Geography of Denton County Page: 73
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by crowds on camps and picnics. It is a sandstone knob
of about 900 feet altitude. In geologic language, it is
called a "woodbine out-lier." Centuries of running
water have removed the woodbine in areas of lower
rocks around Pilot Knob. The Knob has remained be-
cause of the presence of three conspicuous cement-like
sandstone ledges formed in the Woodbine at this spot.
Between the ledges are formations of less hard sand-
stone, clay, and loose sand. Each ledge varies in verti-
cal thickness from two or three feet to around twenty
The red sandy soil of the Cross Timbers is the ex-
planation for the presence of a forest. Sandy soil, hav-
ing a greater porosity than the more impervious clayey
compositions, permits a greater sink-in of precipitation.
However, the thickness of the Woodbine formation is
not definitely known throughout all of the area, for
the dip of the stratum, which extends southeast under-
neath the Black Prairie, changes often and suddenly.
The Cross Timbers section retains today in patch-like
areas a fair share of the forest cover; while at the same
time one may distinguish natural glades from the arti-
ficially cleared areas. Various kinds of deciduous trees
are indigenous to the region, but the post oak and the
black jack seem to predominate. In the stream bot-
toms today are elm, hackberry, pecan, willow oak, wa-
ter oak, and burr oak. The burr oak, the water oak,
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Cowling, Mary Jo. Geography of Denton County, book, 1936; Dallas, Tex.. (texashistory.unt.edu/ark:/67531/metapth90885/m1/90/: accessed March 30, 2017), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; crediting Denton Public Library.