According to geologists, the plains of Basil were formed by river sedimentation. The "soil" of the low-lying land of present-day Basil, where Bill resides, can be considered to have originated as a result of the transformation of inorganic matter. This is because the soil of the present Basil upazila is neither red nor orange in color. Sand and gravel are not mixed. A layer of river-borne mud and water can be observed just below the soil of Basil. "On top of this paliz land, the layers of hilly soil that came down from the hills were accumulated over time which gradually formed a cover of mital soil on this paliz plain." 2 There is no high hilly area in present-day Basil. Hatibandha, Jadavpur, Ghazaria Unions in the eastern part of Greater Basil at one time had hilly areas, but since 1976 they are no longer under Basil Upazila. The said unions were included in Sakhipur Upazila in 1976.
The main rivers of Basil are Banshai, Jhenai and Langulia. Most of the major bils of Tangail district are located in Basile. As there are hilly high lands across the north-east of this upazila, the fertile soil of Basil has been formed by the accumulation of the sediments coming down from the hills and river-borne sediments. As this soil has been suitable for rice paddy since ancient times, the local elders believe that there is a connection with the said Shali or Shail rice behind the pronunciation of Basil. Scholars opined that not only Basil but most of the present Tangail area was formed due to the sedimentation carried by the original Brahmaputra and Brahmaputra's branches. Soil scientists have also studied how long ago this sedimentation process began. According to them, "except for the red clay, no traces or evidences have been found before the twelfth century anywhere in the plains of Tangail."3 The Chinese traveler Hien Tsang visited the region in 635 AD and found the southern part of the Alapsing region under water all year round. The hills of present Garbari, Balianpur, Indrajani, Deopara and Chambaltala were considered to be the south-western border of the Alapsing region. There is evidence in the history pages of Tangail that most of the plains of Tangail were under water during the reign of Pathan hero Isha Khan. Geologists say that the region of Kurigram to Pabna Sadar subdivision and Tangail Sadar sub-district from Jamalpur, was once in the belly of the sea. That doesn't seem too far-fetched. Even during the reign of Isha Khan, the region covered much of the forested Tengar land and occasionally the Beel, Howr, Rak and Coom. During that period the water bodies like Bathuli Bill, Maitha Bill, Mahera Bill, Shaldu Bill, Achimtala Bill, Kashil Bill, Ghazaria Bill, Bangulia Bill, Atharchura Bill, Sheal Bill, Baghil Bill, Chakeswar Bill etc. were so deep and wide that they were about the river Yamuna. used to remind Some time ago all those banks were filled or some of them became high and became suitable for cultivation.''4 It can be assumed that long before the period of Isha Khan, the land of Basil was under the river. The matter becomes clear in the work of Professor Mufakhkharul Islam, a historian of Tangail district: "Even two hundred years ago, Madhupur Garh used to leave Gudara Nao from here and cross the submerged area for about 20/25 miles and drop anchor in the ghat of Sirajganj region." 5 Historian Kedarnath Majumdar mentioned: "During the monsoon Bara Baju, Pukharia, Kagmari and Atiya etc., many lands of the parganas are immersed in the Yamuna. As seen in the survey map, Yamuna occupied 41054 acres and 9 poles of land in 1850. This land area is 64.13 square miles.''6 It is believed that the settlement of the Basil plain began after the twelfth century. An earthquake in the late twelfth century changed the course of the rivers. As a result, the newly formed alluvial land in this area gradually began to accumulate. However, about three and a half thousand years ago, human settlement began in the then red soil hill forest area of Basil. A group of people came down from the north-west and eastern highlands of present-day Bangladesh and built a township in the Gangariddhi area. It was they who crossed Pundanagar (Mahasthangarh) in time and "arrived in this region along the Shakanadi Vanm river basin through the Brahmaputra in search of forest resources, fisheries, natural crops and mules."7 They were the first people to settle in the river basin near the slopes of Tangail. built up From time to time, several peoples arrived in this region along the path of these peoples or at their invitation for the need of agriculture and fishery resources. At that time, no permanent abode of any agriculture-based community was built in this region. The amount of arable agricultural land arising from the water would not have been able to meet the annual requirement. So they used to come down from the mountain slopes to grow seasonal crops and after the harvesting work, they would return to the higher land habitat. "As the urban expansion of the plains took place along with the periodical geographical changes and the expansion of the permanent plains, so did the influx of periodic newcomers, lured by the arable fertile soil." Dr. Suniti Kumar Chatterjee has termed this population as a branch of Austrians from Indochina. They were workers and pioneered the use of copper and iron and introduced agriculture in the country. Some have called the population of this region "a hybrid of Negrito, Proto, Australoid and Mongolian races". Another thing is to be noted, all over Basil and Tangail, people based on professions are building different townships. The reason for this is that “it can be assumed that at the initial stage of occupation when the magnitude of the production demand was created or the extent of the product demand occurred.
Planning and Implementation: Cabinet Division, A2I, BCC, DoICT and BASIS