page_title: Northwest Arkansas
section_title: Geology
hierarchical_section_title: Northwest Arkansas / Geography / Geology
caption_attribution_description: English: Overview of physiographic sections of the Ozarks.
context_page_description: Northwest Arkansas is a metropolitan area and region in Arkansas within the Ozark Mountains. It includes four of the ten largest cities in the state: Fayetteville, Springdale, Rogers, and Bentonville, the surrounding towns of Benton and Washington counties, and adjacent rural Madison County, Arkansas. The United States Census Bureau-defined Fayetteville–Springdale–Rogers Metropolitan Statistical Area includes 2,674 square miles and 525,032 residents, ranking NWA as the 105th most-populous metropolitan statistical area in the U.S. and the 22nd fastest growing in the United States.
  Northwest Arkansas doubled in population between 1990 and 2010. Growth has been driven by the three Fortune 500 companies based in NWA: Walmart, Tyson Foods, and J.B. Hunt Transport Services, Inc., as well as over 1,300 suppliers and vendors drawn to the region by these large businesses and NWA's business climate. The region has also seen significant investment in amenities, including the Crystal Bridges Museum of American Art, the Walmart AMP, and the NWA Razorback Regional Greenway.
context_section_description: NWA is located within the Ozark Mountains, a deeply dissected plateau within the U.S. Interior Highlands, the largest mountainous region between the Appalachians and the Rocky Mountains. Although the topography varies widely within the region, the Ozark geology is present throughout. Roughly at Fayetteville, the geology splits between the Boston Mountains to the south and the Springfield Plateau to the north. The Ouachita orogeny exposed the older limestones of the Springfield Plateau, resulting in a softer terrain, while the Boston Mountains retained steep, sharp grade changes. The Ozarks are covered by an oak-hickory-pine forest, with large portions of protected forestland remaining NWA. Approximately 25% of this forest has been cleared for development and agricultural uses.
caption: The split between the Springfield Plateau and the Boston Mountains occurs in the center of Washington County, Arkansas very near Fayetteville. The rough, mountainous terrain south of Fayetteville is the Boston Mountains while the more-habitable Springfield Plateau contains the cities of Springdale, Bentonville and Rogers to the north.
exif: {"Image ImageWidth": "800", "Image ImageLength": "668", "Image BitsPerSample": "[8, 8, 8]", "Image Compression": "Uncompressed", "Image PhotometricInterpretation": "2", "Image Orientation": "Horizontal (normal)", "Image SamplesPerPixel": "3", "Image XResolution": "72", "Image YResolution": "72", "Image PlanarConfiguration": "1", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "Adobe Photoshop CS2 Windows", "Image DateTime": "2006:12:30 16:37:08", "Image ExifOffset": "252", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "390", "Thumbnail JPEGInterchangeFormatLength": "4362", "EXIF ColorSpace": "Uncalibrated", "EXIF ExifImageWidth": "800", "EXIF ExifImageLength": "668"}