![]() In the onlap of siliciclastics onto the carbonate To this basin increased during lowstands, resulting Where subtidal carbonate mud, siliciclastic Oceanward of theĬarbonate platform was a sediment-starved basin Zone from stable cratonic crust to rapidly The Cordilleran Hingeline, which was a transitional Platform grew to an immense size and spanned Of carbonate-secreting plants and animals. Sediment input through the biological activities The carbonate platform developedīeyond the reach of significant land-derived Wide) intrashelf basin that received landderivedĪs carbonate debris from an oceanward carbonate Sediment was deposited in a large (100s of kilometers Sediments deposited in fluvial, beach and The shoreward areas consisted of siliciclastic Occurred in distinctive belts that surroundedġ960). Position during the Cambrian and sedimentation The North American continent was in an equatorial Mass extinctions will be discussed in some detail The grand cycle boundaries and the associated Which roughly correlates with tropical marineĮxtinctions around the globe. Units marks the position of a grand cycle boundary, Stic couplets that are called grand cycles That ocean water reached the Camp Creek areaīy Middle Cambrian time (~530 Ma). The Sauk Sequence (Sloss, 1963), and it appears The passive margin following the breakup of The initial onlap of the paleo-Pacific ocean onto ![]() units recognizedīasal transgressive sequence above the unconformity In addition, theĬambrian section is very well exposed and includes This is one of theįew easily accessible places in southwest Montanaīetween the basal Cambrian sandstone and theīasement metamorphic rocks. The Dillon area occurs in the Camp Creek drainage One of the more complete Cambrian sections in It also requieres the design and to draw up the conduction line that makes the waterpower viable. It requieres the con- struction site of 107,000 liters aproximately to be equipped with a water storage vol- umen. The shortage of water for human be- ing use in the town of San Jose Truja- pan has as an alternative of solution the harnessing of the spring waters of "Los Aguacates" and "El Laurel", that have a flow big enough to satisfy the require- ment because they produce 81,302 liters a day and people in the town consume 24,000 liters a day. También se requiere del diseño y trazo de una línea de conducción que sea hidráulicamente viable. obras de captación de aproximadamente 107 000 litros de capaci- dad para de esta forma contar con un vo- lumen de almacenamiento. La escazes de agua para consumo hu- mano en la población de San José Trujapan tiene como alternativas de solución la cap- tación de los manantiales "Los Aguacates" y "El Laurel", los cuales proporcionan un caudal suficiente para satisfacer la deman- da, ya que en conjunto producen 81 302.4 litros por día y la demanda de la población es de 24 000 litros por día. 82.76% and 75%of the groundwater samples respectivly in Central and Al-Hawban area containing fluoride concentration that exceed the WHO drinking water guidelines value of 1.5 mg/l.The sewage and other wastes are the main anthropogenic source of water contamination with natural contamination by the water_rock interaction in the studied areas, the exacerbates of the problems are the lack of proper treatment of the areas sewage, the lack of good drainage system. The results of the analyzed parameters formed the attributedatabase for geographical information system (GIS) analysisand final output maps.Fluoride average concentration ranges from 0.85 mg / L as a minimum value in the samples taken from Dabab to 2.83 mg / l as a maximum value of the samples taken from Central region. area, which included samples of all types of aquifers. 93 wells based on the inventory of wells in the study. The present study tries to study the source of fluoride in grounwater of the affected areas through an analytical studyof three areas in the southern part of the upper valley rasyan, governorate of Taizin Yemen. More areas are being affected by fluorosis in different parts of the country. Fluorosis continues to be an endemic problem in Yemen.
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