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Strontium is a chemical element; it has symbol Sr and atomic number 38. An alkaline earth metal, strontium is a soft silver-white yellowish metallic element that is highly chemically reactive. The metal forms a dark oxide layer when it is exposed to air. Strontium has physical and chemical properties similar to those of its two vertical neighbors in the periodic table, calcium and barium. It occurs naturally mainly in the minerals celestine and strontianite, and is mostly mined from these.
The rubidium–strontium dating method (Rb–Sr) is a radiometric dating technique, used by scientists to determine the age of rocks and minerals from their content of specific isotopes of rubidium (87Rb) and strontium. One of the two naturally occurring isotopes of rubidium, 87Rb, decays to 87Sr with a half-life of 49.23 billion years. The radiogenic daughter, 87Sr, produced in this decay process is the only one of the four naturally occurring strontium isotopes that was not produced exclusively by stellar nucleosynthesis predating the formation of the Solar System. Over time, decay of 87Rb increases the amount of radiogenic 87Sr while the amount of other Sr isotopes remains unchanged.
Below are notable events in archaeology that occurred in 1937.
The year 2004 in archaeology included many events, some of which are listed below.
Tel Megiddo is the site of the ancient city of Megiddo, the remains of which form a tell or archaeological mound, situated in northern Israel at the western edge of the Jezreel Valley about 30 kilometres (19 mi) southeast of Haifa near the depopulated Palestinian town of Lajjun and subsequently Kibbutz Megiddo. Megiddo is known for its historical, geographical, and theological importance, especially under its Greek name Armageddon. During the Bronze Age, Megiddo was an important Canaanite city-state. During the Iron Age, it was a royal city in the Kingdom of Israel.
Chaco Culture National Historical Park is a United States National Historical Park in the American Southwest hosting a concentration of pueblos. The park is located in northwestern New Mexico, between Albuquerque and Farmington, in a remote canyon cut by the Chaco Wash. Containing the most sweeping collection of ancient ruins north of Mexico, the park preserves one of the most important pre-Columbian cultural and historical areas in the United States.
The year 1976 in archaeology involved some significant events.
Below are notable events in archaeology that occurred in 1907.
The alkaline earth metal strontium (38Sr) has four stable, naturally occurring isotopes: 84Sr (0.56%), 86Sr (9.86%), 87Sr (7.0%) and 88Sr (82.58%). Its standard atomic weight is 87.62(1).
Pueblo Bonito is the largest and best-known great house in Chaco Culture National Historical Park, northern New Mexico. It was built by the Ancestral Puebloans who occupied the structure between AD 828 and 1126.
Cowboy Wash is a group of nine archaeological sites used by Ancestral Puebloans in Montezuma County, southwestern Colorado, United States. Each site includes one to three pit houses, and was discovered in 1993 during an archaeological dig. The remains of twelve humans were found at one of the pit house sites, dating to the 12th century.
David Ussishkin is an Israeli archaeologist and professor emeritus of archaeology.
Richard Wetherill (1858–1910), a member of a Colorado ranching family, was an amateur archaeologist who discovered, researched and excavated sites associated with the Ancient Pueblo People. He is credited with the rediscovery of Cliff Palace in Mesa Verde in Colorado and was responsible for initially selecting the term Anasazi, Navajo for ancient enemies, as the name for these ancient people. He also excavated Kiet Seel ruin, now in Navajo National Monument in northeastern Arizona, and Pueblo Bonito in Chaco Canyon, New Mexico.
A timeline of Chacoan history includes Chaco Culture National Historical Park, Aztec Ruins National Monument, Twin Angels Pueblo, Casamero Pueblo, Kin Nizhoni, Pierre's Site, and Halfway House.
Megiddo church, near Tel Megiddo, Israel, is an archaeological site which preserves the foundations of one of the oldest church buildings ever discovered by archaeologists, dating to the 3rd century AD. The ‘Megiddo Church’, as the room became known, was dated to circa 230 AD on the basis of pottery, coins, and the inscriptional style. The site’s abandonment, circa 305 AD, is evident in the purposeful covering of the mosaic, and relates well to the crisis of 303 AD, when the Christian communities of Judea experienced the Diocletianic Persecution.
The Ancestral Puebloans, also known as the Anasazi and by the earlier term the Basketmaker-Pueblo culture, were an ancient Native American culture that spanned the present-day Four Corners region of the United States, comprising southeastern Utah, northeastern Arizona, northwestern New Mexico, and southwestern Colorado. They are believed to have developed, at least in part, from the Oshara tradition, which developed from the Picosa culture. The people and their archaeological culture are often referred to as Anasazi, a term introduced by Alfred V. Kidder from the Navajo word anaasází meaning 'enemy ancestors' although Kidder thought it meant 'old people'. Contemporary Puebloans object to the use of this term, with some viewing it as derogatory.
Atlatl Cave is an important archaeological site that contains organic evidence of occupation by Archaic North Americans c. 900 BCE. It is located at the west end of the Chaco Culture National Historical Park in San Juan County, New Mexico, at an elevation of 1910 meters.
Sajsi is the name of an ancient lake in the Andes
Jay Quade is an American geochemist and geologist and former middle-distance runner. He is known for pioneering research applying geochemical isotopic methods for investigations of tectonics, global climate change, and the paleontology of Darwinian evolution.
References
- ↑ "Schatten VOC-schip De Rooswijk overgedragen aan Nederland". Trouw. 2005-12-12. p. 3.
- ↑ Sherlock, Stephen J. (2011). The Anglo-Saxon Princess Exhibition Guidebook. Kirkleatham Museum.
- ↑ "The Battle of the Aegates Islands: Discovery of the Battle Zone and Major Finds". Society for Classical Studies. Retrieved 9 April 2018.
- ↑ "The Archaeology of Liberty in an American Capital". ucpress. Retrieved 9 April 2018.
- ↑ Mayor, Adrienne (2005). Fossil Legends of the First Americans. Princeton University Press. ISBN 0691113459.
- ↑ Reynolds, Amanda C.; Betancourt, Julio L.; Quade, Jay; Patchett, P. Jonathan; Dean, Jeffrey S.; Stein, John (2005). "87Sr/86Sr sourcing of ponderosa pine used in Anasazi great house construction at Chaco Canyon, New Mexico". Journal of Archaeological Science. 32 (7): 1061–1075. Bibcode:2005JArSc..32.1061R. doi:10.1016/j.jas.2005.01.016. Archived from the original on 10 April 2018. Retrieved 9 April 2018.
- ↑ Wainwright, Martin (2005-02-18). "Iron age necklace discovered". The Guardian . London. Retrieved 2018-02-28.
- ↑ "A Mystery Fit For A Pharaoh". Smithsonian. Retrieved 9 April 2018.
- ↑ Archived March 10, 2007, at the Wayback Machine
- ↑ Erlanger, Steven (5 August 2005). "King David's Palace IsFound, Archaeologist Says". The New York Times. Retrieved 9 April 2018.
- ↑ McGreal, Chris (7 November 2005). "Holy Land's 'oldest church' found at Armageddon". the Guardian. Retrieved 9 April 2018.
- ↑ Ishak, Natasha (2020-06-11). "13,500-Year-Old Bird Figurine Discovered In Pile Of Dirt Is The Oldest Sculpture Ever Found In East Asia". All That's Interesting. Retrieved 2020-06-13.
- ↑ "Golden treasure unearthed in Bulgaria". msnbc.com. 25 July 2005. Retrieved 22 November 2017.
- ↑ "Obelisk returned to Ethiopia after 68 years". the Guardian. 20 April 2005. Retrieved 22 November 2017.
- ↑ "Minnetale over dr. philos Anders Hagen". The Norwegian Academy of Science and Letters (in Norwegian). Archived from the original on 22 December 2017. Retrieved 19 December 2017.
- ↑ Quinnell, Henrietta (20 January 2006). "Obituary: Aileen Fox". The Guardian. Retrieved 15 March 2017.