Odkryv v Kravařích National Nature Monument

The Odkryv v Kravařích NNM covers an abandoned sand and gravel pit around 1.25km north-north-east of the centre of the town of Kravaře in the Moravskoslezský kraj – Moravian-Silesian Region. The protected area covers an area of 1.64ha and lies on the left bank of the Chlebíčovský potok Stream. The exposure is between 16 and 20 metres in height and lies at elevations of 254-275 metres above sea level.
 
This unique geological profile of sediments of the continental glaciation has been protected since 1966 and is now included in the category of national nature monuments.
 
The locality is protected as the „Exposure in Kravaře” although the lower and middle parts of the outcrop are currently talus-covered and the locality is gradually becoming overgrown with grasses and various tree species.
 
The basement under this outcrop is built of Neogene sediments, which are overlain by a complex of Quaternary sediments up to 60 metres in thickness. The Quaternary strata consist of sediments from the Elsterian glaciation (glacio-fluvial sands and gravels and tills), fluvial sediments (sandy-gravels) in the lower accumulation on the main terrace and of ochre-brown and yellow till from the Saale glaciation within which we can find irregularly scattered pebbles or boulders of rocks of Nordic origin (quartz, northern types of granite, flint and biotite gneisses) as well as rocks of domestic origin (quartz, culm greywackes, orthogneiss and basalt). The most interesting deposition conditions were uncovered in the northern wall of the sandpit (Pictures 1, 2, 3, 4). The glacial till contains two large blocks of rust-brown limonitized glaciofluvial sand and gravel, which were torn from their original location and built into the glacial moraine. In the western and central sections of the outcrop the glacial tills lay distinctly on greyish, yellow-brown fine-grained glaciofluvial sandy gravels, which contain transported clay lenses. This part of the outcrop is currently covered and overgrown. At present only a smaller exposure of till from the Saale glaciation at the entrance to the sandpit is visible (Pictures 5,6,7). This glacial till is approximately 4 metres thick, unstratified, with a leaf-like texture, yellow-brown in colour and contains pebbles and boulders. The surface of the terrain which ovelies the till is covered with loess loam from the latest stages of the wiss glacial period.
 
The following minerals and rocks have been found at the Odkryv v Kravařích NNM: epidote, druzes of tiny quartz crystals in hollow flintstones, limonite (concretions, geodes, and fragments), manganese dendrites (on quartzite boulders), and flintstone concretions of up to 5kg in weight and morion or smoky quartz (fragments).
 
The aim of the protected area is to protect this profile which offers the possibility to study a frontal moraine on the south-western edge of the Hlučínská pahorkatina Hilly Lands. The locality is of fundamental importance for the stratigraphy of the central European Quaternary and has also been proposed as a parastratotype for continental glaciation.
 
Management activities at the monument include removal of opportunist trees and shrubs, cutting the grass and uncovering part of the exposure.