莫里遜組






The distinctive banding of the Morrison Formation, a group of rock layers that occur throughout Dinosaur National Monument and the source of fossils like those found at the Dinosaur Quarry.


莫里遜組（英语：Morrison Formation），或譯摩里山層[1]，是位於美國西部與加拿大的一系列侏儸紀晚期層積岩層。是北美洲產有最多恐龍化石的地層。組成的岩石種類包括泥岩、沙岩、沙泥岩以及石灰岩，顏色呈現淺灰色、灰綠色或紅色。大多數化石出現在綠色的沙泥岩床與其下方的沙岩，屬於侏儸紀時期的河流與氾濫平原之殘留物。


莫里遜組的中心位於美國的懷俄明與科羅拉多，突出部分位於美國的蒙大拿、北达科他、南达科他、內布拉斯加、堪薩斯，以及加拿大的薩克基萬、亞伯達。另有一些狹長部分位於奧克拉荷馬、德克薩斯、新墨西哥、亞歷桑那、猶他與愛達荷。總涵蓋面積約150萬平方公里。但是其中受考古學家挖掘研究的只有小部分。其餘超過75%的區域則有不同的現況：從大草原向東仍然是掩埋的狀態；較大的一部分則在因為西邊的落磯山脈成形而受侵蝕進而摧毀。


莫里遜組之名源自科羅拉多的莫里遜（Morrison），這理也是Arthur Lakes在1877年首先發現化石的地方。同年，此地成為奧斯尼爾·馬許和Edward Drinker Cope展開骨頭大戰（Bone Wars）的地方。


除了化石以外，莫里遜組是科羅拉多、新墨西哥與猶他三州的主要鈾礦產地。



參考資料





  1. ^ 國家教育研究院雙語詞彙、學術名詞暨辭書資訊網 互联网档案馆的存檔，存档日期2016-03-05.，國家教育研究院，2015-09-17查閱。









Comments

Post a Comment

Popular posts from this blog

Information security

Image
This article is part of a series on Information security Related security categories Internet security Cyberwarfare Computer security Mobile security Network security Threats Computer crime Vulnerability Eavesdropping Malware Spyware Ransomware Trojans Viruses Worms Rootkits Bootkits Keyloggers Screen scrapers Exploits Backdoors Logic bombs Payloads Denial of service Defenses Computer access control Application security Antivirus software Secure coding Secure by default Secure by design Secure operating systems Authentication Multi-factor authentication Authorization Data-centric security Encryption Firewall Intrusion detection system Mobile secure gateway Runtime application self-protection (RASP) v t e Information security , sometimes shortened to InfoSec , is the practice of preventing unauthorized access, use, disclosure, disruption, modification, inspection, recording or destruction of information. Th
Read more

Lambak Kiri

Image
For Lambak Kiri public housing area, see Lambak Kiri Landless Indigenous Citizens' Housing Scheme. Village in Brunei-Muara, Brunei Lambak Kiri Village Location in Brunei Coordinates: 4°59′26″N 114°57′04″E  /  4.990472°N 114.951114°E  / 4.990472; 114.951114 Coordinates: 4°59′26″N 114°57′04″E  /  4.990472°N 114.951114°E  / 4.990472; 114.951114 Country Brunei District Brunei-Muara Mukim Berakas A Government  • Village head Hamdani Omar Postcode BB1214 Lambak Kiri is a populated place in Brunei-Muara District, Brunei. It is officially a village subdivision under Berakas A, a mukim in the district. Lambak Kiri may also refer to the greater area which includes the Lambak Kiri public housing area of the Landless Indigenous Citizens' Housing Scheme (Malay: Skim Tanah Kurnia Rakyat Jati ), although the latter is a separate subdivision. Contents 1 Name 2 Administration 3 See also 4 References Name
Read more

Farm Security Administration

Image
Farm Security Administration Farm Security Administration logo Agency overview Formed September 1, 1937  ( 1937-09-01 ) Preceding agencies Resettlement Administration Federal Emergency Relief Administration Dissolved 1946 Superseding agency Farmers Home Administration Key documents Farm Security Act Bankhead-Jones Farm Tenant Act The Farm Security Administration ( FSA ) was a New Deal agency created in 1937 to combat rural poverty during the Great Depression in the United States. It succeeded the Resettlement Administration (1935–1937). [1] The FSA stressed "rural rehabilitation" efforts to improve the lifestyle of sharecroppers, tenants, very poor landowning farmers, and a program to purchase submarginal land owned by poor farmers and resettle them in group farms on land more suitable for efficient farming. Critics, including the Farm Bureau, strongly opposed the FSA as an experiment in collectivizing agriculture—that is, in bringing
Read more