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Cross-References ASTEROID IMPACT Definition and Introduction History of Impact Cratering Studies
18 ASTEROID IMPACT Tedesco, E. F., Noah, P. V., Noah, M., and Price, S. D., 2002. The identification and confirmation of impact structures on supplemental IRAS minor planet survey. The Astronomical Earth were developed: (a) crater morphology, (b) geo- 123 – Journal, , 1056 1085. physical anomalies, (c) evidence for shock metamor- Tholen, D. J., and Barucci, M. A., 1989. Asteroid taxonomy. In Binzel, R. P., Gehrels, T., and Matthews, M. S. (eds.), phism, and (d) the presence of meteorites or geochemical Asteroids II. Tucson: University of Arizona Press, pp. 298–315. evidence for traces of the meteoritic projectile – of which Yeomans, D., and Baalke, R., 2009. Near Earth Object Program. only (c) and (d) can provide confirming evidence. Remote Available from World Wide Web: http://neo.jpl.nasa.gov/ sensing, including morphological observations, as well programs. as geophysical studies, cannot provide confirming evi- dence – which requires the study of actual rock samples. Cross-references Impacts influenced the geological and biological evolu- tion of our own planet; the best known example is the link Albedo between the 200-km-diameter Chicxulub impact structure Asteroid Impact Asteroid Impact Mitigation in Mexico and the Cretaceous-Tertiary boundary. Under- Asteroid Impact Prediction standing impact structures, their formation processes, Torino Scale and their consequences should be of interest not only to Earth and planetary scientists, but also to society in general. ASTEROID IMPACT History of impact cratering studies In the geological sciences, it has only recently been recog- Christian Koeberl nized how important the process of impact cratering is on Natural History Museum, Vienna, Austria a planetary scale. -
Geological Timeline
Geological Timeline In this pack you will find information and activities to help your class grasp the concept of geological time, just how old our planet is, and just how young we, as a species, are. Planet Earth is 4,600 million years old. We all know this is very old indeed, but big numbers like this are always difficult to get your head around. The activities in this pack will help your class to make visual representations of the age of the Earth to help them get to grips with the timescales involved. Important EvEnts In thE Earth’s hIstory 4600 mya (million years ago) – Planet Earth formed. Dust left over from the birth of the sun clumped together to form planet Earth. The other planets in our solar system were also formed in this way at about the same time. 4500 mya – Earth’s core and crust formed. Dense metals sank to the centre of the Earth and formed the core, while the outside layer cooled and solidified to form the Earth’s crust. 4400 mya – The Earth’s first oceans formed. Water vapour was released into the Earth’s atmosphere by volcanism. It then cooled, fell back down as rain, and formed the Earth’s first oceans. Some water may also have been brought to Earth by comets and asteroids. 3850 mya – The first life appeared on Earth. It was very simple single-celled organisms. Exactly how life first arose is a mystery. 1500 mya – Oxygen began to accumulate in the Earth’s atmosphere. Oxygen is made by cyanobacteria (blue-green algae) as a product of photosynthesis. -
Asteroid Impact, Not Volcanism, Caused the End-Cretaceous Dinosaur Extinction
Asteroid impact, not volcanism, caused the end-Cretaceous dinosaur extinction Alfio Alessandro Chiarenzaa,b,1,2, Alexander Farnsworthc,1, Philip D. Mannionb, Daniel J. Luntc, Paul J. Valdesc, Joanna V. Morgana, and Peter A. Allisona aDepartment of Earth Science and Engineering, Imperial College London, South Kensington, SW7 2AZ London, United Kingdom; bDepartment of Earth Sciences, University College London, WC1E 6BT London, United Kingdom; and cSchool of Geographical Sciences, University of Bristol, BS8 1TH Bristol, United Kingdom Edited by Nils Chr. Stenseth, University of Oslo, Oslo, Norway, and approved May 21, 2020 (received for review April 1, 2020) The Cretaceous/Paleogene mass extinction, 66 Ma, included the (17). However, the timing and size of each eruptive event are demise of non-avian dinosaurs. Intense debate has focused on the highly contentious in relation to the mass extinction event (8–10). relative roles of Deccan volcanism and the Chicxulub asteroid im- An asteroid, ∼10 km in diameter, impacted at Chicxulub, in pact as kill mechanisms for this event. Here, we combine fossil- the present-day Gulf of Mexico, 66 Ma (4, 18, 19), leaving a crater occurrence data with paleoclimate and habitat suitability models ∼180 to 200 km in diameter (Fig. 1A). This impactor struck car- to evaluate dinosaur habitability in the wake of various asteroid bonate and sulfate-rich sediments, leading to the ejection and impact and Deccan volcanism scenarios. Asteroid impact models global dispersal of large quantities of dust, ash, sulfur, and other generate a prolonged cold winter that suppresses potential global aerosols into the atmosphere (4, 18–20). These atmospheric dinosaur habitats. -
From: Wilkinson, Eric
From: Wilkinson, Eric [mailto:[email protected]] Sent: Wednesday, January 30, 2013 11:13 AM To: Margolis, Anne Cc: McNamara, Ed; [email protected]; Krolewski, Mary-Jo Subject: VEGSPC Comments from ISO New England Hello, Please accept the attached comments from ISO New England. Do not hesitate to contact me if I can provide any more information to the Commission. Regards, Eric Wilkinson External Affairs ISO New England One Sullivan Road Holyoke, MA 01040 Office 413.540.4686 Mobile 413.387.7197 Fax 413.535.4379 [email protected] Please consider the impact to the environment and your responsibility before printing this e-mail. memo To: Vermont Energy Generation Siting Policy Commission From: Eric Wilkinson Date: January 30, 2013 Subject: Comments of ISO New England ISO New England (ISO) appreciates the opportunity to provide comments to the Vermont Energy Generation Siting Policy Commission (Commission). The ISO is a private, non-profit entity that serves as the regional transmission organization for New England. The ISO operates the New England bulk power system and administers New England’s organized wholesale electricity markets. Planning the bulk power system is also key a responsibility of the ISO. Part of this planning responsibility includes studying the potential reliability impacts of proposed new generation resources on the bulk power system. This is an important function as the ISO is responsible for maintaining reliability and must meet regional and national reliability criteria. The purpose of these comments is to make the Commission aware of the ISO’s role in the interconnection of energy generation resources. -
What Killed the Dinosaurs?
What killed the dinosaurs? The impact theory The impact theory was beautifully simple and appealing. Much of its evidence was drawn from a thin layer of rock known as the 'KT boundary'. This layer is 65 million years old (which is around the time when the dinosaurs disappeared) and is found around the world exposed in cliffs and mines. For supporters of the impact theory, the KT boundary layers contained two crucial clues. In 1979 scientists discovered that there were high concentrations of a rare element called iridium, which they thought could only have come from an asteroid. Right underneath the iridium was a layer of 'spherules', tiny balls of rock which seemed to have been condensed from rock which had been vapourised by a massive impact. On the basis of the spherules and a range of other evidence, Dr Alan Hildebrand of the University of Calgary deduced that the impact must have happened in the Yucatan peninsula, at the site of a crater known as Chicxulub. Chemical analysis later confirmed that the spherules had indeed come from rocks within the crater. The impact theory seemed to provide the complete answer. In many locations around the world, the iridium layer (evidence of an asteroid impact) sits right on top of the spherule layer (evidence that the impact was at Chicxulub). So Hildebrand and other supporters of the impact theory argued that there was one massive impact 65 million years ago, and that it was at Chicxulub. This, they concluded, must have finished off the dinosaurs by a variety of mechanisms. -
News Release 33 Edgemont Drive Presque Isle, ME 04769
Contact: Jason Parent Development and College Relations Office News Release 33 Edgemont Drive Presque Isle, ME 04769 Phone: (207) 768-2808 Fax: (207) 760-1101 May 3, 2011 [email protected] NR11055 New England’s first home-grown wind power technicians finding jobs in industry Aroostook County - In the fall of 2009, 30-year-old Matthew Melcher of Bingham left the small Somerset County town he grew up in to head north to Aroostook County to follow his dream to become a wind power technician. That same year, Neil Berry of Ashland, who had built his career in a lumber mill he thought he would work in until his retirement, suddenly found himself in his late 40’s without a job; the victim of a nationwide downturn in the forest products industry. He too looked to the sky, specifically the wind turbines that were popping up throughout Maine, for his future, joining Melcher and the other members of the first incoming class in the brand new associate degree wind power technology program at Northern Maine Community College. On Saturday, May 14, Melcher, Berry and a dozen of their classmates will be the first to earn such a credential from a higher education institution in New England. The pioneers, some of whom have accepted employment offers in the industry, others who are now interviewing for jobs both in and out-of-state, and others who intend to further their education in the fall, are the first to admit the past two years have been a whirlwind, both in the classroom and in the industry itself. -
“Impact Winter” Guest: Ben Murray [Intro Music] JOSH: Hello, You're Listening to the West Wing
The West Wing Weekly 6.09: “Impact Winter” Guest: Ben Murray [Intro Music] JOSH: Hello, you’re listening to The West Wing Weekly. I’m Joshua Malina. HRISHI: And I’m Hrishikesh Hirway. Today, we’re talking about Season 6 Episode 9. It’s called “Impact Winter”. JOSH: This episode was written by Debora Cahn. This episode was directed by Lesli Linka Glatter. This episode first aired on December 15th, 2004. HRISHI: Two episodes ago, in episode 6:07, the title was “A Change is Gonna Come,” and I think in this episode the changes arrive. JOSH: Aaaahhh. HRISHI: The President goes to China, but he is severely impaired by his MS. Charlie pushes C.J. to consider her next step after she steps out of the White House, and Josh considers his next step after it turns out Donna has already considered what her next step will be. JOSH: Indeed. HRISHI: Later in this episode we’re going to be joined by Ben Murray who made his debut on The West Wing in the last episode. He plays Curtis, the president’s new personal assistant to replace Charlie. JOSH: A man who has held Martin Sheen in his arms. I mean, I’ve done that off camera, but he did it on television. HRISHI: [Laughs] Little do our listeners know that Martin Sheen insists on being carried everywhere. JOSH: That’s right. I was amazed all these years later when Martin showed up for his interview with us that Ben was carrying him. That was the first time we met him. -
Diamondback Terrapin, Malaclemys Terrapin, Nesting and Overwintering Ecology
Diamondback Terrapin, Malaclemys terrapin, Nesting and Overwintering Ecology A thesis presented to the faculty of the College of Arts and Sciences of Ohio University In partial fulfillment of the requirements for the degree Master of Science Leah J. Graham June 2009 © 2009 Leah J. Graham. All Rights Reserved. 2 This thesis titled Diamondback Terrapin, Malaclemys terrapin, Nesting and Overwintering Ecology by LEAH J. GRAHAM has been approved for the Program of Environmental Studies and the College of Arts and Sciences by Willem M. Roosenburg Associate Professor of Biological Sciences Benjamin M. Ogles Dean, College of Arts and Sciences 3 ABSTRACT GRAHAM, LEAH J., M.S., June 2009, Environmental Studies Diamondback Terrapin, Malaclemys terrapin, Nesting and Overwintering Ecology (69 pp.) Director of Thesis: Willem M. Roosenburg Poplar Island Environmental Restoration Project is a unique solution for the dredge material placement and restoring decreasing habitat in the Chesapeake Bay. Since 2002, a long-term terrapin monitoring program has been documenting diamondback terrapin, Malaclemys terrapin habitat use. Northern diamondback terrapins, hatchlings may either emerge from their nest in the fall and seek other overwintering hibernacula, or remain inside their natal nest to emerge the following spring, known as delayed emergence. Results from the 2007-08 nesting season found that compaction and the presence of ice nucleating agents (as a measure of crystallization temperature) affected nest emergence timing in hatchlings. Fall emerged nests had lower bulk density (less compacted) and had a higher potency of ice nucleating agents compared to spring emerging nests. With proper management, areas such as Poplar Island may become areas of concentration for terrapins and thus provide a source population for the terrapin recovery throughout the Bay. -
Timberlane High School Science Summer Reading Assignment
Timberlane High School Science Summer Reading Assignment: Course: Zoology Instructions Please read the following selection(s) from the book A Short History of Nearly Everything by Bill Bryson. Please provide written answers (short essay style) to the questions at the end of the reading •Questions adapted from Random House Publishing Inc. https://www.randomhouse.com/catalog/teachers_guides/9780767908184.pdf The written assignment is to be turned into your teacher by Friday Sept. 8th for potential full credit. Accepted until Sept 13th with 10% deduction in grade per day. Not accepted after Sept 13th. This is a graded assignment worth up to 3% of your quarter 1 grade. Grading Rubric: The writing will be assessed on the following 0 to 3 scales Each answer should be in a short essay style (minimum one paragraph). o 1: most answers are short one word answers. o 3: complete thoughts and sentences that fully convey the answers. Each answer should demonstrate evidence of reading to comprehension. o 1: answers indicate that the reading was not completed o 3: answers show clear comprehension of the reading Each answer should be correct, relevant to the topic, should strive for detail and completeness. o 1: answers are not relative to question or reading o 3: Answers demonstrate clear relevancy to passage and get to the heart of the rationale for question in relation to subject area. Each answer should refer to a specific statement or include a quote from the reading. o 1: the writing is vague, incomplete and contains little detail o 3: writing is detailed, complete and references specific statements or quotes from the reading passage. -
Pre-Filed Testimony of Dr. David Publicover
STATE OF MAINE LAND USE REGULATION COMMISSION TransCanada Maine Wind Development ) PRE-FILED TESTIMONY OF Development Permit DP4860 ) DR. DAVID PUBLICOVER Kibby and Chain of Ponds Townships, ) APPALACHIAN MOUNTAIN CLUB Franklin County ) I. QUALIFICATIONS My name is David Publicover. I am a Senior Staff Scientist with the Appalachian Mountain Club in Gorham, NH, where I have been employed since 1992. I have a B.S. in Forestry from the University of New Hampshire (1978), an M.S. in Botany from the University of Vermont (1986), and a D.F. in Forest Ecology from the Yale University School of Forestry and Environmental Studies (1992). My general responsibility is to provide scientific information and analyses to AMC and its partners in the areas of terrestrial ecology and natural resource conservation, sustainable forestry and land use, and land conservation planning. For most of my tenure at AMC I have been involved with wind power development and siting issues. I have served as AMC’s primary representative or expert witness during interventions in five previous commercial wind power development applications, including four before LURC (the Kenetech Boundary Mountains project in the mid-1990s and the more recent Kibby Mountain, Stetson Mountain, and Redington/Black Nubble projects) and one before New Hampshire Site Evaluation Committee. I have served on public policy working groups addressing wind power siting issues in Maine, New Hampshire and Massachusetts, most notably as an alternate member of the Governor’s Task Force on Wind power Development in Maine (2007-08). I served as an invited member of panel discussions before the Commission on December 7, 2005 (related to the consideration of wind power in the revision of the Comprehensive Land Use Plan) and December 16, 2009 (related to the standards for considering petitions to expand the expedited wind power permitting area). -
A STORY of the WASHINGTON COUNTY UNORGANIZED TERRITORIES Prepared by John Dudley for Washington County Council of Governments March 2017
A STORY OF THE WASHINGTON COUNTY UNORGANIZED TERRITORIES Prepared by John Dudley for Washington County Council of Governments March 2017 The story of the past of any place or people is a history, but this story is so brief and incomplete, I gave the title of “A Story”. Another person could have written quite a different story based on other facts. This story is based on facts collected from various sources and arranged in three ways. Scattered through one will find pictures, mostly old and mostly found in the Alexander- Crawford Historical Society files or with my families’ files. Following this introduction is a series on pictures taken by my great-grandfather, John McAdam Murchie. Next we have a text describing the past by subject. Those subjects are listed at the beginning of that section. The third section is a story told by place. The story of each of the places (32 townships, 3 plantations and a couple of organized towns) is told briefly, but separately. These stories are mostly in phrases and in chronological order. The listed landowners are very incomplete and meant only to give names to the larger picture of ownership from 1783. Maps supplement the stories. This paper is a work in progress and likely never will be complete. I have learned much through the research and writing of this story. I know that some errors must have found their way onto these pages and they are my errors. I know that this story is very incomplete. I hope correction and additions will be made. This is not my story, it is our story and I have made my words available now so they may be used in the Prospective Planning process. -
Bedrock Geology of the Grand Lake Area Aroostook, Hancock Penobscot, and Washington Counties, Maine
Bedrock Geology of the Grand Lake Area Aroostook, Hancock Penobscot, and Washington Counties, Maine GEOLOGICAL SURVEY BULLETIN 1201-E Bedrock Geology of the Grand Lake Area Aroostook, Hancock Penobscot, and Washington Counties, Maine By DAVID M. LARRABEE, CHARLES W. SPENCER, and DONALD J. P. SWIFT CONTRIBUTIONS TO GENERAL GEOLOGY GEOLOGICAL SURVEY BULLETIN 1201-E Description of the rocks and geologic structure of an area in eastern Maine UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1965 UNITED STATES DEPARTMENT OF THE INTERIOR STEWART L. UDALL, Secretary GEOLOGICAL SURVEY Thomas B» Nolan, Director For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20482 CONTENTS Page Abstract__________-__-__--_____-__-_-________________ El Introduction.______________________________________________________ 2 Geology ---.-----------.------------___----_---_-_-___-__--_____ 5 Metasedimentary and sedimentary formations__..__________________ 5 Cambrian or Ordovician, undifferentiated___________________ 5 Quartzite and colored slate____________________________ 5 Ordovician__ _ ___________________________________________ 10 Dark Argillite Division of the Charlotte Group of Alcock (1946a, b)__-________________________ 10 Black slate, metachert, and tuffaceous rocks of Snow Mountain, _________________________________________ 10 Silurian(?)_.__________________________________ 11 Kellyland Formation._________________________________ 11 Silurian_ __________________________________________________ 13 Limestone