Lom Krákorka u Devíti Křížů
General Characteristics
County (administration):
Královéhradecký kraj
District (town):
Trutnov
Village:
Havlovice
Cadastre:
Havlovice
Map sheets:
04-33 Náchod, 04-331 Český Kostelec
Accessibility:
entry permit for car necessary
Technical object:
guarry
ID:
100
Geology
Short characteristics of the site:
Active guarry with outcrops of Triassic sediments overlain by Cretaceous sediments. Triassic is classified as the Bohdašín Formation, formed of whitish kaolinitic quartzose sandstones of lacustrine origin. Well preserved sedimentary textures as raindrop imprints, mud cracks and ripple marks. Cretaceous sediments belong to the Korycany Member of the Peruc - Korycany Formation (Cenomanian).
Regional geologic unit:
Bohemian Massif > Upper Carboniferous and Permian > Lugic Late Palaeozoicum (including Triassic deposits) > Intra-Sudetic Basin
Stratigraphy:
Permian, Triassic
Subject:
paleontology, economic geology, sedimentology, stratigraphy
Geological phenomenon:
mudcracks, ripple marks, unconformity, ichnofossil, concretion , lithological boundary, cliff, transgression, bed, bedding, stratotype, characteristic rock
Genesis:
sedimentary, aeolian (wind activity), weathering
Rock:
sandstone, conglomerate
Territorial protection
Level of protection:
Registered geological localities suggested for protection
Conflicts of interests:
open cast mining
References
- Valín F. (1964): Litologie triasu v severovýchodních Čechách. - Věst. Ústř. Úst. geol., 39, 459 - 462. Praha.
- Vejlupek M. (1983): Ke stratigrafické pozici devítikřížských pískovců. - Věst. Ústř. Úst. geol., 58, 57 - 59. Praha.
- Prouza et al. in Mader D. (1985): Aspect of Fluvial Sedimentation in the Lower Triassic Buntsandstein of Europe. - 397 - 410. Springer Verlag. Berlin, Heidelberg, New York, Tokyo.
- Mader D. (ed.) (1990): Paleoecology of the Flora in Buntsandstein and Keuper in the Triassic of Middle Europe. - 936 pp. G. Fischer Varlag. Stuttgard, New York.
- Zajíc J. (1998): The first find of the dinosaurian footprint in the Czech Republic (the Krkonoše Piedmont Basin) and its stratigrafic significance. - J. Czech Geol. Soc., 43, 4, 273 - 275. Praha.
- Mikuláš R. - Prouza V. (1999): The Cretaceous biogenic structures created in Triassic sandstones (Devět Křížů at Červený Kostelec, NE Bohemia, Czech Republic). - Věst. Čes. geol. Úst., 74, 3, 335 - 342. Praha.
- Mikuláš R. et al. (1991): Nález bahenních svitků v pískovcích spodního triasu na lokalitě Devět Křížů (severovýchodní Čechy). -Věst. Ústř. Úst. geol., 66, 4, 247 - 249. Praha.
- Holub V. (1966): Geologické poměry východního Podkrkonoší. - MS Geofond. Praha.
- Prouza V., Tásler R. in Pešek J. et al. (2001): Geologie a ložiska svrchnopaleozoických limnických pánví České republiky. - Český geologický ústav, 243 s. Praha.
- Čech, S. – Prouza, V. – Mikuláš, R. – Souček, M. – Stárková, M. – Rapprich, V. – Gürtlerová, P. (2018): Napříč Broumovským výběžkem. Exkurze České geologické společnosti 44/podzim 2018. 56 s. – Česká geologická společnost, Praha
Elaboration and Updating
Elaborated by:
Vladimír Prouza, 14.01.2003
Updated by:
Prouza Vladimír, 15.05.2003, Prouza Vladimír, 29.09.2009, Prouza Vladimír, 08.10.2009, Gürtlerová Pavla, 07.08.2019
Citation
The database Important geological localities of the Czech Republic: 100 [online]. Prague: Czech Geological Survey, 1998 [cit. 2023-06-16]. Available from: https:// lokality.geology.cz/100.
Location in map:
Assessment
Scientifical assesment:
extraordinary
Educational assesment:
major
Significance:
national
Representativeness:
major
Geological importance:
paleontological type locality, significant study profile, geo-historical value, geo-regional value (mapping), geoturistic value
Excursion locality:
yes
Locality conditions:
no problems
You can send information about a change in the status of the site to lokality@geology.cz
