Earth impact hazard: Determining the hazard potential of an NEO: …the object is called a potentially hazardous asteroid (PHA). As of 2019 there were about 2,000 identified PHAs. Observations of PHAs are continued until their orbits are refined to the point where their future positions can be reliably predicted.

cinquefoil, (genus Potentilla), genus of more than 300 species of herbaceous flowering plants of the rose family (Rosaceae). The common name, which means “five-leaved,” refers to the number of leaflets in the compound leaf, though some species have three or seven (or more) leaflets. Most of the

cinquefoil: D. fruticosa (formerly P. fruticosa) has provided many dwarf shrubs used in landscaping.

electrochemical reaction: Experimental studies: A third method, called the potentiodynamic, or potential sweep, method involves observations of the current as a function of the potential, while the latter is varied at a constant, known rate.

resistor: …may be called rheostats, or potentiometers.

chemical analysis: Potentiometry: This is the method in which the potential between two electrodes is measured while the electric current (usually nearly zero) between the electrodes is controlled. In the most common forms of potentiometry, two different types of electrodes are used. The potential of the indicator…

titration: Potentiometric titrations involve the measurement of the potential difference between two electrodes of a cell; conductometric titrations, the electrical conductance or resistance; amperometric titrations, the electric current passing during the course of the titration; and coulometric titrations, the total quantity of electricity passed during the

chemical analysis: Potentiometry: This is the method in which the potential between two electrodes is measured while the electric current (usually nearly zero) between the electrodes is controlled. In the most common forms of potentiometry, two different types of electrodes are used. The potential of the indicator…

electrochemical reaction: Experimental studies: …function of time constitutes the potentiostatic method. A third method, called the potentiodynamic, or potential sweep, method involves observations of the current as a function of the potential, while the latter is varied at a constant, known rate.

Potenza, city, capital of Basilicata region, southern Italy, 2,684 ft (819 m) above sea level in the Apennines near the upper Basento River, east of Salerno. The Roman Potentia (founded 2nd century bc), which stood on a lower site than the modern city, was an important road junction and became a

pottery: Faience, or tin-glazed ware: …at Rouen about 1656 by Edme Poterat, introduced a decoration of lambrequins, ornament with a jagged or scalloped outline based on drapery, scrollwork, lacework ornament, and the like. Lambrequins were extremely popular and were copied at other porcelain and faience factories. The faience of Nevers, too, is extremely important and…

podesta, (“power”), in medieval Italian communes, the highest judicial and military magistrate. The office was instituted by the Holy Roman emperor Frederick I Barbarossa in an attempt to govern rebellious Lombard cities. From the end of the 12th century the communes became somewhat more

Andries Hendrik Potgieter was a Boer leader in the Great Trek who took his party from the Cape Colony to settle the Transvaal and became a prominent figure in the early history of that state. Potgieter was a well-to-do sheep farmer from the Tarka district of eastern Cape Colony before the

Everhardus Johannes Potgieter was a Dutch prose writer and poet who tried to set new standards and encourage national consciousness in his journal De gids (“The Guide”), which was founded in 1837, and who anticipated the literary revival of the 1880s. Potgieter was a thoroughgoing Romantic who

pilot whale, (genus Globicephala), either of two species of small, slender toothed whales of the dolphin family Delphinidae. They are characterized by a round bulging forehead, a short beaklike snout, and slender pointed flippers. The short-finned pilot whale (Globicephala macrorhynchus) and the

spice and herb: herb, parts of various plants cultivated for their aromatic, pungent, or otherwise desirable substances. Spices and herbs consist of rhizomes, bulbs, barks, flower buds, stigmas, fruits, seeds, and leaves. They are commonly divided into the categories of spices, spice seeds, and herbs. See also

Kálymnos: The town of Kálymnos, located at the head of an inlet in the southeast, is the chief port and a prominent Aegean commercial centre with the bulk of the island’s population. As in Classical times, sponge fishing remains the chief industry, with the sponge fleet away to the…

Dom Joseph Pothier was a French monk and scholar who, together with his contemporaries, reconstituted the Gregorian chant. Pothier took vows as a Benedictine monk at Solesmes in 1860, was prior of Ligugé in 1893, and in 1898 was appointed abbot of Saint-Wandrille. Soon after he entered Solesmes he

legal profession: Teaching and scholarship: …18th-century teacher, advocate, and judge Robert Joseph Pothier, whose commentaries provided the foundation for the Napoleonic Code of civil law. Much law teaching in the new university law schools that sprang up in the United States, the United Kingdom, and the Commonwealth in the 19th and 20th centuries was initially…

pothos, (Epipremnum aureum), hardy indoor foliage plant of the arum family (Araceae) native to southeastern Asia. It resembles, and thus is often confused with, the common philodendron. Pothos is an evergreen plant with thick, waxy, green, heart-shaped leaves with splashes of yellow. As a

Poti, city, Georgia, on the Black Sea at the mouth of the Rioni River and on the site of the ancient Greek colony of Phasis. The modern city developed in the 1880s, when an artificial harbour and a rail link were built. The city has a fishing fleet, a fish-processing works, and a dredger-building

Piauí: …confluence of the Parnaíba and Poti rivers. The state’s small Atlantic coastline is only about 40 miles (64 km) long.

Gérard Depardieu: Catherine Deneuve in the comedy Potiche (2010).

Alcibiades: They served together at Potidaea (432) in the Chalcidice region, where Alcibiades was defended by Socrates when he was wounded, a debt that he repaid when he stayed to protect Socrates in the flight from the Battle of Delium (424), north of Athens. Yet before he was 30 he…

Bosnia and Herzegovina: Bosnia and Herzegovina under Austro-Hungarian rule: Oskar Potiorek, declared a state of emergency, dissolved the parliament, closed down Serb cultural associations, and suspended the civil courts. The following year the heir to the Habsburg throne, Archduke Franz Ferdinand, traveled to Bosnia and Herzegovina to review a military exercise. He was killed…

Photisarath was a ruler (1520–47) of the Lao kingdom of Lan Xang whose territorial expansion embroiled Laos in the warfare that swept mainland Southeast Asia in the latter half of the 16th century. Photisarath was a pious Buddhist who worked to undermine animism and Brahmanic religious practices

potlatch, ceremonial distribution of property and gifts to affirm or reaffirm social status, as uniquely institutionalized by the Indigenous peoples of the Northwest Pacific coast. The potlatch reached its most elaborate development among the southern Kwakiutl from 1849 to 1925. Although each group

aluminum processing: Smelting: …rows of reduction pots, called potlines, are electrically connected in series. Normal voltages for pots range from four to six volts, and current loads range from 30,000 to 300,000 amperes. From 50 to 250 pots may form a single potline with a total line voltage of more than 1,000 volts.…

Aegean civilizations: Religion: …extant texts refer to a Potnia (“Lady” or “Mistress”), to whom they give several epithets like “horse” or “grain.” Most mainland palaces have paintings of processions in which people bring gifts to a goddess. On Thera, frescoes show girls picking saffron crocus and offering it in baskets to a seated…

Ignacy Potocki was a statesman, political reformer, grand marshal of Lithuania, count, and a member of one of Poland’s oldest aristocratic families. Potocki played a prominent part from 1773 in the Polish Commission of National Education; from 1781 to 1784 he was the grand master of Polish

Stanisław Szczęsny Potocki was a Polish statesman and general during the breakup of the elective Kingdom of Poland. The son of Franciszek Salezy Potocki, palatine of Kiev, of the Tulczyn line of the Potocki family, he entered public service in 1774, became palatine of Russia in 1782, and lieutenant

Wacław Potocki was a Polish poet well known for his epic poetry and for his collection of epigrams. Potocki, a country squire with little formal education, wrote most of his verse (about 300,000 lines) to please himself. A Unitarian, he was given a choice between exile and conversion to Roman

Chaim Potok was an American rabbi and author whose novels introduced to American fiction the spiritual and cultural life of Orthodox Jews. The son of Polish immigrants, Potok was reared in an Orthodox home and attended religious schools. As a young man, he was drawn to the less restrictive

Chaim Potok was an American rabbi and author whose novels introduced to American fiction the spiritual and cultural life of Orthodox Jews. The son of Polish immigrants, Potok was reared in an Orthodox home and attended religious schools. As a young man, he was drawn to the less restrictive

Shepherdstown: The state’s first newspaper, The Potomac Guardian, was published by Nathaniel Willis in the town in 1790. President George Washington reportedly considered it as a possible site for the national capital.

Washington, D.C.: Parks and open spaces: Potomac Park, along the east bank of the Potomac, was created by Congress in 1897, when more than 700 acres (280 hectares) of reclaimed river flatland and tidal reservoirs were set aside for recreation as part of the Army Corps of Engineers’ flood-control project, which…

Potomac River, river in the east central United States, rising in North and South branches in the Appalachian Mountains of West Virginia. The two branches (95 miles [150 km] and 130 miles long [209 km], respectively) flow generally northeast and unite southeast of Cumberland, Maryland, to continue

Ambrose Everett Burnside: …from the command of the Army of the Potomac (Nov. 7, 1862), Burnside (over his own protests) was chosen to replace him. After a crushing defeat at the Battle of Fredericksburg (December), Burnside was replaced by General Joseph Hooker (Jan. 26, 1863). Transferred to Ohio, Burnside helped to crush General…

El Salvador: Languages: …region of the country, and Poton, spoken in the east. After the initial conquest, Spanish became the official language, and the Indigenous dialects slowly fell into disuse. A government effort was made to preserve Nahuatl, but it proved unsuccessful.

potoo, (genus Nyctibius), any of seven species of solitary, nocturnal birds of the American tropics. Its name imitates the wailing cry, “po-TOO,” made by some species. The potoos’ complex patterns of gray, black, and brown plumage resemble tree bark. During the day, the birds sleep, vertically

marsupial: Classification: Family Potoroidae (rat kangaroos, potoroos, and bettongs)10 or so species in 4 genera. Similar to the macropodids but smaller, shorter-footed, and living mainly in undergrowth. Includes potoroos (Potorous) and bettongs (Bettongia). Family Burramyidae (pygmy possums)5

rat kangaroo: The potoroos (Potorous) have shorter tails and ears and pointier faces than other rat kangaroos have. The long-nosed potoroo (P. tridactylus) lives in the underbrush of forests in Tasmania and on the eastern mainland from the border between South Australia and Victoria to southern Queensland. A…

Australia: Principal regimes: …97 million years ago), and Potoroo (the past 97 million years). Each regime, a complex of uniform plate-tectonic and paleoclimatic events at a similar or slowly changing latitude, generated a depositional sequence of distinct facies separated by gaps in deposition.

rat kangaroo: The potoroos (Potorous) have shorter tails and ears and pointier faces than other rat kangaroos have. The long-nosed potoroo (P. tridactylus) lives in the underbrush of forests in Tasmania and on the eastern mainland from the border between South Australia and Victoria to southern Queensland. A…

rat kangaroo: A closely related species, Gilbert’s potoroo (P. gilbertii), of southwestern Australia, was long thought to be extinct, but in the 1990s a tiny population was rediscovered near Albany, Western Australia. Another Western Australian species, the broad-faced potoroo (P. platyops), has been listed as an extinct species on the IUCN…

rat kangaroo: The largest species, the long-footed potoroo (P. longipes), was described in 1980; it is very rare, and the IUCN considers it an endangered species. The long-footed potoroo’s habitat is limited to a handful of forested areas in northeastern Victoria and southeastern New South Wales.

rat kangaroo: The long-nosed potoroo (P. tridactylus) lives in the underbrush of forests in Tasmania and on the eastern mainland from the border between South Australia and Victoria to southern Queensland. A closely related species, Gilbert’s potoroo (P. gilbertii), of southwestern Australia, was long thought to be extinct,…

kinkajou, (Potos flavus), an unusual member of the raccoon family (see procyonid) distinguished by its long, prehensile tail, short muzzle, and low-set, rounded ears. Native to Central America and parts of South America, the kinkajou is an agile denizen of the upper canopy of tropical forests. The

Potosí, city, southern Bolivia, 56 miles (90 km) southwest of Sucre. One of the world’s highest cities (elevation 13,290 feet [4,050 metres]), it stands on a cold and barren plateau in the shadow of fabled Potosí Mountain (also called Cerro Rico [“Rich Mountain”]), which is honeycombed with

Potosí: …in the shadow of fabled Potosí Mountain (also called Cerro Rico [“Rich Mountain”]), which is honeycombed with thousands of mines. Legend attributes its name to potojchi or potocsi, a Quechua word meaning “deafening noise,” or “crash.”

Ernestine Rose was a Polish-born American reformer and suffragist, an active figure in the 19th-century women’s rights, antislavery, and temperance movements. Born in the Polish ghetto to the town rabbi and his wife, Ernestine Potowski received a better education and more freedom than was typical

Ernestine Rose was a Polish-born American reformer and suffragist, an active figure in the 19th-century women’s rights, antislavery, and temperance movements. Born in the Polish ghetto to the town rabbi and his wife, Ernestine Potowski received a better education and more freedom than was typical

potpourri, in pottery, a decorative ceramic vessel with a perforated cover originally made to hold a moist mixture of aromatic spices, fruits, and the petals of flowers that was intended to produce a pleasant scent as the mixture mouldered. The vessel was later used for dried spices and petals.

Potrerillos, former mining centre in northern Chile. The defunct underground copper mine lies in the Atacama Desert, 9,440 feet (2,877 metres) above sea level and 75 miles (120 km) inland from the port of Chañaral. Although its deposits were smaller and its ores of poorer quality than those at

Aleksandr Nikolayevich Potresov was a Russian Social Democrat, one of the leaders of the Mensheviks, who opposed the Bolsheviks in the political struggle leading up to the Russian Revolution of 1917. Potresov, the son of a general, joined the Marxists in the early 1890s and was briefly exiled in

Iceland: Political developments: …banged kitchenware, igniting the “Pots and Pans Revolution.” In April 2010 a special investigative commission examining the financial sector collapse issued a report that revealed an array of dubious business practices and concluded that both banks and prominent individuals had speculated in the stock market with borrowed funds. Following…

Potsdam, village and town (township), St. Lawrence county, northern New York, U.S., on the Raquette River, 30 miles (48 km) east of Ogdensburg. The village was settled in 1803–04 as a cooperative community (disbanded 1810). The State University of New York College at Potsdam (founded 1816 as St.

Potsdam, city, capital of Brandenburg Land (state), eastern Germany. Lying on the southwest border of Berlin, it is sited where the Nuthe River flows into the Havel River, the confluence becoming a series of lakes. First mentioned in 993 as a Slavic settlement known as Poztupimi, it received its

Potsdam Conference, (July 17–August 2, 1945), Allied conference of World War II held at Potsdam, a suburb of Berlin. The chief participants were U.S. President Harry S. Truman, British Prime Minister Winston Churchill (or Clement Attlee, who became prime minister during the conference), and Soviet

Potsdam Declaration, ultimatum issued by the United States, Great Britain, and China on July 26, 1945, calling for the unconditional surrender of Japan. The declaration was made at the Potsdam Conference near the end of World War II. Two months after Germany surrendered, Allied leaders gathered in

Frederick William: Later policies.: …with the issuance of the Edict of Potsdam on Nov. 8, 1685, in which he granted asylum to all Huguenots expelled from France by Louis XIV after the revocation of the Edict of Nantes. Thus, at the end of his life, the Great Elector returned to the political ties of…

Germany: Architecture of Germany: After unification the long-deserted Potsdamer Platz in the heart of Berlin, once a focus of Berlin’s economic and administrative life, came alive with the construction of an array of public and private buildings by internationally renowned architects such as Renzo Piano, Helmut Jahn, and Richard Rogers. After somewhat acrimonious…

Pott disease, disease caused by infection of the spinal column, or vertebral column, by the tuberculosis bacillus, Mycobacterium tuberculosis. Pott disease is characterized by softening and collapse of the vertebrae, often resulting in a hunchback curvature of the spine. The condition is named

Bélep Islands: Comprising Pott and Art islands and several islets, the group lies within the northern continuation of the barrier reef that surrounds the main island of New Caledonia. The chief settlement is Wala, on Art Island. The largest of the group, Art Island is 10 miles (16…

August Pott was a German linguist who was one of the founders of Indo-European historical linguistics. He established modern etymological studies on the basis of the correspondence of sounds occurring in related words in Indo-European languages. As a theology student at the University of Göttingen,

August Pott was a German linguist who was one of the founders of Indo-European historical linguistics. He established modern etymological studies on the basis of the correspondence of sounds occurring in related words in Indo-European languages. As a theology student at the University of Göttingen,

Sir Percivall Pott was an English surgeon noted for his many insightful and comprehensive surgical writings. He was the first to associate cancer with occupational exposure. Pott, whose father died when he was a young boy, was raised under the care of his mother and a relative, Joseph Wilcocks, the

Pottawatomie Massacre, (May 24–25, 1856), murder of five men from a proslavery settlement on Pottawatomie Creek, Franklin county, Kan., U.S., by an antislavery party led by the abolitionist John Brown and composed largely of men of his family. The victims were associated with the Franklin County

commercial fishing: Potters: These are generally inshore vessels using pots or traps to catch shellfish. They come in a wide variety of types and sizes, but a typical inshore potter is 10 metres in length. King crab potters working off of the coast of Alaska are up…

Potter, county, northern Pennsylvania, U.S., bordering New York state to the north. It consists of a mountainous region on the Allegheny Plateau drained by the Allegheny, Cowanesque, and Genesee rivers and Oswayo, Pine, Kettle, and Sinnemahoning creeks. The county contains more than 390 square

wasp: The potter, or mason, wasps (subfamily Eumeninae) of the Vespidae build nests of mud, which are sometimes vaselike or juglike and may be found attached to twigs or other objects.

potter’s mark, device for the purpose of identifying commercial pottery wares. Except for those of Wedgwood, stonewares before the 20th century were not often marked. On some earthenware, potters’ marks are frequently seen, but signatures are rare. One of the few found on ancient Greek vases reads:

agenesis: In renal agenesis, or Potter’s syndrome (absence of one or both kidneys), the ureters also are usually absent, and sex organs may be abnormal. Affected children have wide-set eyes, large, low-set ears, and flattened nose. Agenesis of the lung may be unilateral, a relatively common defect, or bilateral, the…

Aegean civilizations: Period of the Early Palaces in Crete (c. 2000–1700): The fast potter’s wheel began to come into use in Crete about the same time as in the Cyclades and on the mainland. Meanwhile, a revolution in the style of Cretan pottery was taking place. During the Early Bronze Age most of the finer vases everywhere in…

Beatrix Potter was an English author of children’s books, who created Peter Rabbit, Jeremy Fisher, Jemima Puddle-Duck, Mrs. Tiggy-Winkle, and other animal characters. Potter, the only daughter of heirs to cotton fortunes, spent a solitary childhood, enlivened by long holidays in Scotland or the

Bessie Potter Vonnoh was an American sculptor known for her delicate portrayals in bronze of mothers and children and young women. Her Impressionistic style and intimate designs set her apart from other sculptors of her generation. After the death of her father, the Potter family moved from St.

Western architecture: United States: …and completed in 1875, by Edward T. Potter, a pupil of Upjohn. The banded and pointed arches of this building suggest the influence of Ruskin. More successful—and controversial—as an exponent of the Ruskinian aesthetic was Peter B. Wight, architect of the National Academy of Design, New York City (1863–65). There…

H.C. Potter was an American film and stage director who was best known for his comedies, notably The Farmer’s Daughter (1947) and Mr. Blandings Builds His Dream House (1948). After studying in Yale University’s drama department, Potter helped found (1927) the Hampton Players, a summer theatre group

H.C. Potter was an American film and stage director who was best known for his comedies, notably The Farmer’s Daughter (1947) and Mr. Blandings Builds His Dream House (1948). After studying in Yale University’s drama department, Potter helped found (1927) the Hampton Players, a summer theatre group

Harry Potter, fictional character, a boy wizard created by British author J.K. Rowling. His coming-of-age exploits are the subject of seven enormously popular novels (1997–2007), which were adapted into eight films (2001–11); a play and a book of its script appeared in 2016. Harry Potter was first

Beatrix Potter was an English author of children’s books, who created Peter Rabbit, Jeremy Fisher, Jemima Puddle-Duck, Mrs. Tiggy-Winkle, and other animal characters. Potter, the only daughter of heirs to cotton fortunes, spent a solitary childhood, enlivened by long holidays in Scotland or the

H.C. Potter was an American film and stage director who was best known for his comedies, notably The Farmer’s Daughter (1947) and Mr. Blandings Builds His Dream House (1948). After studying in Yale University’s drama department, Potter helped found (1927) the Hampton Players, a summer theatre group

Sidney and Beatrice Webb: Early life of Beatrice Potter Webb.: Beatrice Potter was born in Gloucester, into a class which, to use her own words, “habitually gave orders.” She was the eighth daughter of Richard Potter, a businessman, at whose death she inherited a private income of £1,000 a year, and Laurencina Heyworth, daughter of…

Paulus Potter was a Dutch painter and etcher celebrated chiefly for his paintings of animals. Animals appear prominently in all of Potter’s works, sometimes singly but usually in small groups silhouetted against the sky, or in greater numbers with peasant figures and rustic buildings in an

Paulus Potter was a Dutch painter and etcher celebrated chiefly for his paintings of animals. Animals appear prominently in all of Potter’s works, sometimes singly but usually in small groups silhouetted against the sky, or in greater numbers with peasant figures and rustic buildings in an

Paulus Potter was a Dutch painter and etcher celebrated chiefly for his paintings of animals. Animals appear prominently in all of Potter’s works, sometimes singly but usually in small groups silhouetted against the sky, or in greater numbers with peasant figures and rustic buildings in an

the Potteries, region in the north of the geographic county of Staffordshire, England, traditionally the country’s main producer of china and earthenware. It is centered on the city and unitary authority of Stoke-on-Trent and includes areas in the neighboring borough of Newcastle-under-Lyme.

Michael Shannon: Playing Elvis, Estragon, and George Jones: …films as the Christmas movie Pottersville (2017) and the hit murder-mystery Knives Out (2019).

Heavy Metal: science-fiction anthology film directed by Gerald Potterton and released in 1981. The film features stories that originally appeared in Heavy Metal magazine, as well as tales conceived specifically for the film. Aimed at an adult audience, Heavy Metal was hailed as an impressive foray into film animation and inspired a…

pottery, one of the oldest and most widespread of the decorative arts, consisting of objects made of clay and hardened with heat. The objects made are commonly useful ones, such as vessels for holding liquids or plates or bowls from which food can be served. Clay, the basic material of pottery, has

percussion instrument: Membranophones: …lacings, whether they were small pottery drums, such as those excavated in Costa Rica, or the large footed drums of Mexico. Slender pottery drums of the Guatemala highlands, open top and bottom, can be dated to the late Classical period (c. 700–1000). Skeletons of wooden cylinder drums, very shallow, have…

potter’s mark, device for the purpose of identifying commercial pottery wares. Except for those of Wedgwood, stonewares before the 20th century were not often marked. On some earthenware, potters’ marks are frequently seen, but signatures are rare. One of the few found on ancient Greek vases reads:

diplomatics: Post-Renaissance scholarship: …of the papal chancery, while August Potthast covered the period from 1198 to 1304. Prominent scholars in the research of papal records in Germany at the beginning of the 20th century were Michael Tangl, Rudolf von Heckel, and, particularly, Paul Fridolin Kehr. In comparison with the amount of work done…

China: The first Opium War and its aftermath: Elliot’s successor, Henry Pottinger, arrived at Macau in August and campaigned northward, seizing Xiamen (Amoy), Dinghai, and Ningbo. Reinforced from India, he resumed action in May 1842 and took Wusong, Shanghai, and Zhenjiang. Nanjing yielded in August, and peace was restored with the Treaty of Nanjing. According…

Frederick A. Pottle was an American scholar who became the foremost authority on the 18th-century English biographer James Boswell. Pottle graduated from Colby College in 1917 and earned a Ph.D. from Yale University in 1925. He taught at Yale from 1925 until his retirement in 1966, becoming a full

Frederick A. Pottle was an American scholar who became the foremost authority on the 18th-century English biographer James Boswell. Pottle graduated from Colby College in 1917 and earned a Ph.D. from Yale University in 1925. He taught at Yale from 1925 until his retirement in 1966, becoming a full

potto, (Perodicticus potto), slow-moving tropical African primate. The potto is a nocturnal tree dweller found in rainforests from Sierra Leone eastward to Uganda. It has a strong grip and clings tightly to branches, but when necessary it can also move quickly through the branches with a smooth

Pottstown, borough (town), Montgomery county, southeastern Pennsylvania, U.S., on the Schuylkill River, 37 miles (59 km) northwest of Philadelphia. The region’s first iron forge (known as Pool) was erected there (1716) by Thomas Rutter, and the Coventry forge produced the first commercial steel in

Pottsville, city, seat (1851) of Schuylkill county, east-central Pennsylvania, U.S. It is situated at the gap of the Schuylkill River through Sharp Mountain, on the southern edge of the Pennsylvania anthracite-coal region, 35 miles (56 km) northwest of Reading. The first settlers were massacred

Pottsville Series, in geology, division of the Late Carboniferous Epoch (318 million to 299 million years ago). It was named for exposures studied in the region of Pottsville, in the anthracite coal district of Pennsylvania. Found from Pennsylvania to Ohio and from Maryland to Virginia, the