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Geological group in west Wales
The Gray Sandstone Group is a late Silurian lithostratigraphic group (a sequence of rock strata) in west Wales. The strata are exposed in the coast around
Gray_Sandstone_Group
Geological formation in Great Britain
Group comprises calcareous marls with occasional sandstones along with conglomerates and breccias. The Group unconformably overlies rocks of the Gray
Milford_Haven_Group
representing a delta-top setting, with many light-gray sandstones and occasional red sandstones, siltstones, tuff and conglomerates. "GEOLOGY OF THE
Gibbett_Hill_Formation
Geologic unit found in the Illinois Basin, U.S.
equitant is the Buffalo Wallow Group. This unit grades from sandstones at its base into mix of limestones and sandstone and then a shale at its top. In
Pope_Mega_Group
Geologic unit in eastern North America
The Potsdam Sandstone, more formally known as the Potsdam Group, is a geologic unit of mid-to-late Cambrian age found in Northern New York and northern
Potsdam_Sandstone
Geologic formation in Oklahoma and Arkansas, United States
Jackfork Sandstone is a thin- to massive-bedded, fine- to coarse-grained, brown, tan, or gray quartzitic sandstone with subordinate brown, silty sandstone and
Jackfork_Sandstone
Geologic formation in the United States
made gray sandstones, often interbedded, light-gray siltstones, shales, with occasional conglomerate lenses. Colors vary from gray to light gray sandstones
Venango_Group
Cambrian geologic unit in the Grand Canyon region, Arizona
Grand Canyon. As currently defined, the Tonto groups consists of the Sixtymile Formation, Tapeats Sandstone, Bright Angel Shale (or Formation), Muav Limestone
Tonto_Group
Geologic formation
and downwash from adjacent land. The result is a gray to brown sandy shale with local coal and sandstone deposits. As the sea level begins to rise slightly
Kansas_City_Group
Geologic formation in the Grand Canyon
abandoned) Aubrey Group to the Supai Formation, at the same time assigning the overlying gray sandstone beds to the Coconino Sandstone. In 1922, Noble separated
Supai_Group
Group of geologic formations in the western United States
the group is a simple regression sequence and remains at formation rank. Here the group is described as interbedded light gray sandstone and gray shale
Mesaverde_Group
Old Red Sandstone Group: Brecon Subgroup Cosheston Subgroup Ditton Subgroup Downton Subgroup Milford Haven Subgroup Pembroke Limestone Group: Blackrock
List of geological groups of Great Britain
List_of_geological_groups_of_Great_Britain
Mapped unit of rock in North America
Pennsylvania, and olive-gray to drab, thin-bedded sandstone. In Maryland, the Rose Hill Formation contained the Cresaptown Iron Sandstone. Relative age dating
Clinton_Group
Overview of geology in Pembrokeshire, UK
Group occur south of St Ishmaels and to the south and west of Marloes. These are overlain by the sandstones and mudstones of the Gray Sandstone Group
Geology_of_Pembrokeshire
Sandstone geological formation in Virginia, United States
Chatham Group from older rocks which were undergoing erosion during the Late Triassic. Several subunits have been named for the Manassas Sandstone: Reston
Manassas_Sandstone
Bedrock unit in Pennsylvania, Maryland, West Virginia, and Virginia, US
coarse-grained orthoquartzite. It is a white to medium-gray or gray-green subgraywacke, sandstone, siltstone and shale, cross-stratified and conglomeratic
Tuscarora_Sandstone
Geological formation in Newfoundland, Canada
being formed of thickly bedded gray sandstones and quartz-granule conglomerates, and the lower section formed of gray and purple shales, and siltstones
Cape_Ballard_Formation
Formation cropping in Newfoundland
consists of gray sandstones, with minor conglomerates. It has only one member, the High Rocks Member, which consists of shales and red bedded sandstone. "GEOLOGY
Ferryland_Head_Formation
Bedrock unit in the Appalachian Mountains of North America
Plateau. The Pottsville Formation consists of a gray conglomerate, fine to coarse grained sandstone, and is known to contain limestone, siltstone and
Pottsville_Formation
Geologic formation of Permian age in the southwestern United States
Plateau. He named the Coconino sandstone for the cross-bedded gray to white sandstones that form a conspicuous sheer cliff in walls of Grand Canyon and
Coconino_Sandstone
Sandstone formation in the United States
each other. The sandstone overlies the Bedford Shale and the Ohio Shale and underlies the Sunbury Shale. Berea Sandstone is light gray to buff-colored
Berea_Sandstone
Rock units in midwestern North America
unit name of formation and group rank in Midwestern North America. The Dakota units are generally composed of sandstones, mudstones, clays, and shales
Dakota_Formation
Geologic formation in Indiana, USA
shaley limestone. The Jeffersonville Limestone is a coarse grained, dark gray, thick bedded, fossiliferous limestone. Quarries in Pulaski and Shelby Counties
Muscatatuck_Group
North America. It is composed of mudstone, sandstone, siltstone, and limestone, and is light gray, greenish gray, or red. Most of the fossils occur in the
List of dinosaurs of the Morrison Formation
List_of_dinosaurs_of_the_Morrison_Formation
Geologic formation in the United States
The Wiscoy Sandstone (Hartnagel, 1912) generally correlates with the Hanover Shale to the west. It is made up of interbedded sandstone and shale. Studies
Java_Group
Geologic formation in the United States
fossiliferous shale that makes up the lowermost formation in the Galena Group. The Decorah lies above the Platteville Limestone and below the Cummingsville
Decorah_Shale
Orleans County NY sandstone quarry history
sandstone is a geographic subset of the Medina Group stratigraphic formation in New York State and beyond. The name refers specifically to sandstone first
Medina_sandstone
Geologic formation in New Mexico, US
Glorietta Sandstone is a massive yellowish brown to light gray, cliff-forming, fine to medium grained, very mature quartzarenite sandstone that weathers
Glorieta_Sandstone
Geologic group in the United States
Base of the Mansfield Sandstone in Southern Indiana". Indiana Academy of Science. Henry H., Gray (1978). "Buffalo Wallow — Group Upper Chesterian (Mississippian)
Buffalo_Wallow_Group
Western Lake Superior Sandstone. Prior to the 1900s, Bayfield group sandstone was also variously named Lake Superior Sandstone, brownstone, or redstone
Bayfield_group
themselves overlain by the sandstones of the Tintern Sandstone Group. Each of these layers is tilted to the south. Gray Hill is known locally for its
Gray_Hill,_Monmouthshire
Formation in Newfoundland, Canada
cropping out in Newfoundland. It predominantly consists of a red to gray sandstone, interlaced with various mudstones, siltstones, and conglomerates, and
Bay_de_Verde_Formation
Geologic formation
298.9 million years ago. The Pleasanton Group, a span of rocks that is mostly shale but includes some sandstone, limestone, and coal . . . These rocks
Pleasanton_Group
Cretaceous Period. The formation consists of yellow-gray quartz sandstone with minor siltstone. The sandstone is planar crossbedded and bioturbated and locally
Romeroville_Sandstone
Geologic formation in Wyoming, United States
Chugwater Group. It preserves fossils dating back to the Triassic period. It is composed of siltstone, claystone, and very fine grained sandstone that is
Red_Peak_Formation
Geologic formation in Mongolia
cemented reddish-orange and pale orange to light gray, medium to fine-grained sands and sandstones, which include minor deposits of calcareous concretions
Djadochta_Formation
Sequence of geologic strata of Proterozoic age
the "Unkar Group" into five subunits, which were the Hotauta Conglomerate, Bass Limestone, Hakatai Shale, Shinumo Quartzite, and Dox Sandstone. The still
Unkar_Group
Mapped bedrock unit in the United States
Chugwater Formation is a mapped bedrock unit consisting primarily of red sandstone, in the states of Wyoming, Montana, and Colorado in the United States
Chugwater_Formation
Geological formation in the eastern U.S.
"Purslane" in 1989. The Pocono is a dominantly gray color with quartzitic medium to coarse-grained sandstones. The base of the Pocono Formation is marked
Pocono_Formation
Large Geologic Group
Undifferentiated Salina is the Tymochtee Formation. This can be light to dark gray dolomite. Moving west it becomes more shaley to the point that it maybe considered
Salina_Group
Geological Group in North America
Hamilton Group consists of the Mahantango Formation, a gray, dark gray, brown, and olive laminated shale; siltstone; and very fine-grained sandstone or claystone
Hamilton_Group
Geological fault in Great Britain
overlying Gray Sandstone Group across the fault. The percentage of thickening continues to rise to over 150% in the lower part of the Milford Haven Group, increasing
Benton_Fault
Geologic formation in Arizona and New Mexico
meters (266 ft) thick and consists mostly of pale orange to yellow-gray sandstone (66%), claystone (16%) and sandy siltstone (16%). Sedimentary structures
Chuska_Sandstone
Assemblage of geological formations in central USA
consists mainly of dark brown and gray dolomitic shale. In north central Illinois, the bottom half is dominantly a yellowish gray coarse crystalline dolomite
Maquoketa_Group
Geologic group in the Appalachian Basin, U.S.
Group is shale. The Rhinestreet Member can be further subdivided into two shale types: a thick, fissile black shale underlies a gray to greenish-gray
West_Falls_Group
with the contact placed at the base of a sandstone interval above the uppermost massive limestone of the Gray Mesa Formation. The lowermost Elephant Butte
Gray_Mesa_Formation
Chinle Group/Santa Rosa Formation Triassic Chinle Group/Sheep Pen Sandstone Triassic Chinle Group/Sloan Canyon Formation Triassic Chinle Group/Trujillo
List of fossiliferous stratigraphic units in New Mexico
List_of_fossiliferous_stratigraphic_units_in_New_Mexico
Geological formation in the United States
Hamilton Group. Sherman Ridge: Olive gray, fossiliferous, claystone and siltstone with interbedded fine sandstone coarsening upward. Montebello Sandstone: Olive
Mahantango_Formation
Geology of an area in Utah, US
cliff-forming cross-bedded sandstones and slope-forming yellowish-gray to bluish-gray mudstones with interbedded light gray sandstones. Fossils of bivalves
Geology of the Capitol Reef area
Geology_of_the_Capitol_Reef_area
Stratigraphic Group in Brazil
fluviolacustrine phase and is composed of red and gray shales, siltstones and claystones. The Santana Group was formed during this stage and comprises three
Santana_Group
as 20 percent of some sandstones. Unoxidized rocks are mostly light gray but are light brown or buff where oxidized. The sandstone is weakly cemented, most
Renton_Formation
Geologic group in North America
succession in Kansas. The Colorado Group consists primarily of chalky and non-chalky shale, and incorporates conglomerate, sandstone and siltstone, rhythmite beds
Colorado_Group
Geologic formation in Newfoundland, Canada
Ediacaran formation cropping out in Newfoundland. It consists of gray to red arkose sandstone, alongside a granulated conglomerate. "GEOLOGY OF THE AVALON
Big_Head_Formation
Geologic Formation in the United States
siltstone and thin-bedded sandstone. The upper part is a salmon-pink and light-gray, fine- to medium-grained cliff-forming sandstone that exhibits massive
Nugget_Sandstone
Landform in the Grand Canyon, Arizona
northwest toward south side of Alsap Butte, upper Nankoweap Canyon. Gray Esplanade Sandstone cliff, overlying red slope of Wescogame Formation, overlying white
Watahomigi_Formation
Geologic formation in New Mexico, USA
fragments. The shales are reddish brown to purplish while the sandstones are light gray. The sandstones are medium bedded to massive and sometimes form hogbacks
McRae_Group
Geologic formation in the United States
overlies the thin Glenwood Shale, which overlies the thick St. Peter Sandstone. It is shot through with dolomitic mottles in an anastomose pattern; this
Platteville_Limestone
Geologic formation in Mexico
The Balumtun Sandstone is a geologic formation in Chiapas, Mexico. The formation is up to 760 metres thick, and consists of gray sandstone, that were deposited
Balumtun_Sandstone
Middle Devonian age unit of sedimentary rock
a dark gray to grayish black silty shale and siltstone; the Turkey Ridge Member (Dmt), an olive to dark-gray fine to medium grained sandstone; and the
Marcellus_Formation
Geologic formation in Nebraska, United States
layers of very fine-grained, volcaniclastic sandstone and thin, horizontally stratified pale-to-gray brown sandstone, as well as sand crystals and ash beds
Gering_Formation
Geological formation in Pennsylvania
of the Kinzers Formation is primarily a dark-brown shale. The middle is a gray and white spotted limestone and, locally, marble having irregular partings
Kinzers_Formation
Geologic formation in the United States
formation is made up of black shale. There are thin beds of non-organic gray shale as well as limestone concretions interbedded throughout the formation
Rhinestreet_Formation
Geological formation in New Mexico and Colorado
sequence of thinly bedded sandstone and shale, while the upper is a massive medium- to fine-grained cross-bedded sandstone, light gray to buff in color, that
Point_Lookout_Sandstone
Rock formation in the western United States
North America. It is composed of mudstone, sandstone, siltstone, and limestone and is light gray, greenish gray, or red. Most of the fossils occur in the
Morrison_Formation
is just a matter of personal preference. This organic shale is blackish gray, it may also have an olive, brown or grayish. Subsurface the bedding is massive
Burket_Shale
Bedrock formation found in the Midwestern United States
Group that primarily consists of shale (75%) with some limestone (25%) interbedded. In general, it has a bluish-gray color that weathers light gray to
Kope_Formation
Early Cretaceous geological formation in Thailand
middle member of the Khorat Group. It consists of an alteration of pale red to yellowish-gray, fine to medium-grained sandstone and grayish-reddish brown
Sao_Khua_Formation
Region of the Colorado Plateau, US
rocks") is a region of the Colorado Plateau characterized by a cluster of sandstone buttes, with the largest reaching 1,000 ft (300 m) above the valley floor
Monument_Valley
Geologic formation in Ohio
members are recognized, among them the Orangeville Shale, Sharpsville Sandstone, and Meadville Shale. It preserves fossils dating to the Mississippian
Cuyahoga_Formation
Geologic formation in Western Australia
bedded chert; pillow basalt; carbonate rocks; minor felsic volcaniclastic sandstone and conglomerate; hydrothermal barite; evaporites; and stromatolites.
Dresser_Formation
Geologic formation in the United States
roughly equivalent to the Salina group that is found to the north and west. The basal 50 m consists of medium-dark-gray laminated to thin-bedded calcisiltite
Tonoloway_Formation
Assembly of magmatic and sedimentary rocks that date to the Mesoproterozoic
sedimentary rocks, primarily mudstones, siltstones, fine-grained quartzose sandstones and limestones. Most have undergone weak metamorphism to greenschist facies
Belt_Supergroup
Geologic formation in the United States
The Mount Simon Sandstone is an Upper Cambrian sandstone and is found in many states in the Midwest such as Wisconsin, Minnesota, Iowa, Illinois, and Missouri
Mount_Simon_Sandstone
Devonian geologic unit in the Appalachian basin
composed chiefly of shale and mudrocks. The color is usually medium to dark gray. As with most members the grain size increases moving eastward, making the
Genesee_Formation
Geologic formation in Utah
Formation is composed of shallow marine sandstone, with thin beds of mudstone and minor limestone and gypsum. The sandstone is grayish-green in color and flat
Curtis_Formation
Geologic formation in New Mexico and Arizona
sandstone, and coal. Sandstone is commonly crossbedded or ripple laminated." The Dalton Sandstone Member is described as "Gray to yellowish gray, fine- to medium-grained
Crevasse_Canyon_Formation
Bedrock unit in the Eastern United States
greenish-gray shale containing local limestone and sandstone zones, or more specifically as an olive to yellowish-gray, thin-bedded sandstone, calcareous
Wills_Creek_Formation
Southern California geological formation
The Matilija Sandstone (/məˈtɪləhə/) is a sedimentary geologic unit of Eocene epoch in the Paleogene Period, found in Santa Barbara and Ventura Counties
Matilija_Sandstone
Geologic formation in the western US
Colorado. He described it as a medium gray shale, capped with limestone or sandstone, and assigned it to the Benton Group. By 1931, William Walden Rubey and
Carlile_Shale
Geologic formation in the western United States
Beds". Retrieved 2010-01-07. Lexicon of Canadian Geologic Units. "Kisbey Sandstone". Retrieved 2010-01-07. Lexicon of Canadian Geologic Units. "Alida Beds"
Madison_Group
North America. It is composed of mudstone, sandstone, siltstone and limestone and is light grey, greenish gray, or red. Most of the fossils occur in the
Paleobiota of the Morrison Formation
Paleobiota_of_the_Morrison_Formation
Mountain range of the Southern Rocky Mountains of North America
confirming advancing and retreating near-shore environments. These Dakota Group sandstone beds are resistant to erosion and have uplifted to form the Dakota
Front_Range
Geologic formation in Poland
marine deposits. It mainly consists of light whitish-grey, fine grained sandstones interbedded by clay containing plant detritus and minute fragments of
Borucice_Formation
Part of the geologic Grand Canyon Supergroup
sandstone and dolomite beds. The mudrocks are typically gray to black when freshly exposed and weather to reddish or greenish colors. The fresh gray to
Chuar_Group
Geologic formation in the eastern United States
Martinsburg is defined as a gray to dark gray, and infrequently tan and purple shale and slate. Local members of impure sandstone; thin, argillaceous limestone
Martinsburg_Formation
Geologic formation in West Virginia, United States
Mississippian-age Mauch Chunk Group. A pronounced unconformity separates the upper boundary of the Bluestone Formation from sandstones of the overlying Pennsylvanian-age
Bluestone_Formation
Large carbonate geologic unit in midwestern USA
village of Grand Eddy, on the Mississippi River. The formation is gray to greenish gray, silty with chert inclusions, thin-bedded, very hard limestone.
Hunton_Megagroup
Geological formation in Canada
composed of laminated dark-gray silty sandstones which weathers to a rusty-brown, alongside thin to medium-bedded sandstones containing minor black shales
Renews_Head_Formation
United States historic place
Grays Armory is a historic building in Cleveland, Ohio. It was built by the Cleveland Grays, a private military company which was founded in 1837. This
Grays_Armory
Geological group in the Colombian Andes
These sandstones are intercalated with thick layers of fissile claystones with common calcareous sandstone concretions. Sediments of the Honda Group restrict
Honda_Group,_Colombia
Fossiliferous statigraphic unit
Cambrian Period. In Maryland it is described as "Interbedded light gray to yellowish-gray, thin- to thick-bedded dolomite and limestone; some shale layers;
Tomstown_Dolomite
Geologic formation in the eastern US
Chilhowee Group. This formation is found above the Weverton Formation and is around 2000–2750 feet in thickness. This formation contains gray phyllite
Catoctin_Formation
A carbonate unit in the Appalachian Basin and Cincinnati arch
unconformably over the Knox Supergroup to the south and the St. Peter Sandstone to the north. The Wells Creek correlates with several different formations
Wells_Creek_Dolomite
Geologic formation (shale) in Montana, Wyoming, and other states
Hayden, F.V. in 1862 to the gray marine shales, often chalky in the middle layers, lying above the terrestrial Dakota Sandstone and usually below the massive
Benton_Shale
Species of lichen-forming fungus
in 1991 from specimens collected on sandstone at Dakota Ridge in Colorado. It forms a conspicuously rough, ashy gray crust made up of tightly packed, angular
Staurothele_rugosa
Geologic formation in the United States
Member At Lake Erie the Wanakah is a medium gray shale. Moving eastward he unit grades eastward into dark gray to black shales in the western Finger Lakes
Ludlowville_Formation
Rock formation in the USA
Eagle sandstone unit in the Appalachian Mountains. It is often abbreviated Or on geologic maps. The Reedsville Formation is an olive-gray to dark-gray siltstone
Reedsville_Formation
Aspect of geology
reddish sandstone and siltstone. Brady Canyon is a cliff-forming gray limestone with some chert. Wood Ranch is a slope-forming pale red and gray siltstone
Geology of the Grand Canyon area
Geology_of_the_Grand_Canyon_area
Geologic formation in the United States
contain partings of claystone or Mudstone. It can range in color from light-gray to chocolate brown, or even or purplish-black. Beds of pink crinoid remains
St Clair Limestone (geologic formation)
St_Clair_Limestone_(geologic_formation)
Mapped bedrock in the United States
Hasson and Dennison (1978) state "The Harrell Shale consists of very dark gray, thinly laminated, platy- to sheety-weathering shale underlain in certain
Harrell_Shale
GRAY SANDSTONE-GROUP
GRAY SANDSTONE-GROUP
GRAY SANDSTONE-GROUP
GRAY SANDSTONE-GROUP
GRAY SANDSTONE-GROUP
GRAY SANDSTONE-GROUP
GRAY SANDSTONE-GROUP
GRAY SANDSTONE-GROUP
GRAY SANDSTONE-GROUP