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 * style="height:100px; width:60%; text-align:left;" |Use the links below to navigate the content about the Commission and its activities.

The Story of NACSN
The North American Commission on Stratigraphic Nomenclature, charged with the goal of promoting common standards in stratigraphic nomenclature and practice throughout North America, celebrated its 70th anniversary in December, 2016. Originally named the American Commission on Stratigraphic Nomenclature, the Commission was later expanded to include representatives from the major geological organizations in Canada and Mexico, with the goal of promoting uniformity in stratigraphic nomenclature throughout North America.

The roots of this organization go back to the 1930s, when a small group of geologists, concerned with the lack of uniformity in stratigraphic terminology and application of stratigraphic principles in different regions and professional sectors across the nation, set up a self-appointed Committee on Stratigraphic Nomenclature, and began the task of formulating guidelines that would be both useful and consistent. The resulting "Classification and Nomenclature of Rock Units," were published in the Bulletin of the Geological Society of America in 1933 (G.H. Ashley et al., vol. 44, pp. 423-459 ).

In 1941, R.C. Moore proposed that representatives from the Association of American State Geologists, American Association of Petroleum Geologists, Geological Society of America, U.S. Geological Survey and Geological Survey of Canada should form a permanent body to oversee standard stratigraphic practices. Following World War II, Moore revived discussion among the same groups, and In 1946, the American Commission on Stratigraphic Nomenclature became a reality with Moore as inaugural chairman and M.G. Cheney as vice-chairman. The Commission was later expanded to include representatives from other major geological organizations in Canada and Mexico, and changed its name to reflect its present pan-continental scope.

The Commission is a member society of the American Geosciences Institute.

Mission
The purposes of the Commission are to
 * develop statements of stratigraphic principles
 * recommend procedures applicable to classification and nomenclature of stratigraphic and related units
 * review problems in classifying and naming stratigraphic and related units and
 * formulate expressions of judgment on these matters.

Commissioner Membership
Representatives serve three years, with staggered terms. Chairman and Vice-Chairman are elected from within the Commission membership, and each serves one year. Most members of the Commission are representatives of the fields of paleontology, biostratigraphy and stratigraphy.

Six representatives each from:
Commissioners at Large

Four representatives each from:
The Geological Society of America

Three representatives each from:
American Association of Petroleum Geologists Association of American State Geologists Geological Association of Canada Geological Survey of Canada United States Geological Survey

Two representatives each from:
Canadian Society of Petroleum Geologists Society for Sedimentary Geology

One representative each from:
Asociación Mexicana de Geólogos Petroleros Instituto de Geología, Universidad Nacional Autónoma de México Ciudad Servicio Geológico Mexicano Sociedad Geológica Mexicana

North American Stratigraphic Code
Below is the current North American Stratigraphic Code as published in the AAPG Bulletin, November 2005. Current code in English as html https://ngmdb.usgs.gov/Info/NACSN/Code2/code2.html The code from 2010 in Spanish courtesy of the Instituto de Geologia de Mexico https://nacsn.americangeosciences.org/sites/default/files//2018-01/Codigo%20Estratigrafico%20Norteamericano.pdf

The Commission’s chief publication is the North American Stratigraphic Code, or simply, the Code, with the current version dating to 2005. The Code serves as a guide to all stratigraphic practices throughout North America and is foremost among the regional codes that influenced the nature, content, and stratigraphic philosophy of the International Stratigraphic Guide. Although all changes to the Code are finalized by the Commission, the terms of Article 21 allow any geoscientist to submit proposals for changes or additions. Feel free to do so at our Contact us form.

The Commission is continually updating the 2005 Code in response to new developments, with occasional revisions to entire sections. A recently completed program to improve the clarity of the Code included a complete revision of the "On Biostratigraphic Units" section. Discussions for emending the "Hydrostratigraphic Units" section is in progress and extensive discussions are planned on the relationship between "Allostratigraphy" and "Sequence Stratigraphy" - including whether there should be a separate "Sequence Stratigraphy Units" section.

To better serve the North American community, the Instituto de Geologia de Mexico published the Code in Spanish in 2010.

NACSN Notes have been a staple of the Commission since its inception. They cover any NACSN related topics, such as changes in nomenclature, meeting minutes, and other news.

Most Commission reports and notes have been published courtesy of the Bulletin of the American Association of Petroleum Geologists, including Notes submitted at irregular intervals - ranging from Note 1 to the most recent Note 66. At this time, the Journal of Stratigraphy is the offical publication venue for NACSN publications.

Meetings
The Commission meets once a year in conjunction with the annual meeting of the Geological Society of America and are open to the public. The 77th Annual Meeting was held Monday, October 10, 2022 from 13:00 to 16:00, Quartz B, Hyatt Regency Denver at the Colorado Convention Center with remote participants NACSN Bylaws Commission Archives

77th Annual Meeting
Monday, October 10, 2022 - 13:00 Quartz B (Hyatt Regency Denver at Colorado Convention Center)

76th Annual Meeting
October 5, 2021 remotely held

75th Annual Meeting
October 26-30, 2020 remotely held

74th Annual Meeting
September 22-25, 2019 Phoenix, Arizona

73rd Annual Meeting
Monday, November 5, 2018 - 13:00 White River Ballroom C, Indianapolis Marriott

72nd Annual Meeting
Monday, October 23, 2017 - 13:00 Sheraton Seattle Hotel, Ballard Room, Seattle, Washington

71st Annual Meeting
Monday, September 26, 2016 - 13:35 Hyatt Regency Hotel, Mineral Hall G, Denver, CO

70th Annual Meeting
Monday, November 2, 2015 - 13:10 Baltimore Hilton Hotel, Latrobe Room, Baltimore, Maryland

69th Annual Meeting
Monday, October 20, 2014 - 13:00 Hyatt Regency Hotel, Vancouver, British Columbia

68th Annual Meeting
Monday, October 28, 2013 - 13:06 Hyatt Regency Hotel, Denver, Colorado

67th Annual Meeting
Monday, November 5, 2012 - 13:00 Independence Room, Westin Hotel, Charlotte, North Carolina

66th Annual Meeting
Thursday, November 10, 2011 - 13:00 Minneapolis, Minnesota

65th Annual Meeting
Monday, November 1, 2010 - 13:00 Denver Hyatt Regency Hotel, Capitol Ballroom 3, Denver, Colorado

64th Annual Meeting
Monday, October 19, 2009 - 13:00 Portland Hilton, Galleria North, Portland, Oregon

63rd Annual Meeting
Monday, October 6, 2008 - 13:00 Hilton-Americas, Room 339AB, Houston, Texas

62nd Annual Meeting
Monday, October 29, 2007 - 13:00 Hyatt Regency at Colorado Convention Center, Mineral Hall D, Denver, Colorado

61st Annual Meeting
Monday, October 23, 2006 - 13:00 Philadelphia, Pennsylvania

60th Annual Meeting
Monday, October 17, 2005 - 13:00 Marriott Downtown Hotel, Solitude Room, Salt Lake City, Utah

59th Annual Meeting
Sunday, November 7, 2004 - 13:00 Denver, Colorado

58th Annual Meeting
Sunday, November 2, 2003 - 13:00 Douglas Room, Sheraton Hotel, Seattle Washington

57th Annual Meeting
Sunday, October 27, 2002 - 13:00 Hyatt Hotel, Far East Room, Denver, Colorado

56th Annual Meeting
Monday, November 5, 2001 - 13:00 Sheraton Boston, Berkeley Room, Boston, Massachusetts

55th Annual Meeting
Monday, November 13, 2000 - 13:30 Reno Hilton Hotel, Room N8, Reno, Nevada