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56-574: The meaning of the word Sankamphaeng in the Thai language is fortification or counterfort . It is a fitting name to describe this mountain range that effectively constituted a natural buttress between the Khorat Plateau and the plain of Central Thailand . The mountain chain runs in a WNW-ESE direction. The northern part of the Sankamphaeng mountain range merges with the southern end of

112-623: A dominant language in all aspects of society in Thailand, Thai initially saw gradual and later widespread adoption as a second language among the country's minority ethnic groups from the mid-late Ayutthaya period onward. Ethnic minorities today are predominantly bilingual, speaking Thai alongside their native language or dialect. Standard Thai is classified as one of the Chiang Saen languages—others being Northern Thai , Southern Thai and numerous smaller languages, which together with

168-480: A thin section using a method like the Gazzi-Dickinson Method . This yields the relative percentages of quartz, feldspar, and lithic grains and the amount of clay matrix. The composition of a sandstone can provide important information on the genesis of the sediments when used with a triangular Q uartz, F eldspar, L ithic fragment ( QFL diagrams ). However, geologist have not been able to agree on

224-533: A four-way distinction among stops and affricates . The maximal four-way occurred in labials ( /p pʰ b ʔb/ ) and denti-alveolars ( /t tʰ d ʔd/ ); the three-way distinction among velars ( /k kʰ ɡ/ ) and palatals ( /tɕ tɕʰ dʑ/ ), with the glottalized member of each set apparently missing. The major change between old and modern Thai was due to voicing distinction losses and the concomitant tone split . This may have happened between about 1300 and 1600 CE, possibly occurring at different times in different parts of

280-478: A sandstone goes through as the degree of kinetic processing of the sediments increases. Dott's (1964) sandstone classification scheme is one of many such schemes used by geologists for classifying sandstones. Dott's scheme is a modification of Gilbert's classification of silicate sandstones, and it incorporates R.L. Folk's dual textural and compositional maturity concepts into one classification system. The philosophy behind combining Gilbert's and R. L. Folk's schemes

336-462: A set of boundaries separating regions of the QFL triangle. Visual aids are diagrams that allow geologists to interpret different characteristics of a sandstone. For example, a QFL chart can be marked with a provenance model that shows the likely tectonic origin of sandstones with various compositions of framework grains. Likewise, the stage of textural maturity chart illustrates the different stages that

392-530: A syllable that formerly began with a voiceless consonant (including glottalized stops). An additional complication is that formerly voiceless unaspirated stops/affricates (original /p t k tɕ ʔb ʔd/ ) also caused original tone 1 to lower, but had no such effect on original tones 2 or 3. The above consonant mergers and tone splits account for the complex relationship between spelling and sound in modern Thai. Modern "low"-class consonants were voiced in Old Thai, and

448-445: A twofold classification: Cement is what binds the siliciclastic framework grains together. Cement is a secondary mineral that forms after deposition and during burial of the sandstone. These cementing materials may be either silicate minerals or non-silicate minerals, such as calcite. Sandstone that becomes depleted of its cement binder through weathering gradually becomes friable and unstable. This process can be somewhat reversed by

504-502: Is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains, cemented together by another mineral. Sandstones comprise about 20–25% of all sedimentary rocks . Most sandstone is composed of quartz or feldspar , because they are the most resistant minerals to the weathering processes at the Earth's surface. Like uncemented sand , sandstone may be imparted any color by impurities within

560-837: Is a distinction that can be recognized in the field . In turn, the distinction between an orthoquartzite and a metaquartzite is the onset of recrystallization of existing grains. The dividing line may be placed at the point where strained quartz grains begin to be replaced by new, unstrained, small quartz grains, producing a mortar texture that can be identified in thin sections under a polarizing microscope. With increasing grade of metamorphism, further recrystallization produces foam texture , characterized by polygonal grains meeting at triple junctions, and then porphyroblastic texture , characterized by coarse, irregular grains, including some larger grains ( porphyroblasts .) Sandstone has been used since prehistoric times for construction, decorative art works and tools. It has been widely employed around

616-506: Is based on the register of the educated classes by Central Thai and ethnic minorities in the area along the ring surrounding the Metropolis . In addition to Central Thai, Thailand is home to other related Tai languages . Although most linguists classify these dialects as related but distinct languages, native speakers often identify them as regional variants or dialects of the "same" Thai language, or as "different kinds of Thai". As

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672-507: Is based on the dialect of the central Thai people, and it is written in the Thai script . Hlai languages Kam-Sui languages Kra languages Be language Northern Tai languages Central Tai languages Khamti language Tai Lue language Shan language others Northern Thai language Thai language Southern Thai language Tai Yo language Phuthai language Lao language (PDR Lao, Isan language ) Thai has undergone various historical sound changes. Some of

728-523: Is likely formed during eogenesis. Deeper burial is accompanied by mesogenesis , during which most of the compaction and lithification takes place. Compaction takes place as the sand comes under increasing pressure from overlying sediments. Sediment grains move into more compact arrangements, ductile grains (such as mica grains) are deformed, and pore space is reduced. In addition to this physical compaction, chemical compaction may take place via pressure solution . Points of contact between grains are under

784-431: Is redeposited in the unstrained pore spaces. Mechanical compaction takes place primarily at depths less than 1,000 meters (3,300 ft). Chemical compaction continues to depths of 2,000 meters (6,600 ft), and most cementation takes place at depths of 2,000–5,000 meters (6,600–16,400 ft). Unroofing of buried sandstone is accompanied by telogenesis , the third and final stage of diagenesis. As erosion reduces

840-443: Is that it is better able to "portray the continuous nature of textural variation from mudstone to arenite and from stable to unstable grain composition". Dott's classification scheme is based on the mineralogy of framework grains, and on the type of matrix present in between the framework grains. In this specific classification scheme, Dott has set the boundary between arenite and wackes at 15% matrix. In addition, Dott also breaks up

896-486: Is the language of television, education, news reporting, and all forms of media. A recent research found that the speakers of the Northern Thai language (also known as Phasa Mueang or Kham Mueang) have become so few, as most people in northern Thailand now invariably speak Standard Thai, so that they are now using mostly Central Thai words and only seasoning their speech with the "Kham Mueang" accent. Standard Thai

952-610: The Dong Phaya Yen Mountains , which run roughly in a north-south direction at the southwestern boundary of the Khorat Plateau . To the east this range connects with the Dângrêk Mountains , a longer system running in an east-west direction that stretches into Laos . The southern mountainsides of the range drain into the Prachinburi River . The range is divided in two compact massifs where

1008-766: The Dong Phayayen - Khao Yai Forest Complex , which includes several national parks. This area was inscribed on the UNESCO World Heritage List . Altogether 6,155 km are protected in the complex. Thai language Thai , or Central Thai (historically Siamese ; Thai: ภาษาไทย ), is a Tai language of the Kra–Dai language family spoken by the Central Thai , Mon , Lao Wiang , Phuan people in Central Thailand and

1064-498: The percolation of water and other fluids and are porous enough to store large quantities, making them valuable aquifers and petroleum reservoirs . Quartz-bearing sandstone can be changed into quartzite through metamorphism , usually related to tectonic compression within orogenic belts . Sandstones are clastic in origin (as opposed to either organic , like chalk and coal , or chemical , like gypsum and jasper ). The silicate sand grains from which they form are

1120-423: The 621 TCS Tactical Control Squadron , at the top of Khao Rom , also known as Khao Khiao , the highest summit of the range. In 1982 a road was built that made it easy for Bangkok residents to reach the main protected area of the mountains. The protected areas of the range face problems of encroachment . Homes and residential villas have been built illegally within the limits of officially protected areas of

1176-555: The Khmer system first before the Thai borrowed. Old Thai had a three-way tone distinction on "live syllables" (those not ending in a stop), with no possible distinction on "dead syllables" (those ending in a stop, i.e. either /p/, /t/, /k/ or the glottal stop that automatically closes syllables otherwise ending in a short vowel). There was a two-way voiced vs. voiceless distinction among all fricative and sonorant consonants, and up to

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1232-628: The Northwestern Tai and Lao-Phutai languages, form the Southwestern branch of Tai languages . The Tai languages are a branch of the Kra–Dai language family , which encompasses a large number of indigenous languages spoken in an arc from Hainan and Guangxi south through Laos and Northern Vietnam to the Cambodian border. Standard Thai is the principal language of education and government and spoken throughout Thailand. The standard

1288-616: The Sankamphaeng mountains, of which the Mun River flowing eastwards is the largest. Another important river is the Klong Praprong. Administratively, most of the area of the range is under Prachinburi and Sa Kaeo Provinces , with smaller parts in Nakhon Ratchasima , Nakhon Nayok , and Saraburi Provinces . There are sandstone outcrops in the south and north of the range. Shales and schist are also present. In

1344-491: The Thai-speaking area. All voiced–voiceless pairs of consonants lost the voicing distinction: However, in the process of these mergers, the former distinction of voice was transferred into a new set of tonal distinctions. In essence, every tone in Old Thai split into two new tones, with a lower-pitched tone corresponding to a syllable that formerly began with a voiced consonant, and a higher-pitched tone corresponding to

1400-491: The application of tetraethyl orthosilicate (Si(OC 2 H 5 ) 4 ) which will deposit amorphous silicon dioxide between the sand grains. The reaction is as follows. Pore space includes the open spaces within a rock or a soil. The pore space in a rock has a direct relationship to the porosity and permeability of the rock. The porosity and permeability are directly influenced by the way the sand grains are packed together. Sandstones are typically classified by point-counting

1456-473: The common minerals most resistant to weathering processes at the Earth's surface, as seen in the Goldich dissolution series . Framework grains can be classified into several different categories based on their mineral composition: Matrix is very fine material, which is present within interstitial pore space between the framework grains. The nature of the matrix within the interstitial pore space results in

1512-456: The depositional environment, older sand is buried by younger sediments, and it undergoes diagenesis . This mostly consists of compaction and lithification of the sand. Early stages of diagenesis, described as eogenesis , take place at shallow depths (a few tens of meters) and are characterized by bioturbation and mineralogical changes in the sands, with only slight compaction. The red hematite that gives red bed sandstones their color

1568-407: The depth of burial, renewed exposure to meteoric water produces additional changes to the sandstone, such as dissolution of some of the cement to produce secondary porosity . Framework grains are sand-sized (0.0625-to-2-millimeter (0.00246 to 0.07874 in) diameter) detrital fragments that make up the bulk of a sandstone. Most framework grains are composed of quartz or feldspar , which are

1624-446: The different types of framework grains that can be present in a sandstone into three major categories: quartz, feldspar, and lithic grains. When sandstone is subjected to the great heat and pressure associated with regional metamorphism , the individual quartz grains recrystallize, along with the former cementing material, to form the metamorphic rock called quartzite . Most or all of the original texture and sedimentary structures of

1680-463: The eastern end of the western massif, where there is a valley through which passes Hwy 304 (AH 19), between Kabin Buri town and Nakhon Ratchasima . The eastern massif begins at 992 m high Khao Lamang , 949 m high Phu Sam Ngam , and 843 m high Khao Tap Tao . At this point a branch of the massif extends northeastwards with 748 m high Khao Chawae and 723 m high Khao Plai Lam Katuk , connecting with

1736-560: The forest in Khao Yai and in Thap Lan National Park . Illegal logging is also a problem in the area of the park, the forests of these mountains being among the places in Thailand affected by the logging and smuggling of Phayung (Siamese rosewood) trees. Although officially a protected tree, the cutting and trading of endangered rosewood trees has been going on unabated in Thailand's mountainous forested zones, even in

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1792-433: The greatest strain, and the strained mineral is more soluble than the rest of the grain. As a result, the contact points are dissolved away, allowing the grains to come into closer contact. Lithification follows closely on compaction, as increased temperatures at depth hasten deposition of cement that binds the grains together. Pressure solution contributes to cementing, as the mineral dissolved from strained contact points

1848-442: The hardness of individual grains, uniformity of grain size and friability of their structure, some types of sandstone are excellent materials from which to make grindstones , for sharpening blades and other implements. Non-friable sandstone can be used to make grindstones for grinding grain, e.g., gritstone . A type of pure quartz sandstone, orthoquartzite, with more of 90–95 percent of quartz, has been proposed for nomination to

1904-612: The highest elevations are in the west. The highest point in the Sankamphaeng Range is the 1,351 m high Khao Rom , also known as Khao Khiao. Other peaks are 1,326 m high Khao Laem , 1,313 m high Khao Chan , 1,112 m high Khao Falami , 1,142 m high Khao Sam Yot , 1,052 m high Khao Inthani , 1,071 m high Khao Fa Pha , 1,017 m high Khao Kaeo , 821 m high Khao Salat Dai , 805 m high Khao Samo Pun , 787 m high Khao Laem Noi , and 824 m high Khao Phaeng Ma . Finally, 875 m high Kao Kamphaeng and 558 m high Kao Dan Fai Mai are at

1960-528: The local patois as pronounced in Guangdong Ayutthaya , the old capital of Thailand from 1351 - 1767 A.D., was from the beginning a bilingual society, speaking Thai and Khmer . Bilingualism must have been strengthened and maintained for some time by the great number of Khmer-speaking captives the Thais took from Angkor Thom after their victories in 1369, 1388 and 1431. Gradually toward the end of

2016-491: The minerals, but the most common colors are tan, brown, yellow, red, grey, pink, white, and black. Because sandstone beds can form highly visible cliffs and other topographic features, certain colors of sandstone have become strongly identified with certain regions, such as the red rock deserts of Arches National Park and other areas of the American Southwest . Rock formations composed of sandstone usually allow

2072-551: The most significant changes occurred during the evolution from Old Thai to modern Thai. The Thai writing system has an eight-century history and many of these changes, especially in consonants and tones, are evidenced in the modern orthography . According to a Chinese source, during the Ming dynasty , Yingya Shenglan (1405–1433), Ma Huan reported on the language of the Xiānluó (暹羅) or Ayutthaya Kingdom, saying that it somewhat resembled

2128-493: The much lower temperatures and pressures associated with diagenesis of sedimentary rock, but diagenesis has cemented the rock so thoroughly that microscopic examination is necessary to distinguish it from metamorphic quartzite. The term orthoquartzite is used to distinguish such sedimentary rock from metaquartzite produced by metamorphism. By extension, the term orthoquartzite has occasionally been more generally applied to any quartz-cemented quartz arenite . Orthoquartzite (in

2184-464: The narrow sense) is often 99% SiO 2 with only very minor amounts of iron oxide and trace resistant minerals such as zircon , rutile and magnetite . Although few fossils are normally present, the original texture and sedimentary structures are preserved. The typical distinction between a true orthoquartzite and an ordinary quartz sandstone is that an orthoquartzite is so highly cemented that it will fracture across grains, not around them. This

2240-415: The period, a language shift took place. Khmer fell out of use. Both Thai and Khmer descendants whose great-grand parents or earlier ancestors were bilingual came to use only Thai. In the process of language shift, an abundance of Khmer elements were transferred into Thai and permeated all aspects of the language. Consequently, the Thai of the late Ayutthaya Period which later became Ratanakosin or Bangkok Thai,

2296-546: The plains some 30 km away. In 1932 the tambon status of Khao Yai Subdistrict was cancelled. In 1959, then Prime Minister of Thailand , Marshall Sarit Thanarat , coordinated the Ministry of Agriculture and the Ministry of the Interior in order to initiate a process where areas of the country could be officially set aside as national parks. Khao Yai National Park was subsequently established on 18 September 1962 and

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2352-638: The product of physical and chemical weathering of bedrock. Weathering and erosion are most rapid in areas of high relief, such as volcanic arcs , areas of continental rifting , and orogenic belts . Eroded sand is transported by rivers or by the wind from its source areas to depositional environments where tectonics has created accommodation space for sediments to accumulate. Forearc basins tend to accumulate sand rich in lithic grains and plagioclase . Intracontinental basins and grabens along continental margins are also common environments for deposition of sand. As sediments continue to accumulate in

2408-542: The protected areas such as Thap Lan, Pang Sida, and Ta Phraya National Parks, as well as in the Dong Yai Wildlife Sanctuary. In China this wood is highly valued in the furniture industry and its price has shot up in the last few years. Among the endangered animal species of the range the Sunda pangolin deserves mention. This range, together with the Dong Phaya Yen Mountains further north, forms

2464-492: The royal vocabulary according to their immediate environment. Thai and Pali, the latter from Theravada Buddhism, were added to the vocabulary. An investigation of the Ayutthaya Rajasap reveals that three languages, Thai, Khmer and Khmero-Indic were at work closely both in formulaic expressions and in normal discourse. In fact, Khmero-Indic may be classified in the same category as Khmer because Indic had been adapted to

2520-417: The sandstone are erased by the metamorphism. The grains are so tightly interlocked that when the rock is broken, it fractures through the grains to form an irregular or conchoidal fracture. Geologists had recognized by 1941 that some rocks show the macroscopic characteristics of quartzite, even though they have not undergone metamorphism at high pressure and temperature. These rocks have been subject only to

2576-583: The southern end of the Dong Phaya Yen Range. Further east there are two mountains with the name "Khao Yai", a 776 m high Khao Yai located north of 761 m high Khao Thuang and a 796 m high Khao Yai located to the south. Further eastwards the average height of the peaks descends to around 400 m and Hwy 348 crosses in this lower area from north to south where the range connects with the Dângrêk Mountains. Several rivers originate in

2632-543: The southern side steep slopes made of granite and conglomerates can be seen. Limestone is present towards the eastern end close to the Dangrek Mountains . Around 1922 a group of people from Ban Tha Dan and Ban Tha Chai villages in Nakhon Nayok Province built a settlement in the forest in the western part of these mountains. Up to 30 households cultivated the newly deforested land. The area

2688-535: The terminology "low" reflects the lower tone variants that resulted. Modern "mid"-class consonants were voiceless unaspirated stops or affricates in Old Thai—precisely the class that triggered lowering in original tone 1 but not tones 2 or 3. Modern "high"-class consonants were the remaining voiceless consonants in Old Thai (voiceless fricatives, voiceless sonorants, voiceless aspirated stops). The three most common tone "marks" (the lack of any tone mark, as well as

2744-401: The three tones of Old Thai were split have since merged into five in standard Thai, with the lower variant of former tone 2 merging with the higher variant of former tone 3, becoming the modern "falling" tone. หม ม หน น, ณ หญ ญ หง ง ป ผ พ, ภ บ ฏ, ต ฐ, ถ ท, ธ ฎ, ด จ ฉ ช Sandstone Sandstone

2800-423: The two marks termed mai ek and mai tho ) represent the three tones of Old Thai, and the complex relationship between tone mark and actual tone is due to the various tonal changes since then. Since the tone split, the tones have changed in actual representation to the point that the former relationship between lower and higher tonal variants has been completely obscured. Furthermore, the six tones that resulted after

2856-508: The urban/rural divide, is partly mutually intelligible with Lao , Isan , and some fellow Thai topolects . These languages are written with slightly different scripts, but are linguistically similar and effectively form a dialect continuum . Thai language is spoken by over 69 million people (2020). Moreover, most Thais in the northern (Lanna) and the northeastern (Isan) parts of the country today are bilingual speakers of Central Thai and their respective regional dialects because Central Thai

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2912-555: The vast majority of Thai Chinese enclaves throughout the country. It is the sole official language of Thailand . Thai is the most spoken of over 60 languages of Thailand by both number of native and overall speakers. Over half of its vocabulary is derived from or borrowed from Pali , Sanskrit , Mon and Old Khmer . It is a tonal and analytic language . Thai has a complex orthography and system of relational markers . Spoken Thai, depending on standard sociolinguistic factors such as age, gender, class, spatial proximity, and

2968-626: The world in constructing temples, churches, homes and other buildings, and in civil engineering . Although its resistance to weathering varies, sandstone is easy to work. That makes it a common building and paving material, including in asphalt concrete . However, some types that have been used in the past, such as the Collyhurst sandstone used in North West England , have had poor long-term weather resistance, necessitating repair and replacement in older buildings. Because of

3024-453: Was a thorough mixture of Thai and Khmer. There were more Khmer words in use than Tai cognates. Khmer grammatical rules were used actively to coin new disyllabic and polysyllabic words and phrases. Khmer expressions, sayings, and proverbs were expressed in Thai through transference. Thais borrowed both the Royal vocabulary and rules to enlarge the vocabulary from Khmer. The Thais later developed

3080-593: Was declared by royal proclamation in the Thai Government Gazette as the first national park in Thailand. The park was named after the defunct Tambon Khao Yai. Boonsong Lekakul , one of the 20th century's most famous conservationists in Thailand , played a major role in the establishment of the protected area. During the Vietnam War there was a US military Air Defense Radar Station of

3136-491: Was formally recognized by the government and classified as "Tambon Khao Yai" within Pak Phli District , although the nearest mountain named "Khao Yai" was at the other end of the range. Owing to its location and distance from the authorities, the new subdistrict soon became a refuge for criminals and fugitives. After an attempt by government forces to capture the outlaws in the area, the villagers were relocated onto

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