Geology as a Georegional Influence on Quercus Fagaceae Distribution in Denton and Coke Counties of Central and North Central Texas and Choctaw County of Southeastern Oklahoma, Using GIS as an Analytical Tool. Page: 15
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western edge of the Cross Timbers. The sandy soils underlain by red or yellowish clay
suggests edaphic distributional controls, rather than critical climatic variations as the
controlling factor in the oak forest distribution.
Table 2.1: Modified from Winton's 1925, The Geology of Denton County
Thickness
Formation Common Fossils Lithology (feet) Vegetation
(feet)Austin Chalk
Eagle Ford
Woodbine
Grayson
MainStreetPawpaw
Weno
DentonFort Worth
Duck Creek
Kiamita
GoodlandWalnut
Microfauna, shark
teethGryphea
mucronata
Kingena
wacoensis,
Turrilites
brazoensisDwarfed Pyrite
FaunaGryphea
washitensis,
Ostrea carinata
Gryphea
washitensis,
Ostrea carinata
Schloenbachia
leonensis,
Hemiaster elegans
Hamites (bottom)
Gryphea navia
(top)
Gryphea Marcoui
(top)White limestone with
thin seams of marl
Black oily shales,
sandstone ledges
Sandstone, clay and
shales
Marls and thin
limestone
Limestone
Reddish clay, red
sandstone
Blue-gray shales,
clay, "quarry"
limestone
Limestone, marl, clay
Alternating limestone
and marl
Calcareous clays and
this sandy limestone
LimestoneSandstone, clay
Note: (~) No data given.
15
500
500Blackjack
and scrub
oaks39
14-20Blackjack
and scrub
oaks66-105
25-35
25-35Treeless
110
42-0
42-75
14-16
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Maxey, George F. Geology as a Georegional Influence on Quercus Fagaceae Distribution in Denton and Coke Counties of Central and North Central Texas and Choctaw County of Southeastern Oklahoma, Using GIS as an Analytical Tool., dissertation, December 2007; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc5144/m1/25/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .