Del Rio Clay

{{Short description|Geologic formation in Texas, United States}}

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| name = Del Rio Clay

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| type = Formation

| age = Cretaceous

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| region = Arkansas

| country = United States

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File:Austin Chalk stratigraphic column in Texas.png in Texas]]

The Del Rio Clay is a geologic formation in Texas. It preserves fossils dating back to the Cretaceous period.

A stratigraphic column at the Mount Bonnell location starts with the Lower Cretaceous Trinity Group overlain by the Edwards Group and the Georgetown Formation. Upper Cretaceous formations follow, starting with the Del Rio Clay, Buda Limestone, and then the Eagle Ford Group. Formations within the Trinity Group include the Hammett Formation, Cow Creek Formation, Hensel Formation, and Lower and Upper Glen Rose Formation. The Upper Cretaceous rock units confine the Edwards Aquifer within the Edwards Group and Georgetown Formation.{{Cite journal|title=Geophysical mapping of Mount Bonnell fault of Balcones fault zone and its implications on Trinity-Edwards Aquifer interconnection, central Texas, USA|journal=The Leading Edge|publisher=Society of Exploration Geophysicists|volume=35|number=9|pages=752–758|doi=10.1190/tle35090752.1|date=September 2016|last=Saribudak|first=Mustafa|url=http://library.seg.org/doi/abs/10.1190/tle35090752.1|accessdate=12 September 2016|url-access=subscription}}