Silurian

marked the end of the Ordovician period. Silurian: • This period started 438 million years ago and ended 408 million years ago. • The first vascular plants appear on land (plants with water-conducting tissue). High seas spread worldwide, brachiopods, crinoids and corals also make an appearance. • The first fish with jaws appeared during this time period along with insects, centipedes and millipedes. • Glaciation marked the end of the Silurian period. Devonian: • This period started 410

The bioregion of the Slate Belt is in the northeastern most corner of Northampton County Pennsylvania. This bioregion is unique to others in the region due to the Martinsville Shale deposits. These deposits contain high quality slate that when quarried and sold on the market, lead the industry in the United State for over 100 years. The industry in the south valley consists of cement plants due to rich limestone deposits and abandoned iron mines in the west for the now defunct Bethlehem Steel. To

Approximately 66 million years ago, the first, and most recent extinction event of ‘the Big Five’ took place- the Cretaceous-Paleogene (K-Pg) Extinction, also known as the Cretaceous-Tertiary (K-T) Extinction. While this event is known primarily for its involvement in the extinction of dinosaurs, it also had quite the effect on a large majority of other plant and animal species, to the point where no tetrapod (four-legged vertebrae) weighing above 25 kilograms survived. The original trigger is

was being altered by drifting land masses. Sea levels and ocean temperatures dropped significantly due to the formation of glaciers. This led to the extinction of corals and as much as 60% of all marine life, this period is called “the Ordovician–Silurian Extinction Event.” Corals came back during the Devonian period around 410 million years ago and began to form reef systems. These early coral reefs were composed of stromatoporoids, tabulate corals, rugose corals, and ancestors of the

biodiversity in a short amount of time. This type of event may be caused by a natural disaster or a fast change in the environment and the animals can’t adapt to it fast enough. The mass extinction of Ordovician-Silurian occurred 445.2-443.4 Million years ago. The end period Ordrivacan and the strat Silurian period. Scientists believe the cause of the event was sea levels decreased because of glaciation; forming glaciers or covering over the African and South American portions of Gondwana. The plant was mostly

Abstract: Determining the location of the Shawangunk Mountain formation from our position on the outcrop can demonstrate a lot about the upbringing of this formation. The Shawangunk Formation, consisting of quartz pebble conglomerate from the Middle Silurian age, extends from south of the Hudson Valley down south until Virginia. The vanishing of the formation within the area of Rosendale, NY has led to investigations of tectonic events. Due to the Taconic orogeny, we see the formation of the Shawangunk

As, the director, of the natural history museum I have created a display dedicated to the Paleozoic time period. In order to boost the attendance, I have designed an interactive set of exhibits and displays for the Paleozoic Era. Guest will enter the museum together in a main room once everyone was seated you would turn down the lights and with a 3 - D show the beginning of the era which was the breakup of one supercontinent and the formation of another. A speaker will explain how the Paleozoic

geographic regions of Virginia, the Valley and Ridge of Virginia plays an important role in the geology of Virginia starting from its Proterozoic period that dates back to 600 Ma through Cenozoic period in 0 Ma. The significant activities during the Silurian period as far as sediment deposition is concerned include erosion of Taconic Mountains and deposition of clastic wedge, such as Juniata Formation and Tuscarora Formation; and as far as carbonate deposition is concerned, these activities included

Melbourne has a bedrock of Middle Paleozoic age which is included within the Devonian and Silurian periods (354-441 million years prior). These rocks are overlain in wide zones which also include much more youthful rocks, and were generally part of the Tertiary and Quaternary ages (2-65 mya). Rocks of Early Silurian (441 mya) were discovered to be the most established within the bedrock. Particular in the outcrops located in the north-east around Warrandyte (Anderson Creek Formation), and on the

In the course of Earth’s history, there have been five major extinction events: the Ordovician-Silurian, Late Devonian, Permian-Triassic, Triassic-Jurassic, and Cretaceous-Paleogene extinction events. Now, according to Pulitzer Prize-winning author Elizabeth Kolbert, we are entering another one that is caused by a single species: ours. Human beings have decimated the rainforest, hunted animals like the great auk to extinction, pumped billions of tons of pollution into our atmosphere and oceans