1. Original level III lines digitized 1986
2. Updated level III and IV lines. 12/2003
3. Updated level III and IV lines as per edits to AR and LA. 3/2004
Reviews_Applied_to_Data
1. Lines and map were reviewed by multiple state and federal personnel.
2. Revised lines were reviewed by Shannen Chapman, Dynamac, Inc., c/o US EPA
3. Revisions were reviewed by Shannen Chapman, Dynamac, Inc., c/o US EPA
REFERENCES
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Overview_Description Entity_and_Attribute_Overview
Arc attributes
9 = state border
8 = coastline
4 = level 4 ecoregion boundary
3 = level 3 ecoregion boundary
Attributes: Polygon coverage- polygons identified by ecocode
ECO ECO_CODE
73 Mississippi Alluvial Plain
73a Northern Holocene Meander Belts
73b Northern Pleistocene Valley Trains
73c St. Francis Lowlands
73d Northern Backswamps
73e Grand Prairie
73f Western Lowlands Holocene Meander Belts
73g Western Lowlands Pleistocene Valley Trains
73h Arkansas/Ouachita River Holocene Meander Belts
73i Arkansas/Ouachita River Backswamps
73j Macon Ridge
73k Southern Holocene Meander Belts
73l Southern Pleistocene Valley Trains
73m Southern Backswamps
73n Inland Swamps
73o Deltaic Coastal Marshes and Barrier Islands
74 Mississippi Valley Loess Plains
74a Bluff Hills