General Characteristics

County (administration): Hradec Králové Region
District (town): Jičín
Cadastre: Ohařice
Map 1 : 50 000 (sheet No): 0334, 03344
Geological region: Czech Cretaceous Basin - Jizera Cretaceous & Cretaceous of the lower section of Labe River, Ploučnice, Kamenice and the Děčínský Sněžník Mt.
Accessibility: - passable footpath
Technical object: guarry
ID : 4315

Geology

Short characteristics of the site: An abandoned quarry on Houser Hill, which exploited central basanitic feeding dyke of this monogenetic volcano, exposes pyroclastic sequence documenting early evolution of an pyroclastic cone growing in a marshy landscape. The basal phreatomagmatic layer (lapilli-stone) corresponds to initial phreatomagmatic stage as the eruption took place in wet environment. As the volcano grew, magma got insulated from water, and the eruption style turned to Strombolian emitting mainly scoria fragments. At the end, the pyroclastic sequence was penetrated by basanite dyke.
Regional geologic unit: Bohemian Massif - superficial deposits and post-Variscian magmatites - Tertiary - Dispersed Alcalic volcanits
Stratigraphy: kenozoikum - terciér (paleogén - neogén)
Subject: volcanology, geomorphology
Geological phenomenon: dyke, vulcano, cinder cone, volcaniclastic deposits
Genesis: volcanic
Rock: basanite, pyroclastic deposits, scoria, lapillistone

Territorial conservation

Level of protection: Registered geological localities suggested for protection
Protection of a geol. phenomenon: B - Geological phenomenon is the reason for a recommendation to the protection
Part of the Geopark: Bohemian Paradise
Conflicts of interests: vegetation

References

Rapprich, V., Cajz, V., Košťák, M., Pécskay, Z., Řídkošil, T., Raška, P., Radoň, M. (2007). Reconstruction of eroded monogenic Strombolian cones of Miocene age: a case study on character of volcanic activity of the Jicin Volcanic Field (NE Bohemia) and subsequent erosional rates estimation. Journal of Geosciences, 52(3-4), 169-180; Čáp, P., et.al. (2022?): Základní geologická mapa České republiky 1 : 25 000 s Vysvětlivkami 03-344 Sobotka. - Česká geologická služba. Praha.

Elaboration and Updating

Elaborated by: Rapprich Vladislav, 28.04.22

Citation

The database Significant geological localities of the Czech Republic: 4315 [online]. Prague: Czech Geological Survey, 1998 [cit. 2024-05-03]. Available from: http:// lokality.geology.cz/4315.

Location in map: