extinctions that occurred in the Cretaceous, Ordovician, Permian, and Triassic-Jurassic periods, but I became curious just by the thought of what Kolbert meant by…

Chicxulub Crater and Mass Extinctions.” This book began talking about the five mass extinctions and what a mass extinction was. It stated that the best studied of all mass extinctions was the fifth mass extinction. This is because it was the closest to us in time, and it wiped out roughly 70% of all species. This lead to the books next topic, how this mass extinction occurred. In the beginning, most scientists were gradualists, meaning they believed the fifth mass extinction happened gradually.…

Brontosaurus Othniel Charles Marsh discovered and named the Brontosaurus (Greek “thunder lizard”), a four-legged dinosaur in 1879. With at least three known species, this dinosaur lived in the Morrison Formation of present day Western US, during the late Jurassic Period and became extinct by the end of the period. Perhaps one of the most controversially classified dinosaurs, paleontologists have reclassified the Brontosaurus several times since its discovery to an extent that some quarters…

Five extinctions of Earth and Who will be Next? The Earth we live on now is drastically different from how it was millions of years ago. The Earth has gone through many changes and events though time. There are five major events in history that have changed the world. Without these five mass extinctions who knows what Earth would have looked like, and if humans would even be alive. In the ordovician period 439 million years ago there was a mass extinction that wiped out 89% of life on Earth.…

believed to be wiped out by a meteorite/asteroid or another catastrophic event. How did an asteroid cause a mass extinction causing the majority of a planet’s population to die? Newton’s laws of motion can explain how and why a asteroid caused a mass extinction wiping out an entire planet’s evolution. Scientist have multiple hypotheses leading to the end of the Cretaceous Era or T-K event. One of such, is the astronomical event that hit the earth sending an immense amount of debris and dust…

Our planet is in the middle of the sixth mass extinction of mammals, fish, amphibians, reptiles, birds and plants. We are currently experiencing the worst case of extinction than the dinosaurs which was 65 million years ago. Extinction may be a natural event but there has been a recent increase of species extinction from 1000 to 10,000 per year. This means in the future we may lose species every day [1]. Before extinction was caused by earthquakes, volcanic eruption and climate change but this…