Cretaceous

The Cretaceous-Paleogene boundary that occurred around 65 million years ago marks one of the three largest mass extinctions in the past 500 million years. The hypotheses of Cretaceous-Tertiary boundary impact on Yucatán Peninsula, Mexico shows evidence in the Gulf of Mexico of turbidity currents, and giant waves occurring because of the impact. There is also other evidence that impact ejecta were distributed all over the world. The mineral that was ejected during this impact was iridium. Iridium

forward for the mass extinctions at the end of the Permian and Cretaceous (KT) Periods. A mass extinction is an event in which at least 25-75% of species in the global environment are eradicated in a short period of time. Where as a regional extinction event is when the extinction is confined to a specific zone. Five mass extinctions have occurred throughout time, two of the most well known of these are the Permian and Cretaceous extinction events. There are several hypotheses that are used

Examining the Cretaceous–Paleogene extinction event Over 98% of all organisms that have lived on Earth are now extinct. A mass extinction event occurs when a large number of species die out within a small time frame (relative to the age of Earth). Mass extinctions are intensively studied for both cause and effect, as there is usually room for debate regarding catalysts that precede the extinction and the massive influx of new biological species that follows. There have been five major mass extinctions

The Cretaceous mass extinction is the most well-known case of meteorite impact on the earth, but it certainly is not the only one. It is merely the most well-known. Due to the impact, debris entered earth's atmosphere and caused the plant life of the time to die off due to the lack of sunlight to survive. This made food much more scarce for the species that were dominant at the time. The competition was simply too much for them, and as the plant life died out, so did the herbivores and then the carnivores

Triassic, Jurassic, and Cretaceous periods. They thrived in the Triassic and Jurassic periods, but declined in the Cretaceous period. The Triassic period lasted about 245 to 213 million years ago where dinosaurs first evolved and all the continents were still connected, better known as Pangaea. The Jurassic period continued to the beginning of the Cretaceous period 144 million years ago. At this time, the continents started to break apart and dinosaurs increased in number. The Cretaceous period was the last

northwestern Sudan) and the Dakhla Basin (Egypt) (Fig. 1), have undergone different geological developments. Formation of the Kufra Basin began in the Early Paleozoic, and was complete at the end of the Lower Cretaceous. The Dakhla Basin was presumably formed at the beginning of the Cretaceous (at least its southern portion). In addition to the geological developments described above, the aquifer area also comprises the upper Nile Platform in Egypt, as well as the Northern Sudan Platform in Sudan

The time frame that makes up the Cretaceous-Tertiary period is an area in which causes much controversy and mystery among people. Although research shows us that there was a rapid change in Earth’s climate during this era, there are many different theories that seem to show other sides of the story. During this time there was a global climate change from warm Mesozoic to a cooler Cenozoic (Fluteau, 2014). Although research tells us that there was a substantial change in Earth's climate during this

Oxfordian then followed by the Gascoyne and Cuvier Abyssal Plain in Early Cretaceous around 125 Ma (Fullerton, Sager, & Handschumacher, 1989; Müller, Mihut, & Baldwin, 1998). Passive margin was established in North West Shelf. Rifting phase of the basin transformed into sagging phase post breakup thermal subsidence when Gondwana breakup took place during Valanginian early Cretaceous around 134Ma. During the Campanian late Cretaceous, rifting along the Australian southern margin triggered the basin inversions

Tyrannosaurs Rex, better known as the T-Rex, which means Tyrant lizard king lived during the late Cretaceous period, about 85 million to 65 million years ago. They were 40 feet long and 20 feet tall and weighed up to 7.5 tons. They were strictly carnivores and used their very sharp teeth to eat other dinosaurs. Fossils were discovered in Western North America and the skull of a T- Rex alone measured up to 1.5m(5ft) long. The also have the record of having the largest tooth of any carnivorous dinosaur

(2016), the Araripe group would belong to the Aptian-Albian Stages in the Lower Cretaceous Period. The Crato Formation lithologies were most likely deposited when there was a marine transgression; which is what the Cretaceous period is renowned for (Hu et al. 2012). The build-up of laminated limestones and different lithologies in the stratigraphic column could suggest that it was a lagoon depositional