Flint is a hard, sedimentarycryptocrystalline form of the mineralquartz, categorized as a variety of chert. It occurs chiefly as nodules and masses in sedimentary rocks, such as chalks and limestones. Inside the nodule, flint is usually dark grey, black, green, white or brown in colour, and often has a glassy or waxy appearance. A thin layer on the outside of the nodules is usually different in colour, typically white and rough in texture. From a petrological point of view, "flint" refers specifically to the form of chert which occurs in chalk or marly limestone. Similarly, "common chert" (sometimes referred to simply as "chert") occurs in limestone.
The exact mode of formation of flint is not yet clear but it is thought that it occurs as a result of chemical changes in compressed sedimentary rock formations, during the process of diagenesis. One hypothesis is that a gelatinous material fills cavities in the sediment, such as holes bored by crustaceans or molluscs and that this becomes silicified. This hypothesis certainly explains the complex shapes of flint nodules that are found. The source of dissolved silica in the porous media could be the spicules of silicious sponges. Certain types of flint, such as that from the south coast of England, contain trapped fossilised marine flora. Pieces of coral and vegetation have been found preserved like amber inside the flint. Thin slices of the stone often reveal this effect.
Baggage cannot be checked at this location; however, up to two suitcases in addition to any "personal items" such as briefcases, purses, laptop bags, and infant equipment are allowed on board as carry-ons.
This is at least the fourth station along the Grand Trunk Western Railroad (GTW) line through Flint. The railroad arrived from Port Huron in 1871 and originally a wooden structure served as the passenger station. A 1905 stone and brick station was moved to Muskegon in 1927. The third GTW depot, located at 120 East 14th Street, was used by Amtrak until 1989 and demolished thereafter. The current station on Dort Highway provides easy access to I-69.
In ecology, a community or biocoenosis is an assemblage or association of populations of two or more different species occupying the same geographical area and in a particular time. The term community has a variety of uses. In its simplest form it refers to groups of organisms in a specific place or time, for example, "the fish community of Lake Ontario before industrialization".
The fourth season of the television comedy series Community premiered on February 7, 2013 and concluded on May 9, 2013. The season consists of 13 episodes and aired on NBC on Thursdays at 8:00 pm ET as part of the network's "Comedy Night Done Right" programming block.
The season marked the departure of showrunner Dan Harmon and overall received mixed reviews from critics. In the series's fifth season, Harmon returned as showrunner.
Yerevan is treated separately and granted special administrative status as the country's capital. The chief executive in each of 10 marzer is the marzpet, appointed by the government of Armenia. In Yerevan, the chief executive is the mayor, appointed by the president.
First-level administrative entities
The following is a list of the regions with population, area, and density information. Figures are from the National Statistical Service of the Republic of Armenia. Note that the area of the Gegharkunik Province includes Lake Sevan which covers 1,278 square kilometres (493sqmi) of its territory. To sort the information, use the arrow devices in the table headings.
Within each province are communities (hamaynkner, singular hamaynk). Each community is self-governing and consists of one or more settlements (bnakavayrer, singular bnakavayr). Settlements are classified as either towns (kaghakner, singular kaghak) or villages (gyugher, singular gyugh). As of 2007, Armenia includes 915 communities, of which 49 are considered urban and 866 are considered rural. The capital, Yerevan, also has the status of a community. Additionally, Yerevan is divided into twelve semi-autonomous districts.