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Eagle Ford Group, the Glossary

The Eagle Ford Group (also called the Eagle Ford Shale) is a sedimentary rock formation deposited during the Cenomanian and Turonian ages of the Late Cretaceous over much of the modern-day state of Texas.^[1]

111 relations: Ammonoidea, Anoxic event, Arcadia Park Shale, Austin Chalk, Austin, Texas, Barrel of oil equivalent, Big Bend National Park, Bioturbation, Boquillas Formation, Bottom water, Britton Formation, Buda Limestone, Calcarenite, Calcareous, Carbonate, Cenomanian, Cenomanian-Turonian boundary event, Clastic rock, Coccolith, Corpus Christi, Texas, Crinoid, Crustacean, Cubic foot, Cyst, Dallas, Deposition (geology), DeWitt County, Texas, Dinoflagellate, Drilling rig, Eagle Ford, Dallas, East Texas, Energy Information Administration, Erosion, Fish, Foraminifera, Fossil, Fracking, Gastropoda, Group (stratigraphy), Houston, Hydrocarbon, Inland sea, Inoceramus, Kamp Ranch Limestone, La Salle County, Texas, Lake Waco Formation, Langtry, Texas, Laredo, Texas, Late Cretaceous, Limestone, ... Expand index (61 more) »
Geologic groups of Texas
Oil fields in Texas
Oil-bearing shales in the United States

Ammonoidea

Ammonoids are extinct spiral shelled cephalopods comprising the subclass Ammonoidea.

See Eagle Ford Group and Ammonoidea

Anoxic event

An anoxic event describes a period wherein large expanses of Earth's oceans were depleted of dissolved oxygen (O2), creating toxic, euxinic (anoxic and sulfidic) waters.

See Eagle Ford Group and Anoxic event

Arcadia Park Shale

The Arcadia Park Shale is a geologic formation within the Eagle Ford Group that outcrops in the northern portion of East Texas. Eagle Ford Group and Arcadia Park Shale are Cretaceous geology of Texas, shale formations of the United States and Turonian Stage.

See Eagle Ford Group and Arcadia Park Shale

Austin Chalk

The Austin Chalk is an upper Cretaceous geologic formation in the Gulf Coast region of the United States. Eagle Ford Group and Austin Chalk are Cretaceous geology of Texas.

See Eagle Ford Group and Austin Chalk

Austin, Texas

Austin is the capital of the U.S. state of Texas and the county seat and most populous city of Travis County, with portions extending into Hays and Williamson counties.

See Eagle Ford Group and Austin, Texas

Barrel of oil equivalent

The barrel of oil equivalent (BOE) is a unit of energy based on the approximate energy released by burning one barrel (or about) of crude oil.

See Eagle Ford Group and Barrel of oil equivalent

Big Bend National Park

Big Bend National Park is an American national park located in West Texas, bordering Mexico.

See Eagle Ford Group and Big Bend National Park

Bioturbation

Bioturbation is defined as the reworking of soils and sediments by animals or plants.

See Eagle Ford Group and Bioturbation

Boquillas Formation

The Boquillas Formation is a geologic formation deposited during the Late Cretaceous in modern-day West Texas. Eagle Ford Group and Boquillas Formation are Cenomanian Stage, Cretaceous geology of Texas and Turonian Stage.

See Eagle Ford Group and Boquillas Formation

Bottom water

Bottom water is the lowermost water mass in a water body, by its bottom, with distinct characteristics, in terms of physics, chemistry, and ecology.

See Eagle Ford Group and Bottom water

Britton Formation

The Britton Formation is a geologic formation deposited during the Middle Cenomanian to the Early Turonian ages of the Late Cretaceous in modern-day East Texas. Eagle Ford Group and Britton Formation are Cretaceous geology of Texas.

See Eagle Ford Group and Britton Formation

Buda Limestone

The Buda Limestone is a geological formation in the High Plains and Trans-Pecos regions of West Texas and in southern New Mexico, whose strata date back to the Late Cretaceous. Eagle Ford Group and Buda Limestone are Cretaceous geology of Texas.

See Eagle Ford Group and Buda Limestone

Calcarenite

Calcarenite is a type of limestone that is composed predominantly, more than 50 percent, of detrital (transported) sand-size (0.0625 to 2 mm in diameter), carbonate grains.

See Eagle Ford Group and Calcarenite

Calcareous

Calcareous is an adjective meaning "mostly or partly composed of calcium carbonate", in other words, containing lime or being chalky.

See Eagle Ford Group and Calcareous

Carbonate

A carbonate is a salt of carbonic acid,, characterized by the presence of the carbonate ion, a polyatomic ion with the formula.

See Eagle Ford Group and Carbonate

Cenomanian

The Cenomanian is, in the International Commission on Stratigraphy's (ICS) geological timescale, the oldest or earliest age of the Late Cretaceous Epoch or the lowest stage of the Upper Cretaceous Series.

See Eagle Ford Group and Cenomanian

Cenomanian-Turonian boundary event

The Cenomanian-Turonian boundary event, also known as the Cenomanian-Turonian extinction, Cenomanian-Turonian Oceanic Anoxic Event (OAE 2), and referred to also as the Bonarelli Event or Level, was an anoxic extinction event in the Cretaceous period. Eagle Ford Group and Cenomanian-Turonian boundary event are Cenomanian Stage and Turonian Stage.

See Eagle Ford Group and Cenomanian-Turonian boundary event

Clastic rock

Clastic rocks are composed of fragments, or clasts, of pre-existing minerals and rock.

See Eagle Ford Group and Clastic rock

Coccolith

Coccoliths are individual plates or scales of calcium carbonate formed by coccolithophores (single-celled phytoplankton such as Emiliania huxleyi) and cover the cell surface arranged in the form of a spherical shell, called a coccosphere.

See Eagle Ford Group and Coccolith

Corpus Christi, Texas

Corpus Christi (Body of Christ) is a coastal city in the South Texas region of the U.S. state of Texas and the county seat and largest city of Nueces County with portions extending into Aransas, Kleberg, and San Patricio counties.

See Eagle Ford Group and Corpus Christi, Texas

Crinoid

Crinoids are marine invertebrates that make up the class Crinoidea.

See Eagle Ford Group and Crinoid

Crustacean

Crustaceans are a group of arthropods that are a part of the subphylum Crustacea, a large, diverse group of mainly aquatic arthropods including decapods (shrimps, prawns, crabs, lobsters and crayfish), seed shrimp, branchiopods, fish lice, krill, remipedes, isopods, barnacles, copepods, opossum shrimps, amphipods and mantis shrimp.

See Eagle Ford Group and Crustacean

The cubic foot (symbol ft3 or cu ft),,. is an imperial and US customary (non-metric) unit of volume, used in the United States and the United Kingdom.

See Eagle Ford Group and Cubic foot

Cyst

A cyst is a closed sac, having a distinct envelope and division compared with the nearby tissue.

See Eagle Ford Group and Cyst

Dallas

Dallas is a city in the U.S. state of Texas and the most populous city in the Dallas–Fort Worth metroplex, the most populous metropolitan area in Texas and the fourth-most populous metropolitan area in the United States at 7.5 million people.

See Eagle Ford Group and Dallas

Deposition (geology)

Deposition is the geological process in which sediments, soil and rocks are added to a landform or landmass.

See Eagle Ford Group and Deposition (geology)

DeWitt County, Texas

DeWitt County is a county located in the U.S. state of Texas.

See Eagle Ford Group and DeWitt County, Texas

Dinoflagellate

The dinoflagellates are a monophyletic group of single-celled eukaryotes constituting the phylum Dinoflagellata and are usually considered protists.

See Eagle Ford Group and Dinoflagellate

Drilling rig

A drilling rig is an integrated system that drills wells, such as oil or water wells, or holes for piling and other construction purposes, into the earth's subsurface.

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Eagle Ford, Dallas

Ledbetter/Eagle Ford is a neighborhood in West Dallas, Texas, United States.

See Eagle Ford Group and Eagle Ford, Dallas

East Texas

East Texas is a broadly defined cultural, geographic, and ecological region in the eastern part of the U.S. state of Texas that comprises most of 41 counties.

See Eagle Ford Group and East Texas

Energy Information Administration

The U.S. Energy Information Administration (EIA) is a principal agency of the U.S. Federal Statistical System responsible for collecting, analyzing, and disseminating energy information to promote sound policymaking, efficient markets, and public understanding of energy and its interaction with the economy and the environment.

See Eagle Ford Group and Energy Information Administration

Erosion

Erosion is the action of surface processes (such as water flow or wind) that removes soil, rock, or dissolved material from one location on the Earth's crust and then transports it to another location where it is deposited.

See Eagle Ford Group and Erosion

Fish

A fish (fish or fishes) is an aquatic, anamniotic, gill-bearing vertebrate animal with swimming fins and a hard skull, but lacking limbs with digits.

See Eagle Ford Group and Fish

Foraminifera

Foraminifera (Latin for "hole bearers"; informally called "forams") are single-celled organisms, members of a phylum or class of Rhizarian protists characterized by streaming granular ectoplasm for catching food and other uses; and commonly an external shell (called a "test") of diverse forms and materials.

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Fossil

A fossil (from Classical Latin) is any preserved remains, impression, or trace of any once-living thing from a past geological age.

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Fracking

Fracking (also known as hydraulic fracturing, fracing, hydrofracturing, or hydrofracking) is a well stimulation technique involving the fracturing of formations in bedrock by a pressurized liquid.

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Gastropoda

Gastropods, commonly known as slugs and snails, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda.

See Eagle Ford Group and Gastropoda

Group (stratigraphy)

In geology, a group is a lithostratigraphic unit consisting of a series of related formations that have been classified together to form a group.

See Eagle Ford Group and Group (stratigraphy)

Houston

Houston is the most populous city in the U.S. state of Texas and in the Southern United States.

See Eagle Ford Group and Houston

Hydrocarbon

In organic chemistry, a hydrocarbon is an organic compound consisting entirely of hydrogen and carbon.

See Eagle Ford Group and Hydrocarbon

Inland sea

An inland sea (also known as an epeiric sea or an epicontinental sea) is a continental body of water which is very large in area and is either completely surrounded by dry land or connected to an ocean by a river, strait or "arm of the sea".

See Eagle Ford Group and Inland sea

Inoceramus

Inoceramus (Greek: translation "strong pot") is an extinct genus of fossil marine pteriomorphian bivalves that superficially resembled the related winged pearly oysters of the extant genus Pteria.

See Eagle Ford Group and Inoceramus

Kamp Ranch Limestone

The Kamp Ranch Limestone is a geologic formation in Dallas County, Texas. Eagle Ford Group and Kamp Ranch Limestone are Cretaceous geology of Texas.

See Eagle Ford Group and Kamp Ranch Limestone

La Salle County, Texas

La Salle County is a county in Texas.

See Eagle Ford Group and La Salle County, Texas

Lake Waco Formation

The Lake Waco Formation is a geologic formation within the Eagle Ford Group deposited during the Middle Cenomanian to the Early Turonian of the Late Cretaceous in central Texas. Eagle Ford Group and Lake Waco Formation are Cenomanian Stage, Cretaceous geology of Texas, shale formations of the United States and Turonian Stage.

See Eagle Ford Group and Lake Waco Formation

Langtry, Texas

Langtry is an unincorporated community in Val Verde County, Texas, United States.

See Eagle Ford Group and Langtry, Texas

Laredo, Texas

Laredo is a city in the U.S. state of Texas and seat of Webb County, on the north bank of the Rio Grande in South Texas, across from Nuevo Laredo, Tamaulipas, Mexico.

See Eagle Ford Group and Laredo, Texas

Late Cretaceous

The Late Cretaceous (100.5–66 Ma) is the younger of two epochs into which the Cretaceous Period is divided in the geologic time scale.

See Eagle Ford Group and Late Cretaceous

Limestone

Limestone (calcium carbonate) is a type of carbonate sedimentary rock which is the main source of the material lime.

See Eagle Ford Group and Limestone

List of fossiliferous stratigraphic units in Texas

This article contains a list of fossil-bearing stratigraphic units in the state of Texas, U.S.

See Eagle Ford Group and List of fossiliferous stratigraphic units in Texas

List of rock formations

A rock formation is an isolated, scenic, or spectacular surface rock outcrop.

See Eagle Ford Group and List of rock formations

Llano Uplift

The Llano Uplift is a geologically ancient, low geologic dome that is about in diameter and located mostly in Llano, Mason, San Saba, Gillespie, and Blanco counties, Texas.

See Eagle Ford Group and Llano Uplift

Louisiana

Louisiana (Louisiane; Luisiana; Lwizyàn) is a state in the Deep South and South Central regions of the United States.

See Eagle Ford Group and Louisiana

Marine regression

A marine regression is a geological process occurring when areas of submerged seafloor are exposed during a drop in sea level.

See Eagle Ford Group and Marine regression

Marine transgression

A marine transgression is a geologic event during which sea level rises relative to the land and the shoreline moves toward higher ground, which results in flooding.

See Eagle Ford Group and Marine transgression

Marl

Marl is an earthy material rich in carbonate minerals, clays, and silt.

See Eagle Ford Group and Marl

Maverick County, Texas

Maverick County is a county located in the U.S. state of Texas.

See Eagle Ford Group and Maverick County, Texas

Mexico

Mexico, officially the United Mexican States, is a country in the southern portion of North America.

See Eagle Ford Group and Mexico

Microfossil

A microfossil is a fossil that is generally between 0.001 mm and 1 mm in size, the visual study of which requires the use of light or electron microscopy.

See Eagle Ford Group and Microfossil

Molybdenum

Molybdenum is a chemical element; it has symbol Mo (from Neo-Latin molybdaenum) and atomic number 42.

See Eagle Ford Group and Molybdenum

Mosasaur

Mosasaurs (from Latin Mosa meaning the 'Meuse', and Greek σαύρος sauros meaning 'lizard') are an extinct group of large aquatic reptiles within the family Mosasauridae that lived during the Late Cretaceous.

See Eagle Ford Group and Mosasaur

Natural-gas condensate

Natural-gas condensate, also called natural gas liquids, is a low-density mixture of hydrocarbon liquids that are present as gaseous components in the raw natural gas produced from many natural gas fields.

See Eagle Ford Group and Natural-gas condensate

Oil

An oil is any nonpolar chemical substance that is composed primarily of hydrocarbons and is hydrophobic (does not mix with water) and lipophilic (mixes with other oils).

See Eagle Ford Group and Oil

Oklahoma

Oklahoma (Choctaw: Oklahumma) is a state in the South Central region of the United States.

See Eagle Ford Group and Oklahoma

Organic matter

Organic matter, organic material, or natural organic matter refers to the large source of carbon-based compounds found within natural and engineered, terrestrial, and aquatic environments.

See Eagle Ford Group and Organic matter

Ouachita orogeny

The Ouachita orogeny was a mountain-building event that resulted in the folding and faulting of strata currently exposed in the Ouachita Mountains.

See Eagle Ford Group and Ouachita orogeny

Outcrop

An outcrop or rocky outcrop is a visible exposure of bedrock or ancient superficial deposits on the surface of the Earth and other terrestrial planets.

See Eagle Ford Group and Outcrop

Oyster

Oyster is the common name for a number of different families of salt-water bivalve molluscs that live in marine or brackish habitats.

See Eagle Ford Group and Oyster

Paleontology in Texas

Paleontology in Texas refers to paleontological research occurring within or conducted by people from the U.S. state of Texas.

See Eagle Ford Group and Paleontology in Texas

Pemex

Pemex (a portmanteau of Petróleos Mexicanos, which translates to Mexican Petroleum in English) is the Mexican state-owned petroleum company managed and operated by the Mexican government.

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Petrohawk

Petrohawk Energy Corporation was an independent energy company headquartered in Houston, Texas.

See Eagle Ford Group and Petrohawk

Plankton

Plankton are the diverse collection of organisms that drift in water (or air) but are unable to actively propel themselves against currents (or wind).

See Eagle Ford Group and Plankton

Plesiosaur

The Plesiosauria (Greek: πλησίος, plesios, meaning "near to" and ''sauros'', meaning "lizard") or plesiosaurs are an order or clade of extinct Mesozoic marine reptiles, belonging to the Sauropterygia.

See Eagle Ford Group and Plesiosaur

Radiolaria

The Radiolaria, also called Radiozoa, are protozoa of diameter 0.1–0.2 mm that produce intricate mineral skeletons, typically with a central capsule dividing the cell into the inner and outer portions of endoplasm and ectoplasm.

See Eagle Ford Group and Radiolaria

Redox

Redox (reduction–oxidation or oxidation–reduction) is a type of chemical reaction in which the oxidation states of the reactants change.

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Reuters

Reuters is a news agency owned by Thomson Reuters.

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Rio Grande

The Rio Grande in the United States or the Río Bravo (del Norte) in Mexico, also known as P’osoge in Tewa and Tó Ba’áadi in Navajo, is one of the principal rivers (along with the Colorado River) in the southwestern United States and in northern Mexico.

See Eagle Ford Group and Rio Grande

Ripple marks

In geology, ripple marks are sedimentary structures (i.e., bedforms of the lower flow regime) and indicate agitation by water (current or waves) or directly by wind.

See Eagle Ford Group and Ripple marks

River delta

A river delta is a landform shaped like a triangle, created by the deposition of sediment that is carried by a river and enters slower-moving or stagnant water.

See Eagle Ford Group and River delta

San Antonio

San Antonio (Spanish for "Saint Anthony"), officially the City of San Antonio, is a city in the U.S. state of Texas and the most populous city in Greater San Antonio, the third-largest metropolitan area in Texas and the 24th-largest metropolitan area in the United States at 2.6 million people in the 2020 US census.

See Eagle Ford Group and San Antonio

San Antonio Express-News

The San Antonio Express-News is a daily newspaper in San Antonio, Texas, founded in 1865.

See Eagle Ford Group and San Antonio Express-News

Sandstone

Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains, cemented together by another mineral.

See Eagle Ford Group and Sandstone

Sea level

Mean sea level (MSL, often shortened to sea level) is an average surface level of one or more among Earth's coastal bodies of water from which heights such as elevation may be measured.

See Eagle Ford Group and Sea level

Sea urchin

Sea urchins or urchins, alternatively known as sea hedgehogs, are typically spiny, globular animals, echinoderms in the class Echinoidea.

See Eagle Ford Group and Sea urchin

Sediment

Sediment is a naturally occurring material that is broken down by processes of weathering and erosion, and is subsequently transported by the action of wind, water, or ice or by the force of gravity acting on the particles.

See Eagle Ford Group and Sediment

Sedimentary rock

Sedimentary rocks are types of rock that are formed by the accumulation or deposition of mineral or organic particles at Earth's surface, followed by cementation.

See Eagle Ford Group and Sedimentary rock

Shale

Shale is a fine-grained, clastic sedimentary rock formed from mud that is a mix of flakes of clay minerals (hydrous aluminium phyllosilicates, e.g. kaolin, Al2Si2O5(OH)4) and tiny fragments (silt-sized particles) of other minerals, especially quartz and calcite.

See Eagle Ford Group and Shale

Shark

Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head.

See Eagle Ford Group and Shark

Siltstone

Siltstone, also known as aleurolite, is a clastic sedimentary rock that is composed mostly of silt.

See Eagle Ford Group and Siltstone

Sligo Formation

The Sligo Formation is a geologic formation in Texas. Eagle Ford Group and Sligo Formation are Cretaceous geology of Texas.

See Eagle Ford Group and Sligo Formation

Source rock

In petroleum geology, source rock is rock which has generated hydrocarbons or which could generate hydrocarbons.

See Eagle Ford Group and Source rock

South Texas

South Texas is a region of the U.S. state of Texas that lies roughly south of—and includes—San Antonio.

See Eagle Ford Group and South Texas

Stuart City Formation

The Stuart City Formation is a geologic formation in Texas. Eagle Ford Group and Stuart City Formation are Cretaceous geology of Texas.

See Eagle Ford Group and Stuart City Formation

Teknisk Ukeblad

Teknisk Ukeblad (TU, Technical Weekly Magazine) is a Norwegian engineering magazine.

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Texas

Texas (Texas or Tejas) is the most populous state in the South Central region of the United States.

See Eagle Ford Group and Texas

Tight oil

Tight oil (also known as shale oil, shale-hosted oil or light tight oil, abbreviated LTO) is light crude oil contained in unconventional petroleum-bearing formations of low permeability, often shale or tight sandstone.

See Eagle Ford Group and Tight oil

Trace fossil

A trace fossil, also known as an ichnofossil (from ἴχνος ikhnos "trace, track"), is a fossil record of biological activity by lifeforms but not the preserved remains of the organism itself.

See Eagle Ford Group and Trace fossil

Trinity River (Texas)

The Trinity River is a river, the longest with a watershed entirely within the U.S. state of Texas.

See Eagle Ford Group and Trinity River (Texas)

Turonian

The Turonian is, in the ICS' geologic timescale, the second age in the Late Cretaceous Epoch, or a stage in the Upper Cretaceous Series.

See Eagle Ford Group and Turonian

Unconformity

An unconformity is a buried erosional or non-depositional surface separating two rock masses or strata of different ages, indicating that sediment deposition was not continuous.

See Eagle Ford Group and Unconformity

Unconventional (oil and gas) reservoir

Unconventional (oil and gas) reservoirs, or unconventional resources (resource plays) are accumulations where oil and gas phases are tightly bound to the rock fabric by strong capillary forces, requiring specialised measures for evaluation and extraction.

See Eagle Ford Group and Unconventional (oil and gas) reservoir

Uranium

Uranium is a chemical element; it has symbol U and atomic number 92.

See Eagle Ford Group and Uranium

Vanadium

Vanadium is a chemical element; it has symbol V and atomic number 23.

See Eagle Ford Group and Vanadium

Victoria, Texas

Victoria is a city and the county seat of Victoria County, Texas.

See Eagle Ford Group and Victoria, Texas

Volcanic ash

Volcanic ash consists of fragments of rock, mineral crystals, and volcanic glass, produced during volcanic eruptions and measuring less than 2 mm (0.079 inches) in diameter.

See Eagle Ford Group and Volcanic ash

Webb County, Texas

Webb County is a county located in the U.S. state of Texas.

See Eagle Ford Group and Webb County, Texas

West Texas

West Texas is a loosely defined region in the U.S. state of Texas, generally encompassing the arid and semiarid lands west of a line drawn between the cities of Wichita Falls, Abilene, and Del Rio.

See Eagle Ford Group and West Texas

Western Interior Seaway

The Western Interior Seaway (also called the Cretaceous Seaway, the Niobraran Sea, the North American Inland Sea, and the Western Interior Sea) was a large inland sea that split the continent of North America into two landmasses for 34 million years.

See Eagle Ford Group and Western Interior Seaway

Wood Mackenzie

Wood Mackenzie, also known as WoodMac, is a global provider of data and analytics for the energy transition.

See Eagle Ford Group and Wood Mackenzie

Woodbine Group

The Woodbine Group is a geological formation in east Texas whose strata date back to the Early to Middle Cenomanian age of the Late Cretaceous. Eagle Ford Group and Woodbine Group are Cenomanian Stage, Cretaceous geology of Texas and upper Cretaceous Series of North America.

See Eagle Ford Group and Woodbine Group

References

[1] https://en.wikipedia.org/wiki/Eagle_Ford_Group

Also known as Eagle Ford Formation, Eagle Ford Shale, Eagle Ford Shale Play, Eagleford shale.

, List of fossiliferous stratigraphic units in Texas, List of rock formations, Llano Uplift, Louisiana, Marine regression, Marine transgression, Marl, Maverick County, Texas, Mexico, Microfossil, Molybdenum, Mosasaur, Natural-gas condensate, Oil, Oklahoma, Organic matter, Ouachita orogeny, Outcrop, Oyster, Paleontology in Texas, Pemex, Petrohawk, Plankton, Plesiosaur, Radiolaria, Redox, Reuters, Rio Grande, Ripple marks, River delta, San Antonio, San Antonio Express-News, Sandstone, Sea level, Sea urchin, Sediment, Sedimentary rock, Shale, Shark, Siltstone, Sligo Formation, Source rock, South Texas, Stuart City Formation, Teknisk Ukeblad, Texas, Tight oil, Trace fossil, Trinity River (Texas), Turonian, Unconformity, Unconventional (oil and gas) reservoir, Uranium, Vanadium, Victoria, Texas, Volcanic ash, Webb County, Texas, West Texas, Western Interior Seaway, Wood Mackenzie, Woodbine Group.

Eagle Ford Group, the Glossary

Table of Contents

See also

Geologic groups of Texas

Oil fields in Texas

Oil-bearing shales in the United States

References