Borovno
General Characteristics
County (administration):
Plzeňský kraj
District (town):
Plzeň-jih
Village:
Nové Mitrovice, Borovno
Cadastre:
Borovno, Planiny
Map sheets:
22-12 Březnice, 22-121 Mirošov
Accessibility:
access without footpath
ID:
4158
Geology
Short characteristics of the site:
The highest rock near the river consists of solid glassy fine grained spilit, in the upper parts of locality - there are outcrops with noticeable structures of pillow lavas (20 – 30 x 40 cm) with grey to grey-black rims, which are formed by chlorite (result of glass) - the evidence of rapid cooling of lava in contact with seawater. Some parts of rocks are covered with limonited coatings. The rocks are poor in vesicles, only rarely occur exists denser vesiculations. The beds of the spilits consist of lava flows which are tilted at an angle of 22 to 26 ° to the SE. The total thickness of the spilits is estimated at the first tens of meters.
Regional geologic unit:
Bohemian Massif > Bohemicum > Barrandien > Barrandien - Paleozoic > Kralupy - Zbraslav Group
Stratigraphy:
Neoproterozoic
Subject:
volcanology
Geological phenomenon:
rock, river channel
Genesis:
volcanic
Rock:
spilite
Territorial protection
Level of protection:
Registered interesting geological localities
Part of LEPA (Large-size especially protected areas):
Brdy
Part of national geopark:
Barrandien
Conflicts of interests:
without conflicts
References
- Stárková et al.(2019): Vysvětlivky k Základní geologické mapě 1. 25 000 list 22-121 Mirošov
- STÁRKOVÁ, M. – HALODOVÁ, P. – MRÁZOVÁ, Š. (2018): Geneze neoproterozoických silicitů (buližníků) s tzv. stromatolitovými texturami na území Brd. – Zpr. geol. Výzk. 51, 57–62.
Elaboration and Updating
Elaborated by:
Marcela Stárková, 07.08.2019
Updated by:
Citation
The database Important geological localities of the Czech Republic: 4158 [online]. Prague: Czech Geological Survey, 1998 [cit. 2023-06-16]. Available from: https:// lokality.geology.cz/4158.
Location in map:
Assessment
Scientifical assesment:
medium
Educational assesment:
middle
Significance:
regional
Representativeness:
middle
Geological importance:
geo-historical value
Locality conditions:
no problems
You can send information about a change in the status of the site to lokality@geology.cz
