holocene Clovis culture impact disaster? expert Vance T Holliday talk 5:30 pm Monday Feb 1 $ 12 at Hotel Santa Fe, Paseo de Peralta at Cerrillos Road -- many impact air bursts near Odessa crater: Rich Murray 2010.02.01 http://rmforall.blogspot.com/2010_02_01_archive.htm Monday, February 1, 2010 http://groups.yahoo.com/group/astrodeep/message/39 _____________________________________________________
[ Note: Third Meteor Night, 7 pm Tuesday Feb 2, SF Complex ] http://www.southwestseminars.org/SouthwestSeminars.org/Ancient_Sites_2010.html 466-2775 http://www.argonaut.arizona.edu/holliday.htm http://www.argonaut.arizona.edu/history.htm http://www.sott.net/articles/show/198948-Absence-of-Evidence-for-a-Meteorite-Impact-Event-13-000-Years-Ago http://www.pnas.org/content/106/51/21505 free full text François S. Paquay, Greg Ravizza, Steven Goderis, Philippe Claeys, Steven Goderis, Frank Vanhaeck, Matthew Boyd, Todd A. Surovell, Vance T. Holliday, C. Vance Haynes, Jr. "Absence of geochemical evidence for an impact event at the Bolling - Allerod/Younger Dryas transition." Proceedings of the National Academy of Sciences, 2009 presented at the American Geophysical Union Fall 2009 Meeting in San Francisco. Wednesday December 16th, 2:52 PM -- 3:04 PM, Room 2006 Moscone West Just now, on Google Earth I found: 31.7126 -102.5230 .933 km el SW of Odessa crater many small shallow white and dark craters nearby 31.5932 -102.4573 .837 km el 15 km field of white deposits in oil field -- near surface Holocene air bursts of ice comet fragments? 31.2119 -102.3476 .722 km el 25 km size air burst? 31.3667 -102.6734 .731 km el 7 km air burst? 31.4865 -102.6612 .777 km el 5 km air burst? South end of a long string of many large fields 31.6338 -102.8652 .826 km el 31.9087 -102.9922 .900 km el http://en.wikipedia.org/wiki/Odessa_Meteor_Crater The Odessa Meteor Crater is a meteorite crater in the southwestern part of Ector County, southwest of the city of Odessa, Texas, United States. It is located approximately 3 miles (5 km) south of I-20 at FM 1936 south.[1] This is one of two impact crater sites found in Texas, the other being the much larger and older Sierra Madera crater. The Handbook of Texas Online describes the Odessa meteor crater as the largest of several smaller craters in the immediate area that were formed by the impact of thousands of octahedrites (an iron metallic type) that fell in prehistoric times.[2] The web site of the University of Texas of the Permian Basin (UTPB, Center for Energy and Economic Diversification [CEED]), identifies five craters at the Odessa site and shows a distribution map of the meteorite fragments recovered from the area.[3] The recoveries have generally come from an area to the north and northwest of the main crater site, with only a few found to the south. They indicate that the structure of the main crater, because it was one of the earliest to be recognized and studied, is now used to name similar impact sites on a worldwide basis. Over 1500 meteorites have been recovered from the surrounding area over the years, the largest of which weighed approximately 300 pounds (135 kg), but excavations in the main crater confirm that there is no meteorite mass underground and probably never has been. The site has been designated as a National Natural Landmark by the National Park Service, and a small information area and nature trail has been set up on-site for a self-guided tour. It is 168 meters (~550 feet) in diameter and the age is estimated to be around 63,500 years (Pleistocene or younger).[4] The crater is exposed to the surface, and was originally about 100 feet (30 meters) deep. Due to subsequent infilling by soil and debris, the crater is currently 15 feet (5 meters) deep at its lowest point, which provides enough relief to be visible over the surrounding plains, but does not offer the dramatic relief found at the more famous Meteor Crater in Arizona. Still, the site offers an excellent opportunity to view a relatively uncommon impact feature close to a major transportation artery near a major city. References 1. "Odessa". Earth Impact Database. University of New Brunswick. Retrieved 2008-12-30. http://en.wikipedia.org/wiki/Earth_Impact_Database 2. Smith, Julia Cauble. "Meteor crater at Odessa". Handbook of Texas Online. Retrieved 5 November 2009. http://www.tshaonline.org/handbook/online/articles/MM/rym1.html http://www.lpi.usra.edu/meetings/lpsc2006/pdf/2372.pdf 3. Anonymous. "Meteor Impact Structures". Center for Energy & Economic Diversification, The University of Texas of the Permian Basin. Retrieved 5 November 2009. http://ceed.utpb.edu/geology-resources/west-texas-geology/meteor-impact-structures/ 4. Holliday, V.T., Kring, D.A., Mayer, J.H. and Goble, R.J. 2005. Age and effects of the Odessa meteorite impact, western Texas, USA. Geology 33(12):945-948. http://www.netwest.com/virtdomains/meteorcrater/history.htm "The shower was composed of many thousands of individual meteorites of various sizes which fell over an area of about 2 square miles. The smaller meteorites, which were by far the most numerous, either came to rest on the earth's surface or at the bottom of shallow impact pits within the soil. There were several very large meteoric masses in the shower, however, and these struck the earth with such enormous energy that they penetrated deeply into bedrock producing craters in the earth at the places of impact. When freshly formed, the craters were funnel-shaped depressions, the largest about 550 feet in diameter and 100 feet in depth. More than 100,000 cubic yards of crashed rock as ejected from this crater by the energy released from the impacting meteoric mass. [ about a cube of 300 m on each edge ] Smaller craters in the vicinity of the main crater range form 15 feet to 70 feet in diameter and from 7 feet to 18 feet in depth. In the ages following their formation the craters gradually accumulated sediments deposited by wind and water. The main crater was eventually filled to within 6 feet of the level of the surrounding plain. It now appears a shallow, nearly circular depression surrounded by a low, rock-buttressed rim. The several smaller associated craters were so completely buried that their existence was not suspected until they were exploded in excavations made by the University of Texas, in the early 1940's." http://en.wikipedia.org/wiki/Impact_Field_Studies_Group http://en.wikipedia.org/wiki/Earth_Impact_Database Suspected Earth Impact Sites (SEIS) ...the Suspected Earth Impact Sites database has been updated, expanded, renamed and relocated. The main changes/additions include: -- new name: Impact database v.2009.1 -- new location and website design: http://impacts.rajmon.cz http://astrobiology.nasa.gov/nai/library-of-resources/annual-reports/2006/uh/projects/terrestrial-analog-study-sierra-madera-impact-structure-texas/ Terrestrial analog study: Sierra Madera impact structure, Texas Project Investigators: Karen Stockstill 30.6 N 102.9 W Other Project Members F. Scott Anderson (Co-Investigator) Victoria Hamilton (Collaborator) Astrobiology Roadmap Objectives: Objective 1: Determine whether the atmosphere of the early Earth, hydrothermal or exogenous matter were significant sources of organic matter. Objective 4: Expand and interpret the genomic database of a select group of key microorganisms in order to reveal the history and dynamics of evolution. Project Progress Sierra Madera impact crater is 12 km in diameter (Fig. 1) and is a well-exposed remnant of a complex impact crater, which contains impact-generated breccias (disrupted rock with sharp-angled fragments cemented in a fine matrix) and shatter cones (a cone-shaped fracture pattern found in rocks that have been exposed to a sudden release of energy, such as an impact) (Wilshire et al., 1972; Huson, 2006). Marine carbonates and lesser amounts of interbedded siliciclastic rocks were impacted, making Sierra Madera an ideal place to study the effects of shock metamorphism in carbonates and sedimentary rocks (Huson, 2006). Understanding how impact-induced shock affects the thermal infrared spectrum is very relevant to thermal infrared studies of Mars (e.g., Stockstill et al., 2005), where impact cratering has been an important process in re-working the surface materials (Strom et al., 1992). Samples exhibiting impact deformation features were collected from the central peak area of Sierra Madera (Fig. 2), including monolithic breccias, mixed breccias and shatter cones. In addition, carbonate rocks were collected from one of the rim locations in order to compare carbonates that have experienced variable degrees of shock deformation and its effect on the thermal infrared spectrum. Thermal emissions spectra of these samples will be collected to evaluate the effect of impacts on the spectral absorptions seen in the thermal IR. Figure 1. Digital Elevation Model (DEM) of Sierra Madera impact structure showing central uplift and approximate location of the raised rim (red outline). DEM compiled by Matthews from four 7.5' quadrangles (CEED image, Texas) and acquired from the Earth Impact Database http://www.unb.ca/passc/ImpactDatabase/images/sierra-madera.htm Figure 2. Photograph of Sierra Madera central peak taken from a road cut through the NE crater rim. Samples of impact-generated breccias and shatter cones were collected from the central peak. Samples of the crater rim were collected from another rim location. Name Impact Field Studies Group annual field trip Dates March 11, 2006 - March 12, 2006 Location 30.6 N 102.9 W Description Sample collection of impact-derived breccias and shatter cones. _____________________________________________________ third Meteor Night, 7 pm Tuesday Feb 2, SF Complex -- soon I will show Tim McElvain 3 sites in La Tierra-Las Dos subdivision, Santa Fe, NM -- my samples show intense blast effects with surface melting and mineral coatings: Rich Murray 2010.01.28 http://rmforall.blogspot.com/2010_01_01_archive.htm Thursday, January 28, 2010 http://groups.yahoo.com/group/astrodeep/message/38 large dense fractal meteor cluster in Alaska? also 21 pages re unusual 0.6 m rock in Palmer: Horace Heffner: Rich Murray 2010.01.24 http://rmforall.blogspot.com/2010_01_01_archive.htm Sunday, January 24, 2010 http://groups.yahoo.com/group/astrodeep/message/37 Meteor Night 7 pm tonight, Santa Fe Complex, Santa Fe, Jan 19, Rich Murray with 10x12 screen on two extensive websites by Dennis Cox and by Tim McElvain: Rich Murray 2010.01.19 http://rmforall.blogspot.com/2010_01_01_archive.htm Tuesday, January 19, 2010 http://groups.yahoo.com/group/astrodeep/message/36 http://sites.google.com/site/dragonstormproject/ Dennis Cox, Fresno, California http://www.impactstructure.net/working-hypothesis.html Thornton H. "Tim" McElvain, Santa Fe, New Mexico awesome evidence (Google Earth images, stereo pairs, some videos) from Mexico to Canada for 500 km comet rubble pile air impacts 12950 BP -- Dennis Cox: Rich Murray 2010.01.13 http://rmforall.blogspot.com/2010_01_01_archive.htm Wednesday, January 13, 2010 http://groups.yahoo.com/group/astrodeep/message/35 exact Carolina Bay crater locations, RB Firestone, A West, et al, two YD reviews, 2008 June, 2009 Nov, also 3 upcoming abstracts: Rich Murray 2009.11.14 http://rmforall.blogspot.com/2009_11_01_archive.htm Saturday, November 14, 2009 http://groups.yahoo.com/group/astrodeep/message/31 Rich Murray, MA Boston University Graduate School 1967 psychology, BS MIT 1964, history and physics, 1943 Otowi Road, Santa Fe, New Mexico 87505 505-501-2298 rmfor...@comcast.net http://groups.yahoo.com/group/AstroDeep/messages http://RMForAll.blogspot.com new primary archive http://groups.yahoo.com/group/aspartameNM/messages group with 142 members, 1,588 posts in a public archive http://groups.yahoo.com/group/rmforall/messages participant, Santa Fe Complex www.sfcomplex.org _____________________________________________________
