Devonian

Horseshoe crabs are considered “living fossils” or evolutionary survivors because the external appearance barely changed in over 150 million years. The horseshoe crab is part of the arthropods, which include organisms such as spiders and scorpions. The horseshoe crab is made up of the prosoma, which is the head, opisthosoma, which represents the central part of the body and the telson, which is the tail. The tail is harmless and is only used to help the crab flip itself over if it’s turned over

Introduction This report illustrates a geological review of a play within the South Brae oilfield and determines the potential of reservoirs within this area. It is hard to predict and provide ability for oil companies to license an oilfield before drilling therefore it is dependent upon several core sections available to investigate petrographically the northern North Sea. Cores and petrophysical data extracted from blocks 16/7a-A9, 16/7a-A17 and 16/7a-A21 related to licenses in block 16/07a found

Millions of years ago, a catastrophe occurred on our planet and a wide range of animals and plants suddenly died out, from tiny marine organisms to large dinosaurs. With that, scientists estimated that the majority of all species of plants and animals that ever lived are now extinct. The Cretaceous extinction occurred around 65 million years ago. Many species vanished in that extinction. Yet, the fossil evidence of its occurrence is rich. Therefore, scientists have narrowed down several of the most

Lab Lesson 9: Geologic Time (p.203) due end of week 3 Return to Assessment List Part 1 of 1 - 100.0/ 100.0 Points Question 1 of 31 3.0/ 3.0 Points Questions 1 through 3 are based on the Lab Exercise, Step 2. Record your answer to Lab Exercise, Step 2, Question 11. How long ago was the igneous rock in rock unit B formed? A. 352 mya B. 380 mya C. 704 mya D. 1408 mya Answer Key: A Question 2 of 31 3.0/ 3.0 Points

The story of Rosendale cement begins over 375 million years ago during the Ordovician, Silurian and Devonian periods. Layers of sedimentary rock- limestone, dolostone, sandstone, shale, and conglomerate- began to build up in a stratified sequence. During the Devonian period through the Permian, a series of tectonic collisions caused the rock sequence to fold and fault in a way that created brittle fractures. This made the mining of the rock used in natural cement –dolostone- very precarious to mine

Introduction to the Williston Basin The Williston Basin is an intracratonic sedimentary basin that occupies the majority of North and South Dakota, as well as, parts of Wyoming and Montana. The basin also stretches in parts of Canada, but this report will be focused on the United States portion of the basin. This portion of the basin is generally flat with average elevations ranging from 1500 feet to 3000 feet. Precipitation in the basin area ranges from 15 inches to 20 inches per year. The temperature

Human Eye Vs. Animal EyeBy:Andrea Torres ABSTRACT The tapetum lucidum is an evolutionary advantage for animals. It enables animals to see in dimmer light than the animal would otherwise be able to see in. The tapetum lucidum is useful to animals, but it also has a use to humans. Human beings use the tapetum lucidum to scan for reflected eye-shine, in order to detect and identify the species of animals in the dark and to send trained search dogs and search horses out at night. Historically

Animal gigantism was prevalent during the Carboniferous period of the Paleozoic era. Gigantism in flying insects occurred in abundance; however, arthropods, such as arthropleurids, also experienced gigantism. Arthropleurids existed during the Paleozoic era and were the largest land dwelling arthropods in the history of the Earth. 1m long millipedes are classified as arthropleurids. Amphibians such as the terrestrial labyrinthodont amphibians also became gigantic during the Carboniferous period

Introduction: “Limulus polyphemus, the horseshoe crab, inhabits shallow-brackish marine environments ranging from the Atlantic Ocean along the North American coastline to the Gulf coasts of the United states and from the East coast of Mexico to the Yucatan Peninsula” (Walls, Elizabeth). There are three other species of the horseshoe crab worldwide: Tachypleus tridentatus, Tachypleus gigas, and Carconoscorpinus rotundicauda that closely resemble Limulus in structure and habits, ranging from the

Genetics/Reproduction Because of the environment an anglerfish lives in the male is always looking for a mate. Male anglerfish are always smaller than female anglerfish. They have evolved to be parasitic as they attach to the female anglerfish for nutrition. The reproduction process of anglerfish, is an interesting example of sexual dysmorphism. A male anglerfish bites into the female anglerfish with its teeth and attaches to the female. As the male’s mouth and the female’s skin weld the male loses