! . In the county the population was distributed as 29.00% under the age of 18 10.3% from 18 to 24 33.4% from 25 to 44 19.8% from 45 to 64 and 7.4% who were 65 years of age or older the median age was 31 years for every 100 females there were 99.2 males for every 100 females age 18 and over there were 97.0 males. .
. 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!
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