Misplaced Pages

#712287

20-670: Laurel Ridge may refer to: Laurel Hill (Pennsylvania) , also known as Laurel Ridge or Laurel Mountain , a mountain in Pennsylvania Laurel Ridge State Park , in Pennsylvania Laurel Ridge (plantation) , in Iberville Parish, Louisiana [REDACTED] Topics referred to by the same term This disambiguation page lists articles about distinct geographical locations with

40-469: A diversity of habitats, and with that comes a variety of birds and mammals. Ravens and wild turkeys are frequently seen, while the hermit thrush , Canada warbler , brown creeper , and winter wren all nest near the bog at Spruce Flats. During the summer, black-throated blue warblers, blue-headed and red-eyed vireos can be seen. Raptors on the mountain include the broad-winged, red-tailed and red-shouldered hawks, and barred owls. Commonly seen mammals on

60-481: A few hundred thousand years. The Pennsylvanian is named after the U.S. state of Pennsylvania , where the coal beds of this age are widespread. The division between Pennsylvanian and Mississippian comes from North American stratigraphy. In North America, where the early Carboniferous beds are primarily marine limestones , the Pennsylvanian was in the past treated as a full-fledged geologic period between

80-744: The Burgoon , Mauch Chunk , Pottsville , and Allegheny . The mountain is anticlinal in structure . Along the length of this ridge there are several prominent knobs that rise from the ridgeline. They are as follows south to north: Sugarloaf Knob 2,667 ft (813 m), Highpoint 2,994 ft (913 m), Birch Rock Hill 2,934 ft (894 m), Painter Rock Hill 2,920 ft (890 m), Bald Knob 2,930 ft (890 m), Ulery Hill 2,820 ft (860 m), Pea Vine Hill 2,900 ft (880 m), Pikes Peak 2,840 ft (870 m), Mystery Hill 2,880 ft (880 m), and Sugar Camp Hill 2,908 ft (886 m). The Laurel Hill region shares

100-613: The ICS geologic timescale , the younger of two subperiods of the Carboniferous Period (or the upper of two subsystems of the Carboniferous System). It lasted from roughly 323.2  million years ago  to 298.9  million years ago . As with most other geochronologic units, the rock beds that define the Pennsylvanian are well identified, but the exact date of the start and end are uncertain by

120-714: The Youghiogheny Gorge , both water gaps being approximately 1,700 ft (520 m) in depth. The ridge continues north of the Conemaugh Gorge for several miles as Rager Mountain, which reaches an elevation of 2,580 feet (790 m). South of the Youghiogheny Gorge, a short ridge, generally still labeled Laurel Hill, at the edge of Ohiopyle State Park, reaches above 2,920 feet (890 m). The industrial city of Johnstown and historic borough of Ligonier are located near its northern end, while

140-525: The end of the Permian , during which their cynodont descendants became smaller and nocturnal , as the reptilian archosaurs took over, although dicynodonts would remain megafaunal until their extinction at the end of the Triassic . Most pre-rainforest collapse tetrapods remained smaller, probably due to the land being primarily occupied by the gigantic millipedes, scorpions, and flying insects. After

160-820: The Gzhelian plus the uppermost Kasimovian. The Missourian or Monongahela corresponds to the rest of the Kasimovian. The Desmoinesian or Allegheny corresponds to the upper half of the Moscovian. The Atokan or upper Pottsville corresponds to the lower half of the Moscovian. The Morrowan corresponds to the Bashkirian. In the European subdivision, the Carboniferous is divided into two epochs: Dinantian (early) and Silesian (late). The Silesian starts earlier than

180-707: The Mississippian and the Permian . In parts of Europe, the Mississippian and Pennsylvanian are one more-or-less continuous sequence of lowland continental deposits and are grouped together as the Carboniferous Period. The current internationally used geologic timescale of the ICS gives the Mississippian and Pennsylvanian the rank of subperiods, subdivisions of the Carboniferous Period. All modern classes of fungi have been found in rocks of Pennsylvanian age. The major forms of life at this time were

200-534: The arthropods. Arthropods were far larger than modern ones. Arthropleura , a giant millipede , was a common sight and the giant griffinfly Meganeura "flew the skies". It is commonly considered that is because of high oxygen level, however some of those large arthropod records are also known from period with relatively low oxygen, which suggest high oxygen pressure may not have been a primary reason for their gigantism. Amphibians were diverse and common; some were several meters long as adults. The collapse of

220-428: The earliest sauropsid reptiles ( Hylonomus ), and the earliest known " pelycosaur " synapsids ( Archaeothyris ). Small lizard-like animals quickly gave rise to many descendants. Amniotes underwent a major evolutionary radiation, in response to the drier climate that followed the rainforest collapse . For some reason, pelycosaurs were able to reach larger sizes before reptiles could, and this trend continued until

SECTION 10

#1732772707713

240-708: The following proclamation: “ ..whereas the Province of Pennsylvania has unduly laid claim to … His Majesty’s territory…. I do hereby in His Majesty’s name require & command all of His Majesty’s subjects West of Laurel Hill to pay a due respect to my Proclamation, strictly prohibiting the authority of Pennsylvania at their peril.” [1] Two state forests, comprising over 22,000 acres (89 km ), are located on Laurel Hill: Gallitzin State Forest and Forbes State Forest . State Game Lands 42 and 111 are also located on

260-497: The humid continental climate of the Mid-Atlantic region in which it is located. The mountain ridge is oriented at right angles to approaching weather systems, forcing prevailing westerly airflows upward. As rising air cools, moisture in the air mass condenses; once reaching the saturation point, precipitation results. Laurel Hill may also act as a barrier to weather systems and slow the movement of storms, which has an impact on

280-542: The local area and forms a microclimate . Although the mountain is not high enough to create its own weather, its orography is enough to gently nudge weather from hot to warm, cool to cold, and from rain to snow; along with moisture from the Great Lakes , the latter can result in heavy snowfall during winter months. The mountain ridge can be 5 to 10 °F (−15 to −12 °C) cooler than surrounding towns and valleys, depending on other weather variables. Laurel Hill has

300-576: The mountain and also comprise a little over 22,000 acres (89 km ). Laurel Hill has an average elevation of 2,700 ft (820 m) along its length, while there are individual "knobs" that rise above 2,900 ft (880 m). The highest point is located above the Seven Springs Mountain Resort at 2,994 ft (913 m). Laurel Hill is flanked on its north end by the Conemaugh Gorge and on its south end by

320-699: The mountain include white-tailed deer , chipmunks, and red and gray squirrels. More elusive animals include the woodchuck , raccoon , and opossum . Black bear have also been seen, but are shy and reclusive and not likely to be encountered. Snakes including the timber rattlesnake and eastern copperhead also make their home on Laurel Hill around rocks and scree areas. 40°9′39″N 79°9′52″W  /  40.16083°N 79.16444°W  / 40.16083; -79.16444 Pennsylvanian (geology) The Pennsylvanian ( / ˌ p ɛ n s əl ˈ v eɪ n i . ən / pen-səl- VAYN -i-ən , also known as Upper Carboniferous or Late Carboniferous ) is, on

340-492: The rainforest collapse, the giant arthropods disappeared, allowing amniote tetrapods to achieve larger sizes. The Pennsylvanian has been variously subdivided. The international timescale of the ICS follows the Russian subdivision into four stages: North American subdivision is into five stages, but not precisely the same, with additional (older) Appalachian series names following: The Virgilian or Conemaugh corresponds to

360-489: The rainforest ecology in the mid-Pennsylvanian (between the Moscovian and the Kasimovian) removed many amphibian species that did not survive as well in the cooler, drier conditions. Amniotes, however, prospered due to specific key adaptations. One of the greatest evolutionary innovations of the Carboniferous was the amniote egg, which allowed for the further exploitation of the land by certain tetrapods . These included

380-560: The recreational boroughs of Confluence and Ohiopyle are located towards its southern end. Two major highways cross Laurel Hill, the Pennsylvania Turnpike and U.S. Route 30 . The abandoned Laurel Hill Tunnel goes beneath Laurel Hill. A number of smaller state roads cross at other points on the mountain. Laurel Hill is made up of Mississippian and Pennsylvanian clastic sedimentary rocks , consisting mostly of conglomerate , sandstone , and shale . Formations include

400-548: The same name. If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Laurel_Ridge&oldid=874370153 " Category : Place name disambiguation pages Hidden categories: Short description is different from Wikidata All article disambiguation pages All disambiguation pages Laurel Hill (Pennsylvania) In August of 1774, governor of Virginia John Murray, 4th Earl of Dunmore issued

#712287