Geography of Denton County Page: 35
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DENTON COUNTY AS A WHOLE
an automobile, and many other fine things. All of the
rocks in Denton County are Cretaceous rocks. Creta-
ceous is derived from a Latin word meaning chalk.
The Cretaceous rocks of Texas represent one of the
most important rock systems in the state. It might be
of interest here to mention that twenty-eight per cent
of Texas, or an area of about 75,000 square miles, con-
sists of Upper and Lower Cretaceous rocks. About
thirty-five per cent of the population of Texas is located
on the Cretaceous outcrop. Some of the best towns
and cities in Texas and some of the finest colleges are
located on the Cretaceous rocks. The older and harder
rocks in Denton County, belonging to the Lower Creta-
ceous period, are in the western half of the county
underlying the Grand Prairie. The Upper Cretaceous
rocks underlie the eastern half of the county, the Black
Prairie and the Eastern Cross Timbers. Geologists
tell us that the map of the world showing greatest hu-
man development coincides almost identically with the
map of the world's outcrop of Cretaceous rocks. Five-
explanations are given for this: first, Cretaceous lime-
stones furnish an abundant water supply; second,
Cretaceous rocks generally have a firm substratum;
third, these limestones disintegrate into very rich soil;
fourth, limestones of the Cretaceous period make good
material for the construction of roads and houses; fifth,
the erosive qualities of such limestones are sufficiently
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Cowling, Mary Jo. Geography of Denton County, book, 1936; Dallas, Tex.. (texashistory.unt.edu/ark:/67531/metapth90885/m1/50/: accessed June 26, 2017), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; crediting Denton Public Library.