of the basin structure consists of harder rock layers of the Upper Keuper (Ko) Rätkeuper. In the Tertiary it came in the inner basin edges consisting of gypsum Keuper to the dissolution of plaster layers. Through this process, also called subrosion, formed hollows. These were backfilled with the weathering marls from the immediate area. Because of their high clay content, these sediments formed the raw material basis for some brickworks. In the basin itself, loess has deposited in the course of the last ice age and weathered to loess clay. The amount of deposits is up to 150 cm and is responsible for the good to very good quality of arable land. The old Kleinstadt, classified district, covers an area of 99.12 km². The municipality has a maximum extent in east-west direction of about 12½ km and in north-south direction of about 15½ km. The vast majority of the land is used by agriculture, in the area of wet creek lowlands mainly as grassland and pastures. The forest on the surrounding mountains consists of three quarters of deciduous trees, mostly beech, while on the Rätkeuper spruce cultures thrive. In comparison to the NRW state average of 49.4%, the agricultural area in Blomberg is 60%, while the forest area is 25.4% (NRW) and 26.5% (Blomberg). Extensive areas of the Blomberg urban area are good to very good for the use of geothermal heat sources using geothermal probes and heat generated by heat pump. In the central and southern urban area, however, the suitability is rather mediocre, and in some cases poor (see the adjacent map). Neighbouring communities The neighbouring communities are Bad Pyrmont, (in Landkreis Hameln-Pyrmont, Niedersachsen), Lügde, Schieder-Schwalenberg, Horn-Bad Meinberg, Detmold, Lemgo, Dörentrup and Barntrup (all in Kreis Lippe). Villages The Blomberg city area belongs to the maritime climate area of northwest Germany. The winters are usually mild under Atlantic influence, the summers moderately warm and the rainfall relatively evenly distributed. The average annual temperature is around 9 °C. Monthly average varies from around 0 °C in January to 17 °C in July / August. The annual rainfall is around 900 mm. The average annual solar radiation is 955 kilowatt hours per square meter. Notable residents Wilfried Paulsen (1828-1901) was born on Gut Nassengrund near Blomberg. He was a potato breeder and in the last decades of the 19th century he was the market leader for potatoes in Germany Louis