AREA IN
... The area Hølonda-Horg and vicinity has been one of the most intricate in norwegian geology, and for thes'e reasons: First, the beds in the Horg syncline are steep ly inclined and partly inverted, t-he chronological order of deposition not being immediately apparent. According to the dip of the beds ...
... The area Hølonda-Horg and vicinity has been one of the most intricate in norwegian geology, and for thes'e reasons: First, the beds in the Horg syncline are steep ly inclined and partly inverted, t-he chronological order of deposition not being immediately apparent. According to the dip of the beds ...
Bulletin 26: Geology of the Gran Quivira Quadrangle, New Mexico
... varying degrees of resistance to erosion, and consequently the surface consists of alternating ridges and valleys. This condi tion is especially characteristic of the area west and southwest of Abo. Closer to the Chupadera Mesa escarpment the strata have in places been dissected into small erosion r ...
... varying degrees of resistance to erosion, and consequently the surface consists of alternating ridges and valleys. This condi tion is especially characteristic of the area west and southwest of Abo. Closer to the Chupadera Mesa escarpment the strata have in places been dissected into small erosion r ...
I. Knight - Department of Natural Resources
... excavated by erosion of the relatively soft Carboniferous strata. Some spectacular eskers occur from Harrys Brook to Black Duck. ...
... excavated by erosion of the relatively soft Carboniferous strata. Some spectacular eskers occur from Harrys Brook to Black Duck. ...
−−Loose to very well consolidated gravel, sand,
... recent work by Sarna−Wojcicki and others (1991) indicates that the formation contains ash both about 435,000 and 740,000 years old. Merced Formation is about 1525 m thick in the sea cliffS north of Mussel Rock −−Predominantly gray and greenish−gray to buff fine−grained sandstone, siltstone, and muds ...
... recent work by Sarna−Wojcicki and others (1991) indicates that the formation contains ash both about 435,000 and 740,000 years old. Merced Formation is about 1525 m thick in the sea cliffS north of Mussel Rock −−Predominantly gray and greenish−gray to buff fine−grained sandstone, siltstone, and muds ...
GEOLOGIC MAP OF THE LIVINGSTON 30` x 60` QUADRANGLE
... quadrangle confirm what Parsons (1942) described: that the volcanic rocks overlie the Judith River Formation and that the upper part interfingers with the Hell Creek Formation. Like Weed and Parsons, du Bray and others (1994) also included these volcanic rocks in what is now called the Livingston Gr ...
... quadrangle confirm what Parsons (1942) described: that the volcanic rocks overlie the Judith River Formation and that the upper part interfingers with the Hell Creek Formation. Like Weed and Parsons, du Bray and others (1994) also included these volcanic rocks in what is now called the Livingston Gr ...
TABLE I. ROCKS OF THE CENTRAL PELON CILLO MOUNTAINS
... Lower member mostly thin-bedded to medium-bedded light-gray limestone, with some thin shale interbeds and some beds of dark-gray limestone, about 100 feet thick. Middle member consists of dark-gray to black fine-grained limestone, with abundant black chert in nodules and layers. Crinoidal remains ar ...
... Lower member mostly thin-bedded to medium-bedded light-gray limestone, with some thin shale interbeds and some beds of dark-gray limestone, about 100 feet thick. Middle member consists of dark-gray to black fine-grained limestone, with abundant black chert in nodules and layers. Crinoidal remains ar ...
Mudstone and shale
... siliciclastic and carbonate materials – can form in many marine environments, but are commonly deep-water. Lead a better life when metamorphosed into spectacular calcpelites. ...
... siliciclastic and carbonate materials – can form in many marine environments, but are commonly deep-water. Lead a better life when metamorphosed into spectacular calcpelites. ...
22Feb05_lec
... siliciclastic and carbonate materials – can form in many marine environments, but are commonly deep-water. Lead a better life when metamorphosed into spectacular calcpelites. ...
... siliciclastic and carbonate materials – can form in many marine environments, but are commonly deep-water. Lead a better life when metamorphosed into spectacular calcpelites. ...
Osage Cuestas: Rocks and Minerals
... Common Rocks and Minerals Sandstone.—Like sand, sandstone is made up largely of quartz grains, which are held together by some natural cement such as calcium carbonate, iron oxide, or silica. It is a common sedimentary rock in Kansas. In eastern Kansas, sandstone is often interbedded with shale and ...
... Common Rocks and Minerals Sandstone.—Like sand, sandstone is made up largely of quartz grains, which are held together by some natural cement such as calcium carbonate, iron oxide, or silica. It is a common sedimentary rock in Kansas. In eastern Kansas, sandstone is often interbedded with shale and ...
Paleozoic, Late Ordovician Period, 450 Million Years ago
... America had reduced the ocean to shallow water bodies that contained very few animals. The Appalachian Mountains were starting to rise along what is now the eastern edge of North America. Rivers were sweeping sediments into the basin that covered this part of Ontario (image). These sediments became ...
... America had reduced the ocean to shallow water bodies that contained very few animals. The Appalachian Mountains were starting to rise along what is now the eastern edge of North America. Rivers were sweeping sediments into the basin that covered this part of Ontario (image). These sediments became ...
Marcellus Formation
Marcellus Formation (also classified as the Marcellus Subgroup of the Hamilton Group, Marcellus Member of the Romney Formation, or simply the Marcellus Shale) is a unit of marine sedimentary rock found in eastern North America. Named for a distinctive outcrop near the village of Marcellus, New York, in the United States,it extends throughout much of the Appalachian Basin.The shale contains largely untapped natural gas reserves, and its proximity to the high-demand markets along the East Coast of the United States makes it an attractive target for energy development and export.Stratigraphically, the Marcellus is the lowest unit of the Devonian age Hamilton Group, and is divided into several sub-units. Although black shale is the dominant lithology, it also contains lighter shales and interbedded limestone layers due to sea level variation during its deposition almost 400 million years ago. The black shale was deposited in relatively deep water devoid of oxygen, and is only sparsely fossiliferous. Most fossils are contained in the limestone members, and the fossil record in these layers provides important paleontological insights on faunal turnovers. The black shales also contain iron ore that was used in the early economic development of the region, and uranium and pyrite which are environmental hazards. The fissile shales are also easily eroded, presenting additional civil and environmental engineering challenges.