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** The Ediacaran is the only formal system in the Proterozoic with a global boundary stratotype section and point (GSSP). A geologic time scale is composed of standard stratigraphic divisions based on rock sequences and is calibrated in years (Harland and others, 1982). Geological Survey Geologic Names Committee, 2007, Divisions of geologic time-major chronostratigraphic and geochronologic units: U. Over the years, the development of new dating methods and the refinement of previous methods have stimulated revisions to geologic time scales. Also of note, the Ediacaran is the only formal system in the Proterozoic. B., van, eds., 1998, Geological time table (5th ed.): Amsterdam, Elsevier, 1 sheet. All other units are periods until global boundary stratotype sections or points are defined. The "North American Stratigraphic Code" (North American Commission on Stratigraphic Nomenclature, 2005) recommends abbreviations for ages in SI (International System of Units) prefixes coupled with "a" for "annum": ka for kilo-annum (103 years); Ma for mega-annum (106 years); and Ga for giga-annum (109 years). The Community Development Council (CDC) is the coordinating body for the CDI national network.It is a nonprofit organization whose purpose is to establish professional standards through certification and training that will be recognized as valuable to both the community development practitioner and those who employ their services.
Trans is the fastest growing online Escort & hot new members every day !!Although the Tertiary is not recognized by many international time scales, the GNC agrees that it is important that it be recognized as a system/period; the map symbols "T" (Tertiary) and "Q" (Quaternary) have been used on geologic maps for more than a century and are widely used today. Another change to the time scale is the age of the base of the Holocene Series/Epoch. It is not a membership organization but does maintain a registry of Professional Community and Economic Developers in good standing.The CDC oversees the certification process through its board of trustees and works collaboratively with the Community Development Institutes to deliver the full range of services leading to certification.
CDC was founded in 1995 to promote the advancement of standards of competence for community development professionals through accreditation of community development educational programs, professional certification, and the development of community leaders.