Opatřilka - Červený lom, Natural monument in Prague, Czech Republic

Opatřilka - Červený lom is a former natural monument of 8.2028 hectares in Prague's Hlubočepy and Jinonice districts, at the end of the Dalejský potok valley. Its main feature is the Červený lom quarry, where a steep rock face shows reddish-brown limestone rich in iron oxides beside a broad grey-blue slab, with scree at the base and trees along the top edge.

Limestone quarrying began in the early 1800s to supply building materials for local settlements and continued through the 1940s. This extraction activity permanently shaped the landscape and created the current rock formations.

The green marked trail and the educational path through the Dalejský potok valley both pass the site, and Červený lom is one of their stops. The northern slopes untouched by quarrying were kept open by grazing, and the warm grasslands are still maintained by mowing and trampling.

The site lies at the end of the Dalejský potok valley on the left bank of the stream, in the Hlubočepy and Jinonice districts. A green-marked hiking trail and the educational path Údolím Dalejského potoka pass through it, and Červený lom is one of their stops. The terrain is steep and rocky in places, with loose scree at the foot of the faces.

The cliff faces contain fossil remains from multiple geological time periods that have long fascinated scientists. These fossil deposits make the site special for anyone interested in paleontology and ancient life.