The actual impact site has not yet been significantly documented—even its precise diameter and its internal structural features are not yet clear enough to make speculations on the mass and trajectory genuinely useful. A larger diameter is proposed in Andrew et al., 2015. Insufficient detail does not permit a precise reconstruction of the Devonian paleogeography, beyond the fact that it was a "wet-target" impact in a reef front where carbonates were being built up in marine shallows. Abstracts of the 35th Lunar and Planetary Science Conference. 5, p. 265. https://gsa.confex.com/gsa/2004AM/webprogram/Paper73382.html, Morrow J. R., Sandberg C. A., Harris A. G. (2005) Late Devonian Alamo Impact, southern Nevada, USA: Evidence of size, marine site, and widespread effects, Geological Society of America Special Paper 384, p. 259-280. doi: 10.1130/0-8137-2384-1.259, http://specialpapers.gsapubs.org/content/384/259.abstract. 31-57. Journal of the Idaho Academy of Science, Volume 49, Issue 1, p. 59. Geological Society of America Abstracts with Programs, Volume 23, No. The Alamo bolide impact occurred 377-378 million years ago,[1] when one or more hypervelocity objects from space slammed into shallow marine waters at a site that is now the Devonian Guilmette Formation of the Worthington Mountains and Schell Creek Range of southeastern Nevada; the event is named for breccias of metamorphosed crushed rock deposits, found as far as the town of Alamo, Nevada (the "Alamo Breccia"). A larger diameter is proposed in Andrew et al., 2015. Distribution and characteristics of multi-sourced shock-metamorphosed quartz grains, Late Devonian Alamo Impact, Nevada. The "tectonic overprint", the subsequent geologic modifications since the event, have distorted the picture; the distribution of the breccia has been compressed and skewed by west-to-east thrust faults across the area. (1995) The catastrophic Alamo breccia of southern Nevada: Record of a Late Devonian extraterrestrial impact. Come see and feel the surface of this incredible piece of history! 6, p. 379, https://gsa.confex.com/gsa/2008AM/webprogram/Paper150477.html, Myers R. (2011) Evaluating the controls on deposition of Devonian the Upper Alamo Breccia and overlying strata, Timpahute Range, Nevada. Sandberg C. A., Morrow J. R. (1998) Role of conodonts in deciphering and dating Late Devonian Alamo Impact Megabreccia, southeastern Nevada, USA, in Bagnoli G., ed., Seventh International Conodont Symposium, Europe (ECOS VII), Bologna-Modena, Italy, Abstracts Volume, p. 93-94. http://adsabs.harvard.edu/abs/2013AGUFMPP33B1927S, Sim M. S., Ono S., Hurtgen M. T. (2015) Sulfur isotope evidence for low and fluctuating sulfate levels in the Late Devonian ocean and the potential link with the mass extinction event. Geological Society of America 2009 Portland Annual Meeting, GSA Abstracts with Programs, Volume 41, No. Morrow J. R., Sandberg C. A. 7, p. 403. https://gsa.confex.com/gsa/2006AM/webprogram/Paper112082.html, Tapanila L., Anderson J. R. (2007) Survey of ichnological response following the Late Devonian Alamo impact event, southeastern Nevada (abstract). Geological Society of America 2012 Annual Meeting. 5, p.173, https://gsa.confex.com/gsa/2010AM/webprogram/Paper177455.html. 6, p. 1205, https://gsa.confex.com/gsa/2001AM/webprogram/Paper24721.html. (2001) Distribution and characteristics of multi-sourced shock-metamorphosed quartz grains, Late Devonian Alamo impact, Nevada (abstract #1233). (2003) Disturbed beds in Lower Frasnian black shales of Tennessee and Kentucky: their possible connection to impacts (abstract). (2003) Late Devonian Alamo impact, Nevada, USA; Multiple evidence of an off-platform marine impact(abstract #4055). 1, p. 27. 7, p. 535, https://gsa.confex.com/gsa/2012AM/webprogram/Paper211869.html, Sheffield J. W., Tapanila L., Ames D. P. (2010) GIS modeling of the detachment and collapse of a carbonate platform following the Late Devonian Alamo impact event, Lincoln County, Nevada (abstract). Geological Society of America 2010 Annual Meeting and Exhibition, GSA Abstracts with Programs, Volume 42, No. Much of the western and central portion of the structure are reported as having been largely destroyed by post-Devonian faulting, volcanism, and orogenic events. Complex craters, like the Alamo Impact crater, are associated with large bolide impacts in a marine setting. 5, p. 265. https://gsa.confex.com/gsa/2004AM/webprogram/Paper75766.html. ISBN 978-3-510-61350-2, https://www.schweizerbart.de/publications/detail/isbn/9783510613502/CFS_Courier_Forschungsinstitut_Senckenbe#t3465. Morrow J. R., Sandberg C. A., Ziegler W. (1999) Recognition of mid-Frasnian (early Late Devonian) oceanic impacts: Alamo, Nevada, USA, and Amönau, Hessen, Germany, in Gersonde R., and Deutsch A., eds., Oceanic Impacts: Mechanisms and Environmental Perturbations: Berichte zur Polarforschung 343, Bremerhaven, Germany, pp. http://geology.isu.edu/thesis/Retzler.Andrew.2013.pdf, Retzler A. J., Tapanila L., Steenberg J. R., Johnson C. J., Myers R. A. The findings, published Jan. 14 in the journal Geosphere, offer the most comprehensive view yet of the Alamo crater, the most accessible impact crater in North America. http://www.cedarstrat.com/docs/akc-dissertation.pdf? What to see in Arizona unusual and particular: Meteor Crater National Landmark, the visit. (2006) Onshore record of marine impact-generated tsunami, 382 Ma Alamo Event, Nevada and Utah, USA (abstract). Abstracts of the 40th Lunar and Planetary Science Conference. Meteor Crater Meteor Crater Meteor Crater Meteor Crater Crater Rim Tour Crater Rim Tour Crater Rim Tour Holsinger Meteorite Basket Meteorite Apollo Test Capsule Les San Francisco Mountains, au pied de Flagstaff, vues depuis le bord de Meteor Crater Ackman B. W. (1991) Stratigraphy of the Guilmette Formation, Worthington Mountains and Schell Creek Range, southeastern Nevada. 2008 Joint Meeting of The Geological Society of America, Soil Science Society of America, American Society of Agronomy, Crop Science Society of America, Gulf Coast Association of Geological Societies with the Gulf Coast Section of SEPM, GSA Abstracts with Programs, Volume 40, No. Abstracts of the New Developments Regarding the KT Event and Other Catastrophes in Earth History conference, Lunar and Planetary Institute and the University of Houston. 517. Abstracts of the 36th Lunar and Planetary Science Conference. Retzler A. J. http://www.geotimes.org/jan04/feature_Alamo.html. Newly reported. Abstracts of the Catastrophic Events and Mass Extinctions: Impacts and Beyond conference, Vienna, July 9-12, 2000. http://www.lpi.usra.edu/meetings/impact2000/pdf/3069.pdf. Meteor Crater one year, Alamo Breccia another with a couple other favorite areas for a couple years in between. (2009) California or bust: recognition and significance of Late Devonian Alamo impact deposit near Death Valley (abstract). 321-369. Springer-Verlag Berlin Heidelberg, ISBN 978-3-540-88261-9, ISBN 978-3-540-88262-6 doi: 10.1007/978-3-540-88262-6, http://link.springer.com/book/10.1007/978-3-540-88262-6, Harris R. S., Morrow J. R. (2007) Possible origin of enigmatic hematite inclusions in shocked quartz from the Late Devonian Alamo impact breccia (abstract). A 4000-foot wide crater all that is left of the meteor which struck the earth 50,000 years ago. The impact origin of each location listed on this website has been supported by unambiguous diagnostic evidence of hypervelocity impact that has been reported in a scientific (usually peer reviewed) context. A portion of preserved crater rim is discussed in Pinto and Warme, 2007. 31-57. 187-207. In: Evans KR, Horton JW Jr, King DT Jr, Morrow JR (eds) The sedimentary record of meteorite impacts. Geological Society of America 2006 Philadelphia Annual Meeting, GSA Abstracts with Programs. Sur place, on a le choix entre faire une visite seule et apprécier la vision panoramique du site, ou se rendre au bord du cratère accompagné d’un guide. 7, p. 532. https://gsa.confex.com/gsa/2009AM/webprogram/Paper161385.html. 681–702. Racki G. (2012) The Alvarez impact theory of mass extinction; limits to its applicability and the “great expectations syndrome”. Geological Society of America 2003 Seattle Annual Meeting, GSA Abstracts with Programs, Volume 35, No. (2009) Mapping the post-impact surface of the Late Devonian Alamo event, Nevada (abstract). Geological Society of America 2004 Denver Annual Meeting, GSA Abstracts with Programs, Volume 36, No. American Geophysical Union, Fall Meeting. A movie, “IMPACT, The Mystery of Meteor Crater” plays at regular intervals in their Big Screen Theater. 6, p.311, https://gsa.confex.com/gsa/2007AM/webprogram/Paper132224.html, Hutchins K. L., Morrow J., Sandberg C. A., Harris R. S. (2010) Proximal to distal grain-size trends in hematite inclusion-rich quartz, Late Devonian Alamo impact event ,Nevada, Utah, and California (abstract). Acta Palaeuntulugica Polonica, Volume 57, No. 99-137. doi: 10.1130/2008.2437(07), http://specialpapers.gsapubs.org/content/437/99.abstract, Poole F. G., Sandberg C. A. Geological Society of America 2010 Annual Meeting and Exhibition, GSA Abstracts with Programs. DOI: 10.1130/GES00134.1, http://geosphere.geoscienceworld.org/content/4/2/445. doi: 10.1130/0-8137-2356-6.489, http://specialpapers.gsapubs.org/content/356/489.abstract. They are larger in diameter and shallower in depth compared to simple craters. Warme J. E. (1994) Catastrophic Alamo Breccia, Upper Devonian, Southeastern Nevada (abstract). Il faut rappeler qu’à cette époque, le Texas appartenait encore au tout jeune État mexicain.. Geological Society of America 2013 Annual Meeting in Denver: 125th Anniversary of GSA, GSA Abstracts with Programs, Volume 45, No. Geological Society of America 2009 Portland Annual Meeting, GSA Abstracts with Programs, Volume 41, No. Ormö J., Martinez-Frias J., Diaz-Martinez E., Lepinette-Malvitte A., Lindström M., CLAEX team (2004) Experiments with explosives and ordnance disposal devices for the simulation of specific processes during shallow-marine impacts (abstract #1276). 2000-2001 American Association of Petroleum Geologists (AAPG) Distinguished Lectures, http://www.searchanddiscovery.com/abstracts/html/2000/DL/abstracts/1877_11.htm. Palaeogeography, Palaeoclimatology, Palaeoecology, Volume 176, Issues 1-4, Pages 47–58. All rights reserved. (2008) Devonian carbonate platform of eastern Nevada; facies, surfaces, cycles,sequences, reefs, and cataclysmic Alamo impact breccias. (2008) Evolution of Devonian carbonate-shelf margin, Nevada. Warme J. E., Chamberlain A. K. (2000) Primary ejecta, tsunami reworking, tectonic dismemberment: reconstructing the Late Devonian Alamo breccia and crater, Nevada (abstract #3069). It left a crater and a scattering of meteorite debris on each side and on the south side of the impact site. International Geology Review, Volume 40, Issue 3, pp. At the time of impact, the Alamo crater was about 120 miles (200 km) west of its current location, said Charlie Sandberg, an emeritus geologist with the U.S. Geological Survey in … 1, p. 123-143.? A., Warme J. E. (2007) Alamo Event, Nevada: Crater stratigraphy and impact breccia Realms, in Evans K. R., Horton J. W. Jr., King D. T. Jr., Morrow J. R. The increased impact force creates steep crater walls that collapse downward along normal faults, decreasing the depth and pushing up the center to form a central uplift. Geological Society of America 2012 Annual Meeting and Exposition, GSA Abstracts with Programs, Volume 44, No. on Devonian Stratigraphy SDS, Courier Forschungsinstitut Senckenberg, Volume 242, pp. Try pasting the link shown into a search engine or searching for the article authors, title, or other reference information. http://www.lpi.usra.edu/meetings/lmi2008/pdf/3038.pdf, Warme J. E., Morrow J. R., Pinto J. Yarmonto (1992) Sedimentologic and stratigraphic setting of a Devonian carbonate breccia, Northern Pahranagat Range Nevada, Master’s Thesis, Colorado School of Mines, Golden, Colorado. Master’s Thesis, Colorado School of Mines, Golden, Colorado. Facies, Volume 60, Issue 2, pp. Vol. ), The Sedimentary Record of Meteorite Impacts: Geological Society of America Special Paper 437, pp. 5, p. 313, https://gsa.confex.com/gsa/2004AM/webprogram/Paper76688.html. The trip up north is about a 2-3 hour drive and we will have the same van service that we are using on our Mirror Lab trip for about the same price or people could car pool on their own. Abstracts of the 32nd Lunar and Planetary Science Conference, http://www.lpi.usra.edu/meetings/lpsc2001/pdf/1233.pdf, Morrow J. R., Sandberg C. A. Dulin S. A. Stock C. W., Sandberg C. A. Abstracts of the 37th Lunar and Planetary Science Conference. J.A. Impact craters as indicators for planetary environmental evolution and astrobiology, Östersund, Sweden, conference Abstracts volume, p. 2. Geological Society of America 2013 Annual Meeting, GSA Abstracts with Programs, Volume 45, No. 5, p. 171, https://gsa.confex.com/gsa/2010AM/webprogram/Paper176354.html, McGhee G. R. Jr. (2001) The ‘multiple impacts hypothesis’ for mass extinction: a comparison of the Late Devonian and the late Eocene. Warme J. E., Morgan M., Kuehner H.-C. (2002) Impact-generated carbonate accretionary lapilli in the Late Devonian Alamo Breccia, http://specialpapers.gsapubs.org/content/356/489.abstract. 6, p. 543, https://gsa.confex.com/gsa/2002AM/webprogram/Paper42158.html. Journal of the British Interplanetary Society, Volume 51, No. DOI:10.1080/00206819809465206, http://www.tandfonline.com/doi/abs/10.1080/00206819809465206, Warme J. E., Morgan M., Kuehner H.-C. (2002) Impact-generated carbonate accretionary lapilli in the Late Devonian Alamo Breccia, in Koeberl C., and MacLeod K. G., eds., Catastrophic Events and Mass Extinctions: Impacts and Beyond: Boulder, Colorado, Geological Society of America Special Papers, Volume 356, pp. PhD Dissertation, Colorado School of Mines, Golden CO, 345 pages. 7, p. 277. https://gsa.confex.com/gsa/2012AM/webprogram/Paper213418.html, Retzler A., Tapanila L. (2012) Transect through post-impact sediments deposited in the outer rim and annular trough of the Alamo impact crater, Nevada (abstract). This is a likely small meteorite crater located south of Boy Scout Mountain in the Capitan mountains. Meteor Crater Panorama On our way, East across Arizona and only 6 miles from the Interstate lies the best-preserved confirmed meteorite strikes in the world. Shocked quartz in the Alamo breccia, southern Nevada: Evidence for a Devonian impact event Geology, November, 1995, v. 23, p. 1003-1006, http://geology.gsapubs.org/content/23/11/1003.full.pdf+html, http://www.lpi.usra.edu/meetings/lpsc2001/pdf/1233.pdf, Planar deformation features are also reported and indexed to estimate shock pressure on page 497 in, Warme J. E., Morgan M., Kuehner H.-C. (2002) Impact-generated carbonate accretionary lapilli in the Late Devonian Alamo Breccia, in Koeberl, C., and MacLeod, K.G., eds., Catastrophic Events and Mass Extinctions: Impacts and Beyond: Boulder, Colorado, Geological Society of America Special Paper 356, p. 489–504., http://specialpapers.gsapubs.org/content/356/489.abstract.
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