Trinity Group (geologic group)

The Trinity Group is a group (sequence of rock strata) in the Lower Cretaceous lithostratigraphy of Texas, Arkansas, Mississippi, Louisiana and Oklahoma.^[2][3][4] It is named for the Trinity River of Texas.

TypeGroup

Sub-units

• Paluxy Formation
• Glen Rose Formation
• Twin Mountains Formation

UnderliesFredericksburg sands, Goodland Formation

OverliesCotton Valley Formation

Quick facts Type, Sub-units ...

Trinity Group
Stratigraphic range: late Aptian-early Albian, 115–106 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Group
Sub-units	Paluxy Formation Glen Rose Formation Twin Mountains Formation
Underlies	Fredericksburg sands, Goodland Formation
Overlies	Cotton Valley Formation
Location
Region	Texas, Arkansas
Country	United States
Type section
Named for	Trinity Rivers, Texas
Named by	Robert Thomas Hill[1]

Close

A stratigraphic column at the Mount Bonnell Fault location starts with the Lower Cretaceous Trinity Group overlain by the Edwards Group. 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 Hammett and the lower portion of the Upper Glen Rose act as confining units (or aquitard) for the Middle Trinity Aquifer. The Upper Glen Rose contains the Upper Trinity Aquifer, which appears to have intra-aquifer groundwater flow with the Edwards Aquifer as water levels are at the same elevation.^[5]