. . . . Houston is home to various styles of residential architecture from the mansions of River Oaks and Memorial to row houses in the several wards a number of Houston's earliest homes are now located in Sam Houston Park including the Kellum-Noble House which was built in 1847 and is Houston's oldest brick dwelling. During the late 1930s and early 1940s the Kellum-Noble House served as a public office for the City of Houston's Park Department and is listed in the National Register of Historic Places. These Precambrian igneous and metamorphic rocks underlie most of the state and are exposed in three places: Llano uplift Van Horn and the Franklin Mountains near El Paso Sedimentary rocks overlay most of these ancient rocks the oldest sediments were deposited on the flanks of a rifted continental margin or passive margin that developed during Cambrian time, Main article: Demographics of Texas The original city council line-up of 14 members (nine district-based and five at-large positions) was based on a U.S Justice Department mandate which took effect in 1979. At-large council members represent the entire city. Under the city charter once the population in the city limits exceeded 2.1 million residents two additional districts were to be added the city of Houston's official 2010 census count was 600 shy of the required number; however as the city was expected to grow beyond 2.1 million shortly thereafter the two additional districts were added for and the positions filled during the August 2011 elections.
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