Village
Sargentes de la Lora is a municipality of about 130 inhabitants on the páramo of La Lora (Burgos), 63.5 kilometres north of the provincial capital, bordering the Cantabrian municipality of Valderredible. It brings together several settlements, among them Ayoluengo, where on 6 June 1964 some 6,000 litres of oil gushed out, the first time crude oil was found in Spain; the oil field operated until 2017 and its memory is preserved in the Museo del Petróleo, opened in 2015 and the only one of its kind in the country. Since 2017 the municipality has been part of the Las Loras Geopark, the first Unesco geopark in Castile and León, and its high plain preserves an important gallery grave built with limestone blocks, that of La Cabaña.
Historical milestone
On 6 June 1964 some 6,000 litres of oil sprang from the ground at Valdeajos de la Lora; it was the first commercial crude oil find in Spain and it transformed life on these moorlands for half a century.
Monument
Opened in 2015, it is the only museum in Spain devoted to the oil industry and it tells the story of the Ayoluengo field, the only onshore crude oil operation the country has ever had.
Curiosity
The Ayoluengo oil field, in Sargentes de la Lora, was the only oil field ever commercially worked in Spain, active between 1967 and 2017. The discovery was made on 6 June 1964, when an exploration by the joint venture Amospain-CAMPSA, with Standard Oil of California and Texaco, made a jet of crude oil almost fifty metres high burst out at a depth of 1,348 metres before numerous witnesses. Commercial extraction began on 9 February 1967, with an eleven-kilometre pipeline to Quintanilla Escalada. Production, barely 150 barrels a day and of poor quality due to traces of arsenic and sulphur, was used as industrial fuel in factories in Burgos; today the site is a Bien de Interés Cultural (Spain's highest level of heritage protection), in the ethnological ensemble category.
Nature
The dolmen of La Cabaña stands north-west of Sargentes de la Lora, beside the Navazal stream, and is among the best preserved of the more than thirty dolmens in the Páramos comarca. It is a gallery grave: its chamber, about three metres across, is formed by seven large limestone slabs over two metres high that project above the mound, and it opens to the outside through a five-metre passage to the south-east. The mound, badly worn, reaches sixteen metres at its longest. Inside, the bone remains of at least fourteen people have been found, along with grave goods including microliths, an arrowhead, a scraper and ornamental beads, which date it to around the second half of the fourth millennium BC. Declared a Bien de Interés Cultural (Spain's highest level of heritage protection) in 1993, it is reached along a signposted path.
Monument
A Romanesque church that preserves original features of the nave, plain decoration and a well-worked doorway; the bell tower was raised in 1641, when the village still lived on nothing but pasture and cereal.
Monument
The parish church of the municipal capital, one of six churches shared among the villages of the municipality along with those of Ayoluengo, Ceniceros, San Andrés de Montearados and Valdeajos, deep in the páramo of la Lora. It is a Renaissance church with a single nave and a side chapel, stone star-ribbed arches and a Gothic vault; the doorway is also Renaissance, and the rectangular apse is reinforced with buttresses. The tower, tall and square in plan, has sixteen openings and holds four bells, the oldest cast in 1668 and the most recent in 2023, when the roof was also restored.
Curiosity
Among the municipality's settlements is Ceniceros, deserted today, of which only the Church of San Pedro remains; its emptying illustrates the process that has reduced the whole La Lora moorland to a few dozen residents.
Nature
A limestone platform raised above a thousand metres, with flat horizons, juniper woods and cliffs above the Rudrón; it is the hanging syncline that gives its name to the Las Loras UNESCO Global Geopark.
Historical milestone
In 1141 King Alfonso VII granted lands around Ayoluengo to a monastery, the oldest documentary mention of a moorland that in the 18th century came under the jurisdiction of the Marquis of Aguilar.
Curiosity
Santa Coloma del Rudrón is a hamlet in the municipality of Sargentes de la Lora, at the bottom of the Rudrón valley, which had 11 inhabitants in 2013 and lies 12 kilometres south of the municipal capital. Its residents have always lived off farming the threshing floors that surround it. It preserves a fountain from 1913, a Roman bridge, the Renaissance parish church, with a rococo altarpiece from the second half of the eighteenth century, and old beehives once used to extract honey. Its name recalls Santa Columba, martyred in Córdoba in the year 853, and it lies within the Hoces del Alto Ebro y Rudrón nature reserve.
Curiosity
Two of the villages in the municipality of Sargentes de la Lora keep distinctive dedications: Moradillo del Castillo has its church under the patronage of San Cristóbal, while San Andrés de Montearados, eight kilometres south of the municipal capital, within the Hoces del Alto Ebro y Rudrón nature reserve, gathers in a hamlet of a handful of houses the hermitage of Nuestra Señora de Brañosera and the church of San Andrés. Beside the hermitage runs the Rebollar stream. Both settlements form part of the Romanesque route of the Páramos comarca, along with the churches of Ayoluengo, Ceniceros and Valdeajos.
Nature
The limestones of the moorland, formed on Cretaceous sea beds, hold abundant fossils that crop out in the cliffs and form part of the geological heritage recognised by the Las Loras Geopark.