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Mont Sainte-Cécile
Mont Sainte-Cécile, also referred to as Petit-Mégantic is a mountain that rises to located in Sainte-Cécile-de-Whitton, Quebec, Canada. Etymology Mont Sainte-Cécile and the eponymous village at its foot were named after Saint Cecilia. Geography The mountain is located in the municipality of Sainte-Cécile-de-Whitton, Quebec in the regional county municipality of Le Granit. It lies in the boundary ranges of the Longfellow Mountains in the Appalachians and on the edge of the Chaudière River valley. Geology Mont Sainte-Cécile is made of granodiorite that dates from the upper Devonian period ( million years ago). To its southeast, where it collects water and drains into the Chaudière River, is the Drolet lens, a clayey till that was settled in the valley during the massive drainage of Glacial Lake Gayhurst when it filled an overdeepening with remnants of glacial lacustrine deposits. Granit is currently being extracted from the eastern flank of the mountain. Wildlif ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lac-Mégantic, Quebec
Lac-Mégantic () is a town in the Eastern Townships region of Quebec, Canada. It is located on Lac Mégantic, a freshwater lake after which the town was named. Situated in the former Frontenac County in the historic Eastern Townships, Lac-Mégantic is the seat of Le Granit Regional County Municipality and of the judicial district of Mégantic. Lac-Mégantic was a tourist destination and a producer of forestry products, furniture, Masonite doors, particleboard, and architectural granite before July 6, 2013, when the Lac-Mégantic rail disaster led to a massive fire and deadly explosion of petroleum tank cars that devastated the downtown and killed 47 people. History Prior to contact with Europeans, the region was inhabited by the Abenaki. Archaeological digs found that the Amerindians had been in the region for over 12,000 years, making this the oldest known site of human occupation in Quebec. The name of Mégantic comes from the Abenaki word "namesokanjik" which translates ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Granodiorite
Granodiorite () is a coarse-grained (phaneritic) intrusive igneous rock similar to granite, but containing more plagioclase feldspar than orthoclase feldspar. The term banatite is sometimes used informally for various rocks ranging from granite to diorite, including granodiorite. Composition According to the QAPF diagram, granodiorite has a greater than 20% quartz by volume, and between 65% and 90% of the feldspar is plagioclase. A greater amount of plagioclase would designate the rock as tonalite. Granodiorite is felsic to intermediate in composition. It is the intrusive igneous equivalent of the extrusive igneous dacite. It contains a large amount of sodium (Na) and calcium (Ca) rich plagioclase, potassium feldspar, quartz, and minor amounts of muscovite mica as the lighter colored mineral components. Biotite and amphiboles often in the form of hornblende are more abundant in granodiorite than in granite, giving it a more distinct two-toned or overall darker appearan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lichen
A lichen ( , ) is a composite organism that arises from algae or cyanobacteria living among filaments of multiple fungi species in a mutualistic relationship.Introduction to Lichens – An Alliance between Kingdoms . University of California Museum of Paleontology. Lichens have properties different from those of their component organisms. They come in many colors, sizes, and forms and are sometimes plant-like, but are not s. They may have tiny, leafless branches (); flat leaf-like structures ( |
Pseudevernia Cladonia
''Pseudevernia'' is a genus of foliose lichens in the family Parmeliaceae. The type species of the genus, ''Pseudevernia furfuracea'' ( commonly known as tree moss), has substantial commercial value in the perfume industry. Systematics ''Pseudevernia'' was circumscribed by German botanist Friedrich Wilhelm Zopf in 1903 with ''Pseudevernia furfuracea'' as the type species. ''Pseudevernia'' is a member of the Hypogymnioid clade of the family Parmeliaceae; this clade, which also includes the genera ''Arctoparmelia'', ''Brodoa'', and ''Hypogymnia'', is an evolutionary lineage comprising species occurring in temperate to subpolar regions in both hemispheres. ''Pseudevernia'' has been estimated to have diverged from its closest ancestors during the Oligocene at 31.43 Ma, and is the earliest-diverging member of the Hypogymnioid clade. Description ''Pseudevernia'' lichens generally have a foliose (leafy) thallus, although occasionally it becomes almost fruticose in form. This i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lacustrine Plain
A lacustrine plain or lake plain is a plain formed due to the past existence of a lake and its accompanying sediment accumulation. Lacustrine plains can be formed through one of three major mechanisms: glacial drainage, differential uplift, and inland lake creation and drainage. Lake plains can have various uses depending on where and how they form. Over time, in regions where a lake once existed, as water drains or evaporates from the lake, the deposited sediments are left behind, resulting in a level plain of land where the lake once existed. The soil of the plain may constitute fertile and productive farmland due to the previous accumulation of lacustrine sediments; in other cases, it may become a wetland or a desert. Background Lacustrine plains are plains formed when lakes filled with sediments are drained. There are several reasons why drainage might occur, but in all cases the water in the lake is lost, leaving behind a level land of sediments. The resulting plain is an a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Overdeepening
Overdeepening is a characteristic of basins and valleys eroded by glaciers. An overdeepened valley profile is often eroded to depths which are hundreds of metres below the deepest continuous line (the thalweg) along a valley or watercourse. This phenomenon is observed under modern day glaciers, in salt-water fjords and fresh-water lakes remaining after glaciers melt, as well as in tunnel valleys which are partially or totally filled with sediment. When the channel produced by a glacier is filled with debris, the subsurface geomorphic structure is found to be erosionally cut into bedrock and subsequently filled by sediments. These overdeepened cuts into bedrock structures can reach a depth of several hundred metres below the valley floor. Overdeepened fjords and lakes have significant economic value as harbours and fisheries. Overdeepened basins and valleys filled with sediment (termed tunnel valleys) are of particular interest to engineers, petroleum geologists, and hydrologists; ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glacial Lake Gayhurst
A glacial period (alternatively glacial or glaciation) is an interval of time (thousands of years) within an ice age that is marked by colder temperatures and glacier advances. Interglacials, on the other hand, are periods of warmer climate between glacial periods. The Last Glacial Period ended about 15,000 years ago. The Holocene is the current interglacial. A time with no glaciers on Earth is considered a greenhouse climate state. Quaternary Period Within the Quaternary, which started about 2.6 million years before present, there have been a number of glacials and interglacials. At least eight glacial cycles have occurred in the last 740,000 years alone. Penultimate Glacial Period The Penultimate Glacial Period (PGP) is the glacial period that occurred before the Last Glacial Period. It began about 194,000 years ago and ended 135,000 years ago, with the beginning of the Eemian interglacial. Last Glacial Period The last glacial period was the most recent glacial period wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Till
image:Geschiebemergel.JPG, Closeup of glacial till. Note that the larger grains (pebbles and gravel) in the till are completely surrounded by the matrix of finer material (silt and sand), and this characteristic, known as ''matrix support'', is diagnostic of till. image:Glacial till exposed in roadcut-750px.jpg, Glacial till with tufts of grass Till or glacial till is unsorted glacier, glacial sediment. Till is derived from the erosion and entrainment of material by the moving ice of a glacier. It is deposited some distance down-ice to form terminal, lateral, medial and ground moraines. Till is classified into primary deposits, laid down directly by glaciers, and secondary deposits, reworked by fluvial transport and other processes. Description Till is a form of '' glacial drift'', which is rock material transported by a glacier and deposited directly from the ice or from running water emerging from the ice. It is distinguished from other forms of drift in that it is depos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lens (geology)
In geology, a lens or lentil is a body of ore or rock that is thick in the middle and thin at the edges, resembling a convex lens in cross-section. To thin out in all directions is to "lens out", also known as "lensing". The adjectives "lenticular" and "lentiform" are used to describe lens-like formations. Lenticle is a synonym for lentil, but may also refer to a fragment of rock that is lens-shaped. "Lenticule" is used for small lentil. A lentil may also refer a minor unit in a formation of rock, similar to a member but not generally spread out over a large geographical area. In this usage, the lentil thins out towards its edges. Lenticular bedding is a special form of rock interbedded mudrock and cross-laminated rippled sandstone Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar (both silicates) . ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chaudière River
The Chaudière River (French for "Cauldron" or "Boiler"; Abenaki: Kik8ntekw) is a river with its source near the Town of Lac-Mégantic, in southeast Quebec, Canada. From its source Lake Mégantic in the Estrie region, it runs northwards to flow into the St. Lawrence River opposite Quebec City. Geography The river's drainage area is , initially in the Appalachian Mountains, then in the low-lands of the St. Lawrence, and include 236 lakes covering and approximately 180,000 inhabitants. Its annual medium flow at the station of Saint-Lambert-de-Lauzon is , varying from (low water) to (spring high water), with historical maximum of . Its principal tributaries are: *Rivière du Loup (not to be confused with Rivière du Loup in the Bas-Saint-Laurent), also known as the Rivière Linière *Famine River *Beaurivage River * Bras Saint-Victor The river's basin has nearly 50 percent of the faunal richness of Quebec, namely 330 out of 653 vertebrate species known in the province ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Longfellow Mountains
The Longfellow Mountains are a subrange of the Appalachian Mountains System, located within the North Maine Woods region of northwestern Maine. They extend across the state from northern New Hampshire northeastward to the Provinces and territories of Canada, Canadian provinces of New Brunswick and Quebec. * In 1959, the Maine Legislature voted to give the various mountains and mountain range, ranges in northwest Maine the collective name of the Longfellow Mountains, in honor of the Maine-born poet Henry Wadsworth Longfellow (1807–1882). This and most of Maine's mountain ranges and mountain peaks are part of the Appalachian Mountains System. See also * List of mountains of Maine * References {{Mountains of Quebec Mountain ranges of Maine Subranges of the Appalachian Mountains North Maine Woods Landforms of Aroostook County, Maine Mountains of Franklin County, Maine Mountains of Oxford County, Maine Mountains of Penobscot County, Maine Mountains of Piscataquis County, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Appalachian Mountains
The Appalachian Mountains, often called the Appalachians, (french: Appalaches), are a system of mountains in eastern to northeastern North America. The Appalachians first formed roughly 480 million years ago during the Ordovician Period. They once reached elevations similar to those of the Alps and the Rocky Mountains before experiencing natural erosion. The Appalachian chain is a barrier to east–west travel, as it forms a series of alternating ridgelines and valleys oriented in opposition to most highways and railroads running east–west. Definitions vary on the precise boundaries of the Appalachians. The United States Geological Survey (USGS) defines the ''Appalachian Highlands'' physiographic division as consisting of 13 provinces: the Atlantic Coast Uplands, Eastern Newfoundland Atlantic, Maritime Acadian Highlands, Maritime Plain, Notre Dame and Mégantic Mountains, Western Newfoundland Mountains, Piedmont, Blue Ridge, Valley and Ridge, St. Lawrence Valley, Appalac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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